I knew one guys who had the 30-378, said it was the loudest hardest kicking gun he ever owned.

Mossy, I have read the same things you have about going below 180... None the less I thought I would give is a shot. Loaded last night 150's with 92-94-96 grains of Rx22 seated to 3.601. I figured Retumbo might be to slow for this light of bullet. Plus I don't recall my Lyman book even putting Retumbo down for 150's.

Have any of you tried Retumbo? I see a lot of you use Rx25 or H-1000.