Beautiful rifle you have there. I have an Interarms Mark X chambered in 416 Taylor improved I picked up on gunbroker a few years ago. Called C4HD (think that’s the name) and ordered some dies. I use mine on whitetail and have had great luck with it. It has 26” barrel and I have two loads I’ve used mainly. First load is 350 gr Speer mag tip with RL15 at 2610 fps. Second load is 300 gr TSX with IMR 4166 at 2640 fps. Great cartridge that doesn’t give up very much to my 416 rem mag.
