It took me a couple years to figure out how to shoot 99s off a bench. I almost sold a 250-3000 because it patterned instead of grouped; went from about 5 inches to 0.75 inches at 100 between load development and learning how to shoot it. Like my shooting mentor told me, "sometimes it's the loose nut behind the trigger"...

I forgot to mention - thanks for the towel suggestion. I'd read it in one of your posts (or articles?) some years back, and have used it successfully on other hard cases.