In my .308 I am shooting one hole groups using varget and berger 155gr vld's. When I started 260 development I thought hmmm maybe varget will do the same. Then after searching for a start I found that it was predominately H4831 and H4350. I'm sure somebody here has the proper explanation, but the only thing I could deduce was that because of the smaller neck diameter there would be too much pressure before you reach ideal velocities?
Taking the advice of others I started development with H4831 and got completely discouraged. Could this be the savage that doesnt live up to its predecessors? I couldn't get a sub moa group to save my life. I switched to H4350 and wow, what a difference. It's a mild load of 42gr of H4350 with 140gr Berger VLD's but it is a nice ragged hole at 2748fps.