Is it possible, 165 gn @4200 fps.? - The Firearms Forum

Domino300 · 06-10-2012, 01:11 PM

I bought a used Weatherby Vanguard 300 Mag with a couple partial boxes of Wby.ammo. I took it out to sight in with a box of 10 w/ 165 gn. spire points and my Comp.Electronics Chrony. The first 5 shots registered: 4077,4040,3267,4219 and 4232 fps. I thought maybe the chrony was off or they were reloaded with maybe 110 gn bullets, but the primers all had the Wby. green sealer on them. I decided not to continue using them and switched to Wby.180 gn spire points which registered just over/under 3200fps. Also shot some 41 Mags which registered normally. There were no signs of excess pressure on the brass or on extraction. Pulled the other 5 bullets and the pills were 165 gn. The powder measured 87.8 gns in all 5 pulls. So would those speeds be possible with 165 gn bullets?

Hammerslagger · 06-10-2012, 01:41 PM

Sounds too high.

Was your Chrony at least 15 feet from the muzzle? Otherwise, or even so, muzzle blast may have given erroneous readings.

Domino300 · 06-10-2012, 01:54 PM

Chrony was probably 12-15' away.

JLA · 06-10-2012, 04:10 PM

yeah somethins not jivin. BAck the chrony up to 20 or 25 feet. the .300 wby has significant muzzle blast compared to the others.

Domino300 · 06-10-2012, 04:18 PM

OK, thanks for replies. Don't know what powder was in them, but 87.8 gn seems like a lot, but the 4000+ fps would be unreal.

JLA · 06-10-2012, 04:21 PM

87ish is about right for 165 gr .300 wby loads.

Hammerslagger · 06-10-2012, 08:24 PM

I would infer that the bullet is tripping the first sensor. Then the muzzle blast trips it again. Then the bullet trips the second sensor; and you end up with the erratic, too fast readings that you reported.

06-10-2012, 01:11 PM	#1
Domino300 Member Join Date: Jul 2009 Location: NC Ohio Posts: 7	Is it possible, 165 gn @4200 fps.? I bought a used Weatherby Vanguard 300 Mag with a couple partial boxes of Wby.ammo. I took it out to sight in with a box of 10 w/ 165 gn. spire points and my Comp.Electronics Chrony. The first 5 shots registered: 4077,4040,3267,4219 and 4232 fps. I thought maybe the chrony was off or they were reloaded with maybe 110 gn bullets, but the primers all had the Wby. green sealer on them. I decided not to continue using them and switched to Wby.180 gn spire points which registered just over/under 3200fps. Also shot some 41 Mags which registered normally. There were no signs of excess pressure on the brass or on extraction. Pulled the other 5 bullets and the pills were 165 gn. The powder measured 87.8 gns in all 5 pulls. So would those speeds be possible with 165 gn bullets? -->

06-10-2012, 01:41 PM	#2
Hammerslagger Advanced Senior Member Join Date: Jul 2009 Posts: 1,099	Re: Is it possible, 165 gn @4200 fps.? Sounds too high. Was your Chrony at least 15 feet from the muzzle? Otherwise, or even so, muzzle blast may have given erroneous readings.

06-10-2012, 01:54 PM	#3
Domino300 Member Join Date: Jul 2009 Location: NC Ohio Posts: 7	Re: Is it possible, 165 gn @4200 fps.? Chrony was probably 12-15' away.

06-10-2012, 04:10 PM	#4
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,308	Re: Is it possible, 165 gn @4200 fps.? yeah somethins not jivin. BAck the chrony up to 20 or 25 feet. the .300 wby has significant muzzle blast compared to the others. __________________ 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!

06-10-2012, 04:18 PM	#5
Domino300 Member Join Date: Jul 2009 Location: NC Ohio Posts: 7	Re: Is it possible, 165 gn @4200 fps.? OK, thanks for replies. Don't know what powder was in them, but 87.8 gn seems like a lot, but the 4000+ fps would be unreal.

06-10-2012, 04:21 PM	#6
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,308	Re: Is it possible, 165 gn @4200 fps.? 87ish is about right for 165 gr .300 wby loads. __________________ 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!

06-10-2012, 08:24 PM	#7
Hammerslagger Advanced Senior Member Join Date: Jul 2009 Posts: 1,099	Re: Is it possible, 165 gn @4200 fps.? I would infer that the bullet is tripping the first sensor. Then the muzzle blast trips it again. Then the bullet trips the second sensor; and you end up with the erratic, too fast readings that you reported.