Vihtavuori N320 IPSC Loads

Vihtavuori N300 Series

The N300 series powders are single base porous powders suitable for many handgun applications. There are altogether nine handgun powders with different kind of shooting properties and suitable applications. The powder used by the STI Team to reload .40 calibre ammunition is N320. This handgun powder has a comparatively fast burning rate. As well as 9mm and .40 S&W it is useful in many popular cartridges. Currently available data includes .38 Special, .357 Magnum, .44 Magnum, .45ACP and .45 Long Colt.

The overall length of the loaded cartridge is critical to both function correctly through the pistol and to maintain safe pressures. We used both complete metal jacket ( CMJ ) and lead bullets in both calibers. The two different 9mm bullets were loaded to two different lengths and all the .40 S&W loads used the same over all length.

Calibre	Length ( mm )
9mm 125 LRN	28.50
9mm 124 CMJ FP	27.30
.40 S&W	29.50

REMEMBER

If you increase the overall length you will DECREASE the velocity and pressure.

If you decrease the overall length you will INCREASE the velocity and pressure.

CALIBRE	BULLET WEIGHT GRAINS	POWDER MAKE VIHTAVUORI	POWDER WEIGHT GRAINS	VELOCITY IN FPS	IPSC POWER FACTOR
9 mm	125 LRN	VIT 320	3.7	1037	129
9 mm	125 LRN	VIT 320	3.9	1053	131
9 mm	125 LRN	VIT 320	4.1	1072	133

 

CALIBRE	BULLET WEIGHT GRAINS	POWDER MAKE VIHTAVUORI	POWDER WEIGHT GRAINS	VELOCITY IN FPS	IPSC POWER FACTOR
9 mm	124 CMJFP	VIT 302	3.9	1047	130
9 mm	124 CMJFP	VIT 320	4.1	1071	133
9 mm	124 CMJFP	VIT 320	4.3	1093	136

 

Assembled on a Dillon 550B reloading press, Vihtavuori N320 powder is a good choice for 9mm and .40 calibre IPSC loads