This brake works on anything from the 243 to the 338 Lapua. 45 to 95 gr of powder is covered pretty well by the one and only original muscle brake. This will offer a little more recoil reduction over the mini magnum. The 5/8x24 slabbed model fits muzzle diameters from .685" to .990".
5/8x24 threads
This brake is 1.00" tall by 1.250" wide.