Kimber rebarrel worth it?

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Makes sense. 6/06 is a lot of powder for 3100 with a 115, but should feed well from the existing mag set-up. H1000 works well with 243AI and heavy bullets as does N165. If you can find it RL25 and RL17 seem to make more velocity. I never tried RL26 but would imagine it would be magic for velocity.

I'm pretty much stuck on h1000 for 243AI. Barrel life is stupid long for something that overbore and the velocity is pretty good. N165 has the same attributes, but is more temp sensitive and higher pressure, making functional issues at the same velocities.

I found similar results in my 243 AI’s with 7828ssc and Retumbo. Both worked really well, as did RL-17. That’s a favorite cartridge of mine, super fun round.