I decided that I would completely abandon all 6mms and shoot 6bra. Across the board. My first 6bra is a Brux 7.5 with the Alex Wheeler 104 fb chamber but my reamer is a 272 neck. Then I have my varmint rifle with a Rock Creek 8 twist same chamber. Waiting for my 12 twist Bartlein barrel for my short range action. Lt32 is great so far for light bullets but I'm going to test ar comp and if it continues to perform I am just going to shoot that for a while in all weights. I am so tired of chasing temp changes and Alliant powders are my favorites.