Loading 7.5x55swiss
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Steve in PA
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Personally, I use IMR-4350 when reloading my K-31, 46.0gr with Hornady 165gr SP bullets.
d'Artagnan
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45.0gr IMR4895 with a 168gr Sierra HPBT works best in all three of my Schmidt-Rubins, and is just a hand-full of fps from Swiss military ammo (GP11).
I conducted some load development for the 7.5 Swiss. AA4350 gave excellent accuracy and just about duplicates Ball velocities with 51.0 grains and a 168 Nosler Match bullet. As you can see 52.0 grains produced velocities over Ball, so I do not recommend that load. It is here for reference.
Instead of AA4350 I am shooting surplus WC852 in the 7.5 Swiss. This is a ball powder, and I purchased my lot from Jeff Barlett at GIBrass.com . It turns out Accurate Arms purchased a 90,000 pound lot of WC852, faster burning than Jeff’s lot, and now it is labeled as 2700. My lot of WC852 shoots extremely well, was dirt cheap, and I am using that up. But if I did not have the surplus powder, I would give IMR4350 or AA4350 a go as it shot very well.
7.5 x 55 Swiss Model K-31
AP11 Swiss Ball headstamp DA 78
24 Mar 04 T = 70 ° F
Ave Vel =2565
Std Dev =11
ES = 23
Low = 2551
High = 2574
N= 4
168 gr Nosler Match 51.0 gr AA4350 INDEP brass and primer OAL 2.850
22 Dec 01 T = 58 ° F
Ave Vel =2536
Std Dev =17
ES = 45
Low = 2510
High = 2555
N= 9
168 gr Nosler Match 52.0 gr AA4350 INDEP brass and primer OAL 2.850
22 Dec 01 T = 58 ° F
Ave Vel =2624
Std Dev =31
ES = 72
Low = 2588
High = 2660
N=5
Notice the grease ring on Swiss ammunition. It is there because the Swiss thought it improved accuracy and increased barrel life. The next time some fool tells you that grease on the bullet or on the case pinches the case neck and "dangerously" increases pressures, just show him some greased Swiss ammunition.
Instead of AA4350 I am shooting surplus WC852 in the 7.5 Swiss. This is a ball powder, and I purchased my lot from Jeff Barlett at GIBrass.com . It turns out Accurate Arms purchased a 90,000 pound lot of WC852, faster burning than Jeff’s lot, and now it is labeled as 2700. My lot of WC852 shoots extremely well, was dirt cheap, and I am using that up. But if I did not have the surplus powder, I would give IMR4350 or AA4350 a go as it shot very well.
7.5 x 55 Swiss Model K-31
AP11 Swiss Ball headstamp DA 78
24 Mar 04 T = 70 ° F
Ave Vel =2565
Std Dev =11
ES = 23
Low = 2551
High = 2574
N= 4
168 gr Nosler Match 51.0 gr AA4350 INDEP brass and primer OAL 2.850
22 Dec 01 T = 58 ° F
Ave Vel =2536
Std Dev =17
ES = 45
Low = 2510
High = 2555
N= 9
168 gr Nosler Match 52.0 gr AA4350 INDEP brass and primer OAL 2.850
22 Dec 01 T = 58 ° F
Ave Vel =2624
Std Dev =31
ES = 72
Low = 2588
High = 2660
N=5
Notice the grease ring on Swiss ammunition. It is there because the Swiss thought it improved accuracy and increased barrel life. The next time some fool tells you that grease on the bullet or on the case pinches the case neck and "dangerously" increases pressures, just show him some greased Swiss ammunition.
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