My 22 250 has a 1/14 twist and 35 grains of IMR 4895 over a 55, 60, 63, or 64 grainers all shoot around 1 inch for 3 shots. The 55 grainers shoot the tighest but the other weights are not far behind. I cannot explain why, but I have had much better luck with IMR 4895 in my rifle than I did with IMR 4064, regardless of the bullet weight.
I use Win Brass, CCI 200 primers, and OAL is 2.395. The 64 grainer is running 3240 fps out of my 20 inch tube
Last edited by Colin_Matchett; 09/21/09. Reason: added more info