Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


.257, 6.5mm and 270 Allen Mags, New Family or Rounds...

LinkBack Thread Tools Display Modes
Unread 11-06-2004, 01:15 PM
Official LRH Sponsor
Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,848
Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...


Rl-25 is a good powder and a pretty good match for the 257 Wby with most bullet weights especially the 115 and 120 gr class bullets.

There are slower powders out there though, much slower. This is a good thing as RL-25 is a great powder in the 257 STW with 100 gr bullets but it is really to fast in burn rate for anything much higher to get peak velocities.

In teh 257 STW, Retumbo is a much better powder for bullets in the 115 to 145 gr weight as it will provide better consistancy and higher velocity the Rl-25 because it is a slower burning powder.

In my 257 AM, Rl-25 is very fast for even the 100 gr pills which I do not recommend in this round. I will develope loads for the 100 gr Bonded Core FBHP but velocity spread will be relatively high as it generally is in the STW, just worse in the larger AM.

I recommend startign with the 115 gr bullets as light weight options in the 257 AM and preferably the 130 gr Bonded Core FBHP from Wildcat Bullets.

With this bullet weight Retumbo will be the best powder I suspect along with the 145 gr pill.

There will also be a 150 gr FBHP but testing needs to be done to see if this bullet will stabilize in the 1-10" twist barrel or if it will need a 1-9" twist to keep the bullets on point.

Other powders that will be tested with the 145 adn 150 gr bullets will be H-50BMG(possible powder bridging problems may occur with this powder at the case neck, we will have to see) and AA 8700 which is nearly the same as H-870 which would have been a hell of a powder for this round if it were not dropped from the Hodgdon line.

Only one person I know of is making these weights in the 257 caliber and he is Richard Graves, owner of Wildcat Bullets in Alberta Canada. His bullets have performed to perfection in high velocity testing with the 257 STW and I suspect will perform the same in the larger 257 AM as well.

Good Shooting!!!

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

Reply With Quote

Unread 11-07-2004, 12:53 AM
Silver Member
Join Date: Dec 2003
Location: Dover De.
Posts: 158
Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

I have the 257 Wby mag and I have reloaded all my rounds to: 100gr bullet does 3500fps,
87gr bullet does 3700 fps, 117gr bullet does
3300 fps,and the 120gr bullet does 3200fps.
I use RL25 powder. I don't think there is a slower powder but I could be wrong. I didn't know they made a 130 for the 257.
Reply With Quote


Thread Tools
Display Modes

Similar Threads for: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...
Thread Thread Starter Forum Replies Last Post
Allen Mags cornstalker Rifles, Bullets, Barrels & Ballistics 6 08-25-2008 10:57 PM
New Allen Mags?? goodgrouper Rifles, Bullets, Barrels & Ballistics 11 06-28-2007 09:15 PM
the allen mags paulmoney Reloading 8 12-15-2006 03:02 AM
New addition to the Allen family.... Fiftydriver Rifles, Bullets, Barrels & Ballistics 46 12-08-2006 10:28 PM
Allen Mags? LOBO Equipment Discussions 20 10-27-2005 01:15 PM

All times are GMT -5. The time now is 07:43 AM.

All content ©2010-2015 Long Range Hunting, LLC