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Sorry, I should have mentioned this, I was not implying to use Retumbo in your .257 merely stating in my 300 Ultra--I had to switch from RL-22 to Retumbo to get tight groups with the A-frames..
No problem, I didn't think you were. It might be a good idea to try Retumbo though, Hodgdon has load data for it for both the 243 and 25-06 with the heavy bullets so it should work in the 257.
I have not had the rifle long enough to work my way up to high velocity loads yet. I've basically just finished fire forming a bunch of cases and am now getting started with real loads.
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