I have an Accumark in 338-378 and so far love it. I use the factory brake, recoil is more than a .243 but not by much. I have a Night Force 3.5X15X50 mounted and intend to use it for long range shooting. I currently shoot a Nosler 250gr Partition, but am going to try the Nosler 225 gr bonded bullet, it is a boattail. I hand load and am using the maximum load of IMR 7828, with no pressure signs. I am going to start loading the .225s with RETUMBO. I hand load for all my shooting. Four out of five shots were touching at 300 yards, (I pulled one shot). My goal is to hit a 9" target at 800 yards by August. I will be using the brake for all shooting of this gun. And believe me hearing protection is a requirement.