In preparation for the IPSC provincials, I gave my ammunition a good run of chrony yesterday and it was another run of very decieving chrony results.
The load is the following :
Brass : Mixed large primed .45ACP brass (Fed, Win, Rem, Midway, Star, CCI, Military), no Win NT small primed junk.
Bullets : Good ol' Frontiers 230 grains RN
Primer : CCI #300
Powder : 6.7 grains of Hodgdon Longshot.
Now the published load shows a maximum load of 6.8 grains at a velocity of 908fps out of a 5" barrel (which is exactly the barrel length that I got) for a PF of 209. However, I'm having hard time just getting major with a load that's really close of the maximum, I've had results going from 700fps to 740 fps with an average of 718fps, for an average PF of 165. Also, spent brass do not shot any sign of overpressure, primers are still well 'rounded'.
Now I expect the published velocities for a given load to be a tad different from the reality due to many uncontrollable factors (components, gun, etc), but a 200fps difference on a 900 fps load, that's almost a 25% difference.
The load is the following :
Brass : Mixed large primed .45ACP brass (Fed, Win, Rem, Midway, Star, CCI, Military), no Win NT small primed junk.
Bullets : Good ol' Frontiers 230 grains RN
Primer : CCI #300
Powder : 6.7 grains of Hodgdon Longshot.
Now the published load shows a maximum load of 6.8 grains at a velocity of 908fps out of a 5" barrel (which is exactly the barrel length that I got) for a PF of 209. However, I'm having hard time just getting major with a load that's really close of the maximum, I've had results going from 700fps to 740 fps with an average of 718fps, for an average PF of 165. Also, spent brass do not shot any sign of overpressure, primers are still well 'rounded'.
Now I expect the published velocities for a given load to be a tad different from the reality due to many uncontrollable factors (components, gun, etc), but a 200fps difference on a 900 fps load, that's almost a 25% difference.
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