I have a 30 Bellm, a 7mm bench rest necked up and trimmed to 1.4" to be illinois legal. It is a little more than a 300blk, but I do use 150 game kings in it. I get right at 2450 fps out of a 17" barrel in my striker for a deer round. Since switching last year to the 150 I have shot 3 deer with it. Deer were shot between 60-200 yards and all expanded well leaving large exit holes. I would think a Sierra 125gr or nosler 125 bt would be good at the lower velocity. But, I stopped using the 125 bt because it was very explosive on deer I shot at a muzzle velocity of 2650 fps. The 150 may give you more energy though. Might be worth running the numbers on ballistics. Hope this helps. I also found h4198 gave the best velocity and accuracy in my 30 Bellm.
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