Hello everyone, few weeks back I picked up a interarms mark X in this clambering. Also first time reloading for improved cartridge. I've yet to find the max charge yet, but rifle seems to be very promising. So far I've mainly used the speer 350 grain mag tip bullets, and norma 416 taylor brass. Using RL 15 I've worked up to 80.0 grains for 2,620 fps with zero pressure signs. Still maintains easy bolt lift, and no swipe on case head. Do believe I'm going to settle on 2600 fps though. The rifle came with leupold QR bases and a 1.5x4.5 nikon scope. Barrel is 25.5 inches long and has barrel band swivel. Pretty sure the bolt handle is custom, since it looks nothing like my other interarms bolts. Has nice set of single leaf Express sights. Also worked with some 400 DGX with IMR 4320 powder in quality cartridge 416 taylor brass. No issues hitting 2410 fps with no pressure signs. Gun seems to be plenty accurate and well put together.