[QUOTE=bronko22000;4300303][QUOTE=sabotloader;4300298]That is kinda odd - since BH is a smokeless
progressive burning powder the should have been a little less recoil in the same charge. BH does not produce the same peak pressure as a T7 load.
That really depends on the weight of the projectile. The heavier the projectile the more efficient BH becomes.
Up to the 250-260 grain projectile the powder shoots nearly the same velocity as does T7 and Swiss BP
This spread sheet shows some of the numbers. The powder loads were all by volume.
The BP seems to have more of a shove while BH is more like the punch of smokeless powder. Velocity may be the same but recoil is different.
You are correct the recoil is different... Real BP and the normal subs burn faster than BH so they reach peak pressure faster and the felt recoil is faster. BH burning progressively is somewhat slower and lengthens the recoil time..
This chart show the 'pressure curves' of various powders... the faster the powder rises to peak then falls off the quicker the recoil might be felt. I know the colored lines are hard to see for corresponding powders but you can see that BH has the longer curve.
On the chart both T7 loose powders create a pressure slightly greater than 25 K while BH just reaches the 25 K line but it occurs slightly later.
