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I'm still feeling this rifle out. I fired three shots of 92 gr 7828 without the flash tube and got similar velocities as with it but the three shots were in a perfect 3" horizonal stirng with only a slight vertical dispersion.
I know I'm close when that happens. A grain or so above or below that will shift the spread from horizonal to vertical or vise versa then dropping back maybe a half grain will result in a symetrical group.
I went up a grain. Group was a nice triange about right a 1 MOA and a volicity of around 3100. Still no pressure indicators on the cases. The RSI said about 63000 PSI.
My feelings are that the 250 and maybe the 275 grain bullet is what the 338 RUM was made for.
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On the other hand................she had warts
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