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In my 20" tikka I am using hornady brass.
I didnt have any published load data for superperformance but went on another members load.
I started at 55.6 gn in .2 inrcrements to 57.2.
From looking...

My 24 " PRC does just over 3k with 58.1 gn of 2217 140 eldm , my 20" does 2950 with 56.5 of superperformance 143 eldx.
Both rifles speed up after about 150 down the pipe.
With 56.4gn of SP and a...