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It is with centerfire rifle pressures - 40K at least, more like 50-60K PSI - that projectile will still be pushed enough to not slow down. Plus that peak PSI curve probably won't drop off enough that it won't be effective enough to keep pushing the projectile effectively vs. friction.Im not surprised at all. I never did believe that longer barrels slowing the bullet down crap. That corked up gas is still high pressure and conce the bullet is deformed in the rifling it isnt that much of a push to get t to move.