Got an excited call a little over a month ago from the son-in-law. He was all pumped about the new Barnes MRX bullet. I bought a box of 185 gr. MRX in .338 WM, read the enclosed instructions, loaded 20 Remington cases with 69 gr. of IMR 3841 and CCI Magnum primers. That's considerably less than max. Since I didn't have the rifle, I used a COAL of 3.270". To my surprise, he got MOA accuracy. Confident with this, when Bullwinkle came into eyeball range a 50 yds., son-in-law put a round through his lungs. The bullet went through a rib and left a perfect cross on the gut side of the rib. Impressive expansion. Never found the spent bullet.
This load needs some more development and I'm nervous about the COAL. I'll get my hands on the rifle as soon as I can and get a better preliminary COAL. In the meantime, has anyone out there come up with a COAL for the MRX in .338 WM?