Finally got a chance to try the 62 gr tsx out of the RAR 22/250.
Only loaded six in case I had to pull them,but the first three went into about 3/4 in.
Just tried the lowest load I could find of IMR 4895,seated to the max COL. Should be about 3300 fps,no signs of keyholeing ,so the 10" twist is at least adequate.
Pics later when not on my phone.

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[the member formerly known as fluffy}