Kid, I didn't shoot any because I committed to using lever guns this season, but my brother tested a load I had worked up for my grandson. The results I saw have convinced me to join the stunt shooters. I'll be working up loads this spring for a new T3 .223 with 77gr. TMKs and TBBCs. My Abolt has a 1/12 twist so we'll be sticking to the 55gr. Hornady bullets for it. I"m posting a link to the TBBC thread to make it easier.
