Mossberg 640KD accuracy questions - The Firearms Forum

accident · 02-11-2011, 05:09 PM

I have a Mossberg 640Kd .22WMR Chuckster that I can't seem to get better than 2.5" groups.I've heard the 640 mag with it's AC-KRO-GRUV barrel is capable of better.I'm thinking (hoping) I just haven't found the ammo it likes.I know rimfires can be picky about what there fed.So far I've tried Winchester,Win Super-x,CCI maxi-mags,and m/mag +V.Varying FMJ,HP and different bullet weights.None do too much better than the other.(no 1" groups I'd like).Midway lists a Federal target .22 mag I'd like to try.Has anyone run across this maybe also with the same gun or other?What ammo would you suggest I try?My barrel appears in VGC after cleaning but could there be something with the gun I'm missing?Am I expecting too much out of the gun?Any help or opinions would be appreciated. THANKS Joe

GunHugger · 02-11-2011, 05:37 PM

You said 2.5" groups but you didn't say at what distance.

I have a 640, it's shoots a little better than that at 100 yards but not much better. Around 1.5" @ 100 on average.

I also have a Ruger that shoots about the same.

And I have heard people say their 22Mag rifles shoot much better but it hasn't been my experience with them. One inch at 100 is about the best mine have ever done.

A few things...

Have you given the bore a good cleaning with a brass brush and a good bore cleaner? I'm not talking about a Bore Snake.

I don't clean my rimfires often since they like a fouled bore. But once in a while and always if I buy a used one.

After a good bore cleaning it will take some shooting for them to settle in again.

Scope...is it a quality scope with enough power to shoot a good group?

Are you shooting from a solid bench with a front rest and rear sand bag?

No need to answer those questions here, just in your head.

Here's mine with a 6-18 power scope, and a decent trigger job. That green grass looks better than the rifle about now.

accident · 02-11-2011, 06:17 PM

Thanks GunHugger.The distance is 45yds.My backyard is not quite long enough for 50.I won't answer all the questions but I'm using a adj. front rest on bench.After shooting the Mossberg,I can set it down,pick up my CZ452 and put 5 rds on a 1" dot.They won't all be 1 hole but much better than the Mossberg.Thats a nice one you have.My scope is also a "cheap" scope.I also think the parralax is set at 100yds rather than 5oyds.My trigger is original and leaves a little to be desired.I'm not an expert shot by any means,I guess all these things combined could be reason enough for poor results.What shoots best in your gun and what did the trigger work entail if you don't mind me asking? Joe

Big Shrek · 02-11-2011, 06:27 PM

Trade the mossy for a Marlin XT22 in .22WMR, you should get under 1/2" at that range, and 1" at 100 yards,
if you do your part

GunHugger · 02-11-2011, 08:30 PM

Quote:

Originally Posted by accident

Thanks GunHugger.The distance is 45yds.My backyard is not quite long enough for 50.I won't answer all the questions but I'm using a adj. front rest on bench.After shooting the Mossberg,I can set it down,pick up my CZ452 and put 5 rds on a 1" dot.They won't all be 1 hole but much better than the Mossberg.Thats a nice one you have.My scope is also a "cheap" scope.I also think the parralax is set at 100yds rather than 5oyds.My trigger is original and leaves a little to be desired.I'm not an expert shot by any means,I guess all these things combined could be reason enough for poor results.What shoots best in your gun and what did the trigger work entail if you don't mind me asking? Joe

Scope could be your biggest problem. 100 yard parralax scope shooting at 45 yards requires repeatable cheek weld. What power is it?

And the trigger on the 300 and 600 series of Mossbergs isn't very good as it left the factory.

Mine seems to shoot all that I tried about the same as far as group size, the point of impact changes some.

The trigger...that not easy to explain. It's not your "normal" rimfire trigger setup. But in a nutshell, it requires getting rid of the movement and creep and polishing up mating surfaces. It's a pain and the end results aren't exactly a target trigger, but I did improve mine some.

I posted a disassembly guide for the 640 here. If you need to have a look at that let me know and I'll find the post.

I found it, here's the link.
http://www.thefirearmsforum.com/show...ight=chuckster

GunHugger · 02-11-2011, 08:37 PM

Quote:

Originally Posted by Big Shrek

Trade the mossy for a Marlin XT22 in .22WMR, you should get under 1/2" at that range, and 1" at 100 yards,
if you do your part

The answer isn't always buy a Marlin Big S.

I own my share of Marlin's and I love them too.

But I own a few other brands that will out shoot any of my Marlin's. Two are Mossberg's and one is a Remington.

I wish we lived closer...

