Custom barreled 7 WSM leaves other 7 mags in the dust ?

Ironworker · January 27, 2013, 06:50 PM

Today I chronograph ed my standard loads out of my 7 WSM today I have a Brux 26" SS 9" twist bbl. 69grs of Re#19 behind a Hornady 139gr SST produced an average muzzel velocity of 3550 ! I couldn't believe it ? I then shot my 22 auto pistol through the chronograph and it read 1100 fps and that was what it should've been. Then my 45 auto 890 fps so was that ! So thumbs up for Brux bbls !!!!

**Art Eatman** · January 27, 2013, 10:18 PM

Interesting. The rule of thumb has been that the shorties use 15 or 20 percent less powder than the big brothers, but lose only 10 percent on muzzle velocity.

reynolds357 · January 27, 2013, 11:35 PM

I would question the chronograph. The RUM wont do that at safe pressure. I have a 30" 7WSM 1000 yd rifle that will not even come close to that. Either the Chronograph is wrong or you are running some unreal pressure.

Savage99 · January 27, 2013, 11:44 PM

Two new manuals show 3300 fps for max. loads in the 7mm WSM with 140 gr bullets.

I question your chronograph.

The velocity does not matter all that much to me. I have had chrono's for 50 years.

How does it shoot?

Does it stay sighted in for that first shot?

AllenJ · January 28, 2013, 11:24 AM

Ironworker, congrats on you rifle. What are you going to use it for? I'm having a 7 WSM made using a Lilja barrel, I hope I'm a statisfied as you.

Scorch · January 28, 2013, 01:25 PM

Quote:

Today I chronograph ed my standard loads out of my 7 WSM today I have a Brux 26" SS 9" twist bbl. 69grs of Re#19 behind a Hornady 139gr SST produced an average muzzel velocity of 3550

Quote:

Two new manuals show 3300 fps for max. loads in the 7mm WSM with 140 gr bullets.

My Hornady manual says 3200+ fps with that combination (Hornady manuals are pretty conservative). He's getting 10% additional velocity, that is not unusual or out of the realm of possibility.

How does it shoot?

Ironworker · January 28, 2013, 02:40 PM

I shoot off a sheet of plywood over the bed of my truck using front and rear rest.After a couple of fouling shots Its under MOA I think. Soon as its sighted in I start shooting water filled Rock Star cans and have blown them up at 425 yds. I use to live in SF Bay area and shot at local range off a bench in perfect conditions. I don't have that up here in the Nevada Desert so being able to hit tin cans at 400+ yds is accurate and a good shooter to me.

January 27, 2013, 10:18 PM	#2
Art Eatman Staff Lead Join Date: November 13, 1998 Location: Terlingua, TX, USA Posts: 20,929	Interesting. The rule of thumb has been that the shorties use 15 or 20 percent less powder than the big brothers, but lose only 10 percent on muzzle velocity. __________________ You're from BATFE? Come right in! I use all your fine products!

January 28, 2013, 02:40 PM	#7
Ironworker Member Join Date: March 17, 2007 Location: Reno Nevada Posts: 98	Bench work I shoot off a sheet of plywood over the bed of my truck using front and rear rest.After a couple of fouling shots Its under MOA I think. Soon as its sighted in I start shooting water filled Rock Star cans and have blown them up at 425 yds. I use to live in SF Bay area and shot at local range off a bench in perfect conditions. I don't have that up here in the Nevada Desert so being able to hit tin cans at 400+ yds is accurate and a good shooter to me.

January 27, 2013, 06:50 PM	#1
Ironworker Member Join Date: March 17, 2007 Location: Reno Nevada Posts: 98	Custom barreled 7 WSM leaves other 7 mags in the dust ? Today I chronograph ed my standard loads out of my 7 WSM today I have a Brux 26" SS 9" twist bbl. 69grs of Re#19 behind a Hornady 139gr SST produced an average muzzel velocity of 3550 ! I couldn't believe it ? I then shot my 22 auto pistol through the chronograph and it read 1100 fps and that was what it should've been. Then my 45 auto 890 fps so was that ! So thumbs up for Brux bbls !!!!

January 27, 2013, 11:35 PM	#3
reynolds357 Senior Member Join Date: December 10, 2012 Posts: 843	I would question the chronograph. The RUM wont do that at safe pressure. I have a 30" 7WSM 1000 yd rifle that will not even come close to that. Either the Chronograph is wrong or you are running some unreal pressure.

January 27, 2013, 11:44 PM	#4
Savage99 Senior Member Join Date: May 17, 2004 Posts: 224	Two new manuals show 3300 fps for max. loads in the 7mm WSM with 140 gr bullets. I question your chronograph. The velocity does not matter all that much to me. I have had chrono's for 50 years. How does it shoot? Does it stay sighted in for that first shot?

January 28, 2013, 11:24 AM	#5
AllenJ Senior Member Join Date: December 11, 2009 Location: Northern California Posts: 680	Ironworker, congrats on you rifle. What are you going to use it for? I'm having a 7 WSM made using a Lilja barrel, I hope I'm a statisfied as you.