The Trappers are 1:20 or 1:24 so work well with heavier longer bullets. I had a Fastfire 1X red dot on it so not the optic for evaluating long range accuracy. I shot poker chips at 100 yards with a few different loads. My plan was to load with hard cast and hand load an FTX from my pocket if I shot longer range at a deer.very nice... what is the twist rate?... you mentioned that it loaded the 300s, did you shoot any?