Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

7RUM 30" barrel velocity potential?

 
LinkBack Thread Tools Display Modes
  #1  
Old 11-24-2006, 05:57 PM
Platinum Member
 
Join Date: Jul 2004
Location: SW MO
Posts: 1,154
7RUM 30\" barrel velocity potential?

What do you guys think is a reasonable velocity to expect for the 7RUM (sane max load) in a 30" barrel for the 180 gr VLD and the 200 gr ULD? I am thinking 3000 fps or maybe a little more for the 200 gr would be possible. What do you guys think? Also, would the 1 in 8 twist be appropriate for these long bullets?

P.S. I know about the Allen Mags, not trying to duplicate their performance in a lesser cartridge, just considering my options and want some realistic numbers to compare.

Thanks in advance,
Sam
__________________
Lefties are the only ones in their right minds!
(and I ain't talkin' politics!)

NRA Life Member
Reply With Quote
  #2  
Old 11-24-2006, 06:36 PM
Official LRH Sponsor
 
Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,807
Re: 7RUM 30\" barrel velocity potential?

Realistic comfortable loads should get you into the 3050 to 3100 fps range with most barrels. Some will be slightly faster, some slightly slower. That is with the 200 gr ULD RBBT.

When I say comfortable loads I mean you can get 5 firings per case before primer pockets begin to loosen up.

The 7mm RUM is a great round with the heavy 7mm bullets out now.

Twist wise, a 1-8.5 would probably be about perfect. That said, I have a 1-9 6 groove Lilja on my 27" barreled 7mm AM and get 3150 fps and have not had any stability issues. Others have said there were issues with the 200 gr ULD RBBT in a 1-9 twist barrel.

For that reason you may want to go with a slightly faster twist.

Keep in mind, if you want to use the 200 gr ULD RBBT, stay away from wide land rifling designs. The 3 groove barrels are pretty hard on these bullets, a 6 groove seems to be just the ticket to get the most velocity for the money.

Rock barrels has made me a prototype, thin land barrel in their 5R design which I have been testing on my heavy 7mm AM. It has been working perfectly so far with velocities up to just shy of 3300 fps. THis is a 1-8.7 twist so you may want to contact them for the same barrel in perhaps a 1-8 or 1-8.3 as they can make any twist rate you want in 1/3" steps.

Simply put, these big bullets in a long barreled 7mm RUM really turn that chambering into a different beast!!

You would not be unhappy with its performance at long range.

Kirby Allen(50)
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 7RUM 30" barrel velocity potential?
Thread Thread Starter Forum Replies Last Post
need adivce on barrel and ammo for 7RUM chw Rifles, Bullets, Barrels and Ballistics 4 01-26-2011 09:42 PM
Barrel velocity jeffro Reloading 9 12-24-2010 02:21 PM
300 or 7RUM Rem 700 SPS Stainles Heavy Barrel? Good Rifles, Bullets, Barrels and Ballistics 2 10-29-2010 02:49 PM
105grn A-Max Velocity potential wildcat Rifles, Bullets, Barrels and Ballistics 9 08-14-2007 06:19 PM
7RUM velocity? sambo3006 Reloading 10 06-01-2006 05:37 PM

Current Poll
Do you archery hunt for elk?
YES - 31.75%
60 Votes
NO - 52.38%
99 Votes
Not yet, but I plan to. - 15.87%
30 Votes
Total Votes: 189
You may not vote on this poll.

All times are GMT -5. The time now is 09:18 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC