I have a benchmark carbon barrel chamberd in 338 Remington ultra mag with a side port Muzzlebrake . It was on a Remington clone action.I rebarreld the rifle at the time because of the brass and ammo Shortage.the barrel has max 50 rounds down the barrel. and shooting Remington 250 gr Factory ammo it shot while under 1/2 moa. Make a offer. I can send you pic if you pm me your number. Also willing to trade for ? Let me know thanks.