JLA · 02-11-2011, 09:10 PM

I had that exact same model about 8 years ago joe. It shot best with Hornady 30 gr Vmax. A close second was Federal win mag 30 gr TNT HP. Would regularly get 1 inch groups at 100 yds, and this was back before I really got serious about shooting and began to hone my skill...

accident · 02-11-2011, 09:25 PM

Thanks GunHugger for responce and excellent link.I like you think that first a decent quality higher power scope (mine is 3x9)or at least proper parallax should be first.The trigger would be next,I'll call my gunsmith as it sounds like more than I should tackle myself.It's too nice a gun to get rid of.Besides,I like the idea of improving an older gun rather than trading for a new one even though i'll end up with more $ in it than it is worth.I looked for a long time before I found this Mossy and I like it.Thanks again GunHugger you've been of great help. Joe

accident · 02-11-2011, 09:29 PM

Thanks JLA too.I've seen those v-max .22wmr advertised.I'm going to order a couple hundred rounds and see how they work in it. Thanks again,Joe

JLA · 02-11-2011, 09:51 PM

PM me your mailbox, I have a few boxes ill give you, I dont even have a .22 mag anymore...

GunHugger · 02-11-2011, 10:01 PM

Darn nice thing to do JLA.

JLA · 02-12-2011, 10:24 PM

^^^ and thats a darn nutty thing to do^^^

dksac2 · 02-13-2011, 01:01 PM

It's a shame, but they don't make a true match ammo for the 22 mag, you just have to try every different one out there and settle for what shoots best.

I agree, the first thing to replace is the scope. One of the best deals and scopes for the money is the Mueller APV. It's around $130. delivered, but is the best scope for the money.
It's a 4 X 14 X 40 AO scope. 1" tube. I have a couple on some 22's that I have and have shot some darn good groups with that scope. It also has a lifetime warrenty. Break it and they just send you a new one.

It's so darn hard to get in the same position every time when the parellex is off. I bet your groups really improve with an AO scope.

The trigger will be a big help also. Have the gunsmith check the barrel crown for damage also. Some are bad from the factory, so get damaged from other things, but a bad crown will hurt groups also.

Gunhugger, nice looking rifle !!!

My Best, John K

02-11-2011, 05:09 PM	#1
accident V.I.P. Member Join Date: Sep 2009 Location: middle GA Posts: 364	Mossberg 640KD accuracy questions I have a Mossberg 640Kd .22WMR Chuckster that I can't seem to get better than 2.5" groups.I've heard the 640 mag with it's AC-KRO-GRUV barrel is capable of better.I'm thinking (hoping) I just haven't found the ammo it likes.I know rimfires can be picky about what there fed.So far I've tried Winchester,Win Super-x,CCI maxi-mags,and m/mag +V.Varying FMJ,HP and different bullet weights.None do too much better than the other.(no 1" groups I'd like).Midway lists a Federal target .22 mag I'd like to try.Has anyone run across this maybe also with the same gun or other?What ammo would you suggest I try?My barrel appears in VGC after cleaning but could there be something with the gun I'm missing?Am I expecting too much out of the gun?Any help or opinions would be appreciated. THANKS Joe __________________ "The strongest reason for the people to retain the Right to keep and bear arms is, as a last resort, to protect themselves against tyranny in Government." Thomas Jefferson -->

02-11-2011, 05:37 PM	#2
GunHugger Advanced Senior Member Join Date: Jul 2007 Location: SW PA Posts: 1,161	Re: Mossberg 640KD accuracy questions You said 2.5" groups but you didn't say at what distance. I have a 640, it's shoots a little better than that at 100 yards but not much better. Around 1.5" @ 100 on average. I also have a Ruger that shoots about the same. And I have heard people say their 22Mag rifles shoot much better but it hasn't been my experience with them. One inch at 100 is about the best mine have ever done. A few things... Have you given the bore a good cleaning with a brass brush and a good bore cleaner? I'm not talking about a Bore Snake. I don't clean my rimfires often since they like a fouled bore. But once in a while and always if I buy a used one. After a good bore cleaning it will take some shooting for them to settle in again. Scope...is it a quality scope with enough power to shoot a good group? Are you shooting from a solid bench with a front rest and rear sand bag? No need to answer those questions here, just in your head. Here's mine with a 6-18 power scope, and a decent trigger job. That green grass looks better than the rifle about now. __________________ . “There will be a revolution in this country!” “I don’t believe people should to be able to own guns.” ~Barack Obama "Stand your ground. Don't fire unless fired upon, but if they mean to have a war let it begin here." ~Captain John Parker, to his Minute Men on Lexington Green, April 19, 1775. Last edited by GunHugger; 02-11-2011 at 05:39 PM..

