Quote:
Originally Posted by GIFFROY
I got a good load with :
bullet : H&N (copperised lead) 86 grains HS RN .311
primer : Winchester Small Pistol Standard
case : Winchester trimmed to 21,5 mm
powder : (French) Vectan BA-9 : 5,1 grains
cartridge length : 29,6 mm
I measured the velocity of ten rounds and obtained the following results :
Mean : μ = 363,3 m/s
Maximum dispersion : dm = 18 m/s
Standard deviation σ = 5,1 m/s
No signs of overpressure and good functioning of the weapon.
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Using BA 9, what would you recommend for a copperised 93 gr, .309?
This for 1906 Swiss in excellent condition. Ideally, I 'd be looking for a velocity of 360 m/s (1180 ft/s)