Had Kevin at www.muzzlebrake.com install one for me on my 300 RUM. Beautiful craftsmanship and works like a charm. He also included a thread protector so I can take the brake off for hunting so you won't have the extra noise factor. It is VERY effective for reducing the recoil. Lets face it, a 300 RUM has a pretty good bark anyway, so even without the brake, most guys don't like sitting next to me at the range when I'm shooting the 300, and it's loud enough in the field that I wear protection.Regardless if the folks on this forum like them or not, brakes can be very effective and make a heavy recoil into a *****cat.