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.375 Cheytac powder selection

GUTS

Private
Minuteman
Mar 23, 2021
19
27
South Dakota
A machinist friend of mine built himself a .375 cheytac bolt gun. I don't know all the specs but I will ask him later today and get a few pictures of the rifle. He has shot it very little but had great results at 1000yds with Retumbo. He told me he only has a few pounds of Retumbo and from what he had read it was the only powder that worked well with the .375. I think he said he is pushing 300+grn bullets at about 3200fps. Does anyone here shoot a .375 cheytac that gets good results from other powders?