Tried some T7 Magnum pellets in the rifle yesterday. 150gr total with the 250gr Thor @ 100 yards. Shots 1 and 2 were awesome but shot a couple inches to the right. Made scope adjustment and fired shots 3-4 and 5. On the 5th shot though the crud ring got so bad that i had to jam the range rod down to seat the Thor and i felt a pellet break. It didnt hurt accuracy to bad but that crud ring really sucks rear end.
I went home and cleaned the Optima and went out with 3 of the White Hots for a Magnum load and accuracy was 3 to 3 1/2" with the 250gr Thor and surprisingly, i got a really hard crud ring with the lighter weight Thor. I even dropped it down to 100gr charge and the group opened up to 5" for 3 shots. Not cool but i will see if i can change things with the 777 primers or the cci inline MZL primers. I am going to re-test tomorrow hopefully and see if maybe it was me or just the powder liking the 300gr Thor best.