Re: .300 RUM muzzle break???
No offense to guys who like brakes, but I wont use one, at least not on my gun. There are a few ways to get around recoil. Good recoil pads, slip on pads and mercury reducers. My technique is to use a slip on recoil pad for bench shooting which is what I did with my 300 WSM. I could shoot it all day. And in the field I could take the pad off or leave it on. I never feel recoil in hunting situations.
I jusy bought a used Sendero 300 RUM and haven't fired it yet. But the previous owner said it was very pleasant to shoot, less kick than his 300 WM or 7mm RM. The Sendero weighs about 8 1/2 lbs and with base, rings and NF will weigh about 11 lbs. IMO, about the perfect carry LR rifle.
Reasons I dont like brakes, they add to length, and I like to keep the length as short as practically possible for carry rifles. They make a lot of noise. They cost $$$.
This is in no way a critique or slam of those guys who do like brakes. This is just my personal preference. Brakes obviously do have their advantages. So before getting a brake, think about it and I would also recommend shooting your rifle first without one to see just how hard it kicks.