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New .338RUM pack rifle

 
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  #22  
Old 12-07-2010, 08:26 AM
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Posts: 136
Re: New .338RUM pack rifle

Hi Top Shot
Hoping to see the group sizes soon.

I hear she is shooting very well whilst mapping your pressure curves. MMMM I dont think that original crook 7mm barrel will be missed!


Looking forward to seeing the end result once you have it all beded up and a load worked out...velocity looks impressive and is a big improvement over the old 338 win mag.

TB
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  #23  
Old 12-08-2010, 04:54 AM
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Join Date: May 2009
Location: Melbourne Australia
Posts: 136
Re: New .338RUM pack rifle

Well TS you have finally got yourself that "light weight" stalking and long range rifle all in one package you always spoke of and what a lovely outfit it is.
It certainly bridges the gap between your other stalking rifle, a Sako in 338 WinMag and the Edge. This one will easily get you out to 800 yards and I reckon beyond without any worries.
Another one of Geoff Grenfell's builds that is showing a lot of promise early in the piece after only a few rounds through it and it's not even run in.
Looking forward to a long range shoot out with this one against my light weight 338 when it gets built by Geoff.
My ABS carbon fibre wrapped Benchmark barrels will be shipped this coming Friday and hopefully my build will take place in January
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  #24  
Old 12-08-2010, 07:11 PM
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Re: New .338RUM pack rifle

Initial .338 RUM loading results look promising with the 250gn bullet while running in the barrel.
Only shots 2, 3 & 4 were fired as a group but they went into a 1/2" group.
Next I plan to pressure/velocity test Retumbo (AR2225) powder.

Barrel length 26.5"
Hornady 250 grain BTHP match bullet.
H1000 (AR2217) powder, CCI 250M primer, New Remington .338RUM brass.
COAL 3.645" to fit magazine.
Bullet 0.090" off the lands.
New case diameter measured just in front of web .544"

shot # Charge weight, Velocity, fired case diameter.
1 ........90gn H1000 .......2778 fps.......... .547"
2 ........91gn.................. 2800............... .547 "
3 ........92gn.................. 2833............... .547"
4 ........93gn.................. 2861............... .547"
5 ........94gn.................. 2912............... .5475"
6 ........95gn.................. 2941............... .5475"
7 ........96gn.................. 2987............... .548"
8 ........97gn.................. 3044............... .548"
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Last edited by Topshot; 12-08-2010 at 07:30 PM.
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  #25  
Old 12-10-2010, 06:33 AM
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Re: New .338RUM pack rifle

I tried Retumbo today with the 250 grain Hornady BTHP bullet and got the following results.

I didn't bother to go below 95 grains as the velocity was just not there. Did not try above 97 grains as I could not fit any more powder into the case and still stay within magazine length.

95gn, Velocity 2868 fps, case head diameter .547" compressed load.
96gn, Velocity 2925 fps, case head diameter .5475" compressed load.
97gn, Velocity 2958 fps, case head diameter .548" compressed load.

Some observations are that it takes about 2 grains more of Retumbo to acheive the same velocity as H1000. Recoil seems heavier with Retumbo. Can get higher velocity with H1000.

Next I will test for accuracy with a couple of loads in the 2920 fps to 2950 fps range. ................Stay tuned
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Last edited by Topshot; 12-10-2010 at 07:35 AM.
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  #26  
Old 12-10-2010, 06:52 AM
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Join Date: Jan 2009
Posts: 136
Re: New .338RUM pack rifle

MMMM I wonder who aligned the planets on this one! Just kidding!
Quality is there.

My old magnum mag box may help you!
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  #27  
Old 12-10-2010, 01:58 PM
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Join Date: Jun 2010
Location: Bakersfield, Ca
Posts: 554
Re: New .338RUM pack rifle

Retumbo is quite slow for a .338 RUM which isnt as overbore as say the .300rum. You might give RL25 a try if you get a chance.
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  #28  
Old 12-10-2010, 05:18 PM
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Join Date: Jan 2009
Posts: 136
Re: New .338RUM pack rifle

Agree RE 25 works well, great speeds.
I used it a lot in the 300weatherby with 210 Bergers.

The issue is in summer is its very hot and in a warm chamber I've seen velocity spike right up on the chrony.

Retumbo and H1000 are made right here and always available to us down under. Top shot also has an Edge so he uses a bit of H1000 (ADI2217) !
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