I just reached a milestone with the SG 444, 2.700 COL project gun. The 2.700 COL with Beartooths 405 grain bullet, will load, cycle, feed, and eject in the Marlin action!!! ;D To get to this point the modifications to the Marlin action have been extensive, but, the strength of the action has not been compromised in any way. I am waiting for some new reamers to set the throat out a bit to make room for the 405 grain bullet in the new 2.700 COL, and when that job is complete I will be out to the range to start working up loads. My goal is a 405 grain bullet at 2150 fps (4100+ ft lbs), the ballistic equivilant of the 450-400 Nitro Express. If I can meet that goal, and, with the right bullet, this Marlin XLR will be capable of taking any game animal on the planet. I am heading out for deer season shortly, and I am hoping by the time I get back, that the reamers will be waiting for me. I would like to make this a done deal by years end, so hopfully I will have the results by then....only time will tell.