@csmiffy you didn't mention what your shooting? Reds, fallow, japs, Thar?
I have had good experience with the 140gr bullets and RL33, 3200-3300 fps easy. You do need to clean regularly as its a fair bit of powder down a small bore and you can get carbon rings like the 28N was prone to.
I have shot the most game with the 140gr SST and have switched to the 143 ELDX but yet to shoot anything larger than a fallow. Ballistically speaking your shooting a long barreled 270 so they can be pretty flat.
I have switched over to 120gr GMX now as they love to go fast and have always worked as advertised. I don't have access to my load data ATM but IIRC I was getting some screaming velocity with AR2217 (3450ish) but backed them off 100 fps as the load was too hot for summer.
In terms of the Sierra GC I find them a bit hard for the lighter stuff which is the majority of what I hunt (fallow, sika, goats).
I'm considering a Howa 6.5 PRC as they look cheap and accurate, but a 6.5 STW might be next when this barrel is gone.
I have 450 shots down the tube and it still holds 1/4 moa from a bench or prone.
Avoid the 147 ELD as they explode before getting to the target.
Here is a red spiker, 375m held dead on with a 1.5" high zero at 100m. 140 SST doing 3150fps, both shoulders top of the heart and double lunged. Bang flop.
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