7SAW

wapiti16b

Sergeant
Belligerents
Mar 16, 2014
640
110
49
New Mexico
For those loading this round what have been your best powders for 175g and up bullets?
Please include all parameters , pressure , temp stability, components used!
Thanks!
 
  • Like
Reactions: Dutch260

wapiti16b

Sergeant
Belligerents
Mar 16, 2014
640
110
49
New Mexico
So I worked up some more loads for the 175 Bergers.
Powders, StaBall6.5, RL 16, H-4350
StaBall was very disappointing, the best velocity I got was 2728 with a SD of 5 and ES of 16 after that pressures were erratic/dangerous

RL 16 was much better! single digit SDs
45.9 grains ES 24, SD 9 and average of 2757 fps

46.1 grains ES 16, SD 6 and average of 2767 fps

46.3 grains ES 10, SD 3.5 and average of 2780 fps

H 4350 / unobtanium! ( burnt my last little bit on this test)

46.4 grains ES 5, SD 2 and average of 2778 fps

46.6 grains ES 18, SD 7 and average of 2788 fps

Both RL 16 and H 4350 showed no adverse pressure signs, test was at 5,000' elevation and 49 degrees F
100 rounds on the barrel so far!
 

mustang-cars

Private
Belligerents
Jul 6, 2017
378
148
49
I’ll be doing some load development with 180gr ELD-M’s in the next couple of weeks. I’ll post my results here.
 

wapiti16b

Sergeant
Belligerents
Mar 16, 2014
640
110
49
New Mexico
Yeah, a lot of powder but easy bolt lift and slightly flattened primers!.
SAW II chamber in a FN PBR massaged by Clayton , hinged floor plate and binder plate removed, I can get 3.0"s coal if needed!
 
  • Like
Reactions: b6graham

wapiti16b

Sergeant
Belligerents
Mar 16, 2014
640
110
49
New Mexico
This is a hunting rifle primarily, McMillan A-3G / 26" Bartlein Marksman contour fluted left twist , gain twist 1n9-to-1n8.25 with Claytons Muzzle brake!
So far the Berger 175 Elites & RL-16 @ 46.3g load is right on the money, matches Bergers drop chart @ 2777 fps/5,000' elevation and the 6" steel @ 836 yards is no problem!
What a difference from my FNH SPR 20" .308, it's almost too easy now!