02-11-2011, 06:17 PM	#3
accident V.I.P. Member Join Date: Sep 2009 Location: middle GA Posts: 364	Re: Mossberg 640KD accuracy questions Thanks GunHugger.The distance is 45yds.My backyard is not quite long enough for 50.I won't answer all the questions but I'm using a adj. front rest on bench.After shooting the Mossberg,I can set it down,pick up my CZ452 and put 5 rds on a 1" dot.They won't all be 1 hole but much better than the Mossberg.Thats a nice one you have.My scope is also a "cheap" scope.I also think the parralax is set at 100yds rather than 5oyds.My trigger is original and leaves a little to be desired.I'm not an expert shot by any means,I guess all these things combined could be reason enough for poor results.What shoots best in your gun and what did the trigger work entail if you don't mind me asking? Joe __________________ "The strongest reason for the people to retain the Right to keep and bear arms is, as a last resort, to protect themselves against tyranny in Government." Thomas Jefferson

02-11-2011, 06:27 PM	#4
Big Shrek Senior Member Join Date: Nov 2009 Location: NorthWest Florida Posts: 923	Re: Mossberg 640KD accuracy questions Trade the mossy for a Marlin XT22 in .22WMR, you should get under 1/2" at that range, and 1" at 100 yards, if you do your part __________________ Marlin Specialist Calico Specialist A gun should be a tool in the hands of a deadly weapon, not a deadly weapon in the hands of a tool.

02-11-2011, 09:10 PM	#7
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,308	Re: Mossberg 640KD accuracy questions I had that exact same model about 8 years ago joe. It shot best with Hornady 30 gr Vmax. A close second was Federal win mag 30 gr TNT HP. Would regularly get 1 inch groups at 100 yds, and this was back before I really got serious about shooting and began to hone my skill... __________________ It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze. The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do. Fact of life: After Monday and Tuesday, even the calendar says WTF!

02-11-2011, 09:25 PM	#8
accident V.I.P. Member Join Date: Sep 2009 Location: middle GA Posts: 364	Re: Mossberg 640KD accuracy questions Thanks GunHugger for responce and excellent link.I like you think that first a decent quality higher power scope (mine is 3x9)or at least proper parallax should be first.The trigger would be next,I'll call my gunsmith as it sounds like more than I should tackle myself.It's too nice a gun to get rid of.Besides,I like the idea of improving an older gun rather than trading for a new one even though i'll end up with more $ in it than it is worth.I looked for a long time before I found this Mossy and I like it.Thanks again GunHugger you've been of great help. Joe __________________ "The strongest reason for the people to retain the Right to keep and bear arms is, as a last resort, to protect themselves against tyranny in Government." Thomas Jefferson

02-11-2011, 09:29 PM	#9
accident V.I.P. Member Join Date: Sep 2009 Location: middle GA Posts: 364	Re: Mossberg 640KD accuracy questions Thanks JLA too.I've seen those v-max .22wmr advertised.I'm going to order a couple hundred rounds and see how they work in it. Thanks again,Joe __________________ "The strongest reason for the people to retain the Right to keep and bear arms is, as a last resort, to protect themselves against tyranny in Government." Thomas Jefferson

02-11-2011, 09:51 PM	#10
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,308	Re: Mossberg 640KD accuracy questions PM me your mailbox, I have a few boxes ill give you, I dont even have a .22 mag anymore... __________________ It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze. The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do. Fact of life: After Monday and Tuesday, even the calendar says WTF!

02-11-2011, 10:01 PM	#11
GunHugger Advanced Senior Member Join Date: Jul 2007 Location: SW PA Posts: 1,161	Re: Mossberg 640KD accuracy questions Darn nice thing to do JLA. __________________ . “There will be a revolution in this country!” “I don’t believe people should to be able to own guns.” ~Barack Obama "Stand your ground. Don't fire unless fired upon, but if they mean to have a war let it begin here." ~Captain John Parker, to his Minute Men on Lexington Green, April 19, 1775.

02-12-2011, 10:24 PM	#12
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,308	Re: Mossberg 640KD accuracy questions ^^^ and thats a darn nutty thing to do^^^ __________________ It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze. The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do. Fact of life: After Monday and Tuesday, even the calendar says WTF!

02-13-2011, 01:01 PM	#13
dksac2 V.I.P. Member Join Date: Jan 2011 Location: Idaho Posts: 106	Re: Mossberg 640KD accuracy questions It's a shame, but they don't make a true match ammo for the 22 mag, you just have to try every different one out there and settle for what shoots best. I agree, the first thing to replace is the scope. One of the best deals and scopes for the money is the Mueller APV. It's around $130. delivered, but is the best scope for the money. It's a 4 X 14 X 40 AO scope. 1" tube. I have a couple on some 22's that I have and have shot some darn good groups with that scope. It also has a lifetime warrenty. Break it and they just send you a new one. It's so darn hard to get in the same position every time when the parellex is off. I bet your groups really improve with an AO scope. The trigger will be a big help also. Have the gunsmith check the barrel crown for damage also. Some are bad from the factory, so get damaged from other things, but a bad crown will hurt groups also. Gunhugger, nice looking rifle !!! My Best, John K Last edited by dksac2; 02-13-2011 at 01:02 PM..