Re: what long range cartridge would work best for a remington short action
+1 for the 7.5 twist for 115s. I have not had good experiances with 8T barrels and 115s even with 6x284. Do not plan on shooting the bergers. I have lost 3 or 4 f-class matches due to vanishing 115gr berger bullets. I have not tried the JLKs but the DTACs work well.
I admit that I know just enough to be dangerous.....but dangerous at ever extending distances.