I have an 8 1/2 lb 600 overkill. It has a small brake on it, and it depends what load you use on the recoil. At 2100 ft/sec with a 900 grain bullet, it is doable. With 2300 to 2350 ft/sec, it kicks a lot! My smallest lightest big bore is a 6.5 lb custom ultra lite in 500 Jeffery with a 16 1/2" barrel. The Jeffery smacks you pretty good. Both guns were built by Mike Cupiers of Bijou Creek rifles. His website shows the 600 being shot a couple of times using 900 grain bullets at about 2150 ft/sec. On the AR site there are a couple of dozen guys on the forum that own and shoot the 600 overkill. Including the original designer of the 600 overkill cartridge. It is a great cartridge to shoot.