Case prep question - The Firearms Forum

Infidel762 · 03-05-2012, 10:45 PM

For bottleneck rifle case prep who here does not chamfer/debur? I have seen several videos lately of ppl prepping 223 and they will re-size, trim, then just tumble. I have been prepping on my RCBS case prep station (also where I rigged up my lee case trim tool) and get the feeling not many do this. I don't "prep" any of my pistol brass other than clean it (maybe) and re-size it and was wondering if doming something similar for rifle would affect anything like seating bullets or getting snagged in chamber.

Hedge · 03-05-2012, 11:08 PM

Chamfering the necks is a good practice. Especially if you're seating flat based bullets. It makes a difference. They seat easier and there's less risk of crushing or deforming the neck.

bntyhntr6975 · 03-06-2012, 01:25 AM

I go the extra steps on all my rifle cases, trim, de-bur inside and out, uniform the primer pocket, de-bur the flash hole. I'm not quite so picky on pistol cases tho. Maybe a waste of time to most people, but it's my time, and I like the final results.

LDBennett · 03-06-2012, 06:56 AM

If you do not de-burr the cases after trimming the burr will catch on flat based bullets during seating and collapse the throat of the case. Some times the outside burr from trimming is so sharp as to cut your hands from just handling the cases. Whenever I trim I follow it with de-burring both outside and inside the case throat. I also use the steel brush on my motorized RCBS prep-station to clean out the primer pockets and the nylon brush to brush out the inside of the throat of the case. I only do these later steps during trimming. If a lot of cases does not need trimming then they don't get the primer pockets or the throat necks cleaned.

LDBennett

Shedhorn · 03-06-2012, 09:45 PM

These guys are right on. If you trim, you need to chamfer and debur.

BD1023 · 03-10-2012, 10:05 AM

Maybe they were using a 3 way head that trims,deburs and chamfers all at once.

gdmoody · 03-10-2012, 11:06 AM

Quote:

Originally Posted by BD1023

Maybe they were using a 3 way head that trims,deburs and chamfers all at once.

I don't know of any such "head" myself. Lyman has one that deburs and chamfers at the same time. I do it in three separate steps.

steve4102 · 03-10-2012, 11:40 AM

Quote:

Originally Posted by gdmoody

I don't know of any such "head" myself. Lyman has one that deburs and chamfers at the same time. I do it in three separate steps.

RCBS Three-Way Cutter, best thing since sliced bread.

http://www.midwayusa.com/product/145...ter-22-caliber

mikld · 03-10-2012, 02:17 PM

If your methods are working for you, if you don't crush cases when bullet seating (I don't), then continue. I was a machinist for several years and it's natural for me to debur any cutting I do on metal, brass trimming included (the cut isn't complete until it's debured)...

BD1023 · 03-10-2012, 03:21 PM

Quote:

Originally Posted by steve4102

RCBS Three-Way Cutter, best thing since sliced bread.

http://www.midwayusa.com/product/145...ter-22-caliber

Forster makes one as well:

http://www.forsterproducts.com/catal...?prodid=700216

JLA · 03-10-2012, 06:11 PM

Inside/outside chamfer is a must for accurate ammo. Seating a bullet into a sharp case will shave bullet jacket and can cause accuracy issues. Its why benchrest shooters use a specialized chamfer tool with a very low angled cutter so the bullet starts into the case without any bullet jacket distortion.

03-05-2012, 10:45 PM	#1
Infidel762 Member Join Date: Mar 2011 Location: Texas Posts: 33	Case prep question For bottleneck rifle case prep who here does not chamfer/debur? I have seen several videos lately of ppl prepping 223 and they will re-size, trim, then just tumble. I have been prepping on my RCBS case prep station (also where I rigged up my lee case trim tool) and get the feeling not many do this. I don't "prep" any of my pistol brass other than clean it (maybe) and re-size it and was wondering if doming something similar for rifle would affect anything like seating bullets or getting snagged in chamber. __________________ -JG NRA Life Member "Democracy and socialism have nothing in common but one word, equality. But notice the difference: while democracy seeks equality in liberty, socialism seeks equality in restraint and servitude" -Alexis de Tocqueville -->

03-05-2012, 11:08 PM	#2
Hedge V.I.P. Member Join Date: Mar 2011 Posts: 63	Re: Case prep question Chamfering the necks is a good practice. Especially if you're seating flat based bullets. It makes a difference. They seat easier and there's less risk of crushing or deforming the neck.

03-06-2012, 01:25 AM	#3
bntyhntr6975 V.I.P. Member Join Date: May 2009 Location: Wichita, Ks. Posts: 254	Re: Case prep question I go the extra steps on all my rifle cases, trim, de-bur inside and out, uniform the primer pocket, de-bur the flash hole. I'm not quite so picky on pistol cases tho. Maybe a waste of time to most people, but it's my time, and I like the final results. __________________ There is a fine line between paranoid and prepared.

03-06-2012, 06:56 AM	#4
LDBennett Advanced Senior Member Join Date: Dec 2003 Location: Hesperia, CA Posts: 5,710	Re: Case prep question If you do not de-burr the cases after trimming the burr will catch on flat based bullets during seating and collapse the throat of the case. Some times the outside burr from trimming is so sharp as to cut your hands from just handling the cases. Whenever I trim I follow it with de-burring both outside and inside the case throat. I also use the steel brush on my motorized RCBS prep-station to clean out the primer pockets and the nylon brush to brush out the inside of the throat of the case. I only do these later steps during trimming. If a lot of cases does not need trimming then they don't get the primer pockets or the throat necks cleaned. LDBennett

03-06-2012, 09:45 PM	#5
Shedhorn V.I.P. Member Join Date: Feb 2012 Location: NW Montana Posts: 53	Re: Case prep question These guys are right on. If you trim, you need to chamfer and debur.

03-10-2012, 10:05 AM	#6
BD1023 Member Join Date: Feb 2012 Location: SW,Va Posts: 18	Re: Case prep question Maybe they were using a 3 way head that trims,deburs and chamfers all at once.

03-10-2012, 02:17 PM	#9
mikld Senior Member Join Date: Jun 2009 Location: Oregon Posts: 573	Re: Case prep question If your methods are working for you, if you don't crush cases when bullet seating (I don't), then continue. I was a machinist for several years and it's natural for me to debur any cutting I do on metal, brass trimming included (the cut isn't complete until it's debured)... __________________ My Anchor is holding fast.

03-10-2012, 06:11 PM	#11
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,298	Re: Case prep question Inside/outside chamfer is a must for accurate ammo. Seating a bullet into a sharp case will shave bullet jacket and can cause accuracy issues. Its why benchrest shooters use a specialized chamfer tool with a very low angled cutter so the bullet starts into the case without any bullet jacket distortion. __________________ 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!