Started messing with reloading 300Hamr for my mini14 rebarreled to 300 blkout rechambered to 300Hamr T20 build. Anyone here reload for 300Hamr? [125-150 gr bullets.] Background, I rebarreled the original mini14 [as I already have a 300 blkout] and i needed a bbl shaped to M1 garand external dimension to work with a M1 stock and gas cylinder. I recently had ASI rechamber it to 300Hamr. Did that to give me a bigger case than the blkout to hold more powder to give me more gas to run the gun. It was running intermittently but with a very weak op rod spring setup and a case full of powder. Obviously with the bigger case I have more pressure as I backed out a primer in yesterday’s testing! Had to back off. Getting good ejection. I’m having to return to the magazine fitment as I believe that is an issue too with the differences in case dimensions. I swapped out my mag release with a polished up one last night. I’ve experimented with a dozen powders, cfeblack and LilGun being the most promising with the 300blkout. My current testing is with LilGun as that was in my measure.