Again I use them from those vendors. You get about 2830-50 from 18”. They are consistently getting 100fps more than brass. But they are loading to normal pressure, not 80k. So you are not getting the 300fps + increases. Not a guess. I’ve chronoed it many times.
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They originally said 2931 from 18”. They have changed that down to 2835fps.
Again. Normal pressure (less than 62k) just with about 8% more powder. Loading to the higher pressure with fast powders is the key to unlock the advantages.
My guess is these small companies most can’t handle the risk of loading to the higher pressures.