I tried the Staball 6.5 in our 6.5CM and we weren’t impressed at all. We shot over 120 rounds with 4 different bullets, 5 different charge weights, and 3 different seating depth; and none of the groups held a candle to either H4350 or RL-16Staball is a little slower than 760 , is it more or less bulky than 760. I am nearly filling the case with 760 and I don't like to compress loads, but would like to try Staball.