My experience has been that the “use fast burning powders for a short barrel” isn’t really a thing. Certain powders in certain configurations just tend to give better velocities then others and is completely subject to a much larger range of considerations. I think burn rate is more associated to cartridge size and projectile weight with barrel length not really being a consideration. At the end of the day some just go better then others in different setups. Just gotta look at others results and go try. Classic example I have with the fast powder short barrel argument is my 260. It has a 19” barrel and gets the best velocity using Rel 26 which is marketed as a magnum powder due to being right up there for slow burning. Had the guy tell me I was wasting my time when I went to buy the stuff for a 260 as “all the powder will be burning outside the barrel and it will be shit”, boy was he wrong and I enjoyed passing on that it went awesome hahaha.
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