Checking my notes for my 270 Win, I also get around 50 fps velocity increase. Accuracy has been around 1.25 " at 100.
I think you need to fiddle with seating depth.
I bought them more out of curiosity. We don't have any lead prohibited hunting areas here, so it's a moot point. Sierras in the same rifle shoot around half an inch.for five shots.
rob
