Quote:
Originally Posted by Texas Star
I've been told by ammo co. engineers that they sometimes use lots of powder that are not offered in what they called "cannister grade".
That may explain why BB is able to achieve those high velocities. They may be using powders not available to reloaders. And they may well be at the edge of the SAAMI pressure envelope. Probably only BB knows for sure.
T-Star
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I've been taken to task for suggesting that BB uses duplex or triplex charges but I think that is a valid way to achieve what they have do. With testing labs and very good quality control there's no reason why they can't test and tune each batch of powder to get consistent results. I believe that such a charge could spread/widen the power curve at close to maximum pressure without spiking over max. In other words rather than just an impulse with a peak, there are several impulses over a longer time with peaks just under the maximum pressure.