Own a couple of the Marlin X heavy barrel rifles, a .308 and a .223. Both shoot well for accuracy. My .308 VH had a problem last couple of inches of bore. LOL, ever seen copper fouling running across the lands.....looked like someone had run a tap down the muzzle. This rifle is one of the early made X rifles done at the Mayfield, Ky plant after Remington folks moved Marlin bolt rifle production there. I will shorten the barrel a couple of inches to around 24". Shoots quite well for accuracy. Altogether I own 4 Marlin X rifles And I've no complaints about there accuracy. X rifle has a decent adjustable trigger. Didn't care much for the stocks on them. They are functional hunting stocks, but I just shoot paper from benchrest. But no problem for me to make a wood stock more suitable for benchrest shooting for them all. Consider their spacing of bolts thru stock to action, better for a wood stock than how Savage does there spacing of bolts. Did have a 25-06 Marlin X rifle, but had it rebarreled to 7x57. Nothing wrong with how the 25-06 shot, just wanted another cartridge.
But, as Biggin08 has written, Remington folks have decided to cease Marlin X rifle production at Mayfield, in favor of making only Remington 783 and 770 rifles there. Darn shame! You'd think they'd have enough intelligence to stop making the POS 770 rifle.