I have an original DCM acquired M1 that Clint Fowler rebarred with a Kriger heavy SS 1x12 a few years back. Since, I can no longer see the M1's iron sight, as I used to be able to when I was younger, I had a custom SS side mount built by a local smith and attached to rifle so that I can attach a scope using ARMS quick release rings ( I have tried permanent too-same results). I accurized rifle using traditional techniques. Since, I normally use a bolt gun to hunt, it was some time before I really started playing with this rifle (this past spring). What I discovered was that the rifle shoots extremely accurate (sub 1 moa) if I GINGERLY manually feed 150 SMKs (48 grain H4895), one at a time. Groups are at a 2'oclock position of BULL. However, if I allow for the system to feed all eight rounds, the first hole is at the 7'oclock position and the remaining seven rounds are at the 2'oclock position, with the total group 2" to 4" at 200 yds. I tried to get Fowler to reexamine this rifle to determine if mount was moving ( local smith and I cannot identify movement), since he had told me earlier that he had a device to perform this type of test. However, he replied that he was out of business, due to his age. He recommended Fulton Armory. I contacted Clint at Fulton and explained my problem, including that I believed that the mount may be the culprit. Using crimped vs. non-crimped ammo, 168 and 150, and also testing IMR 8208 powder, the results were the same. I shipped the rife and its attached mount to him, along with a check for about 120 bucks to cover inspection and returned shipping (seems reasonable). After examination, Clint indicated that it was difficult for him to determine why my M1 shot the way it did, but due to safety issues, he didn't recommend manually feeding an M1 due to slam fires ( I already knew that). He stated that the gas cylinder was out of specs, tried to sell me a trigger job, and then stated that he could not test the mount or isolate it to be the problem. I ended up spending an additional 150 buck more for a refurbished gas calendar and one fine cleaning job (of the rifle). Has any one experienced this type problem (accuracy). If so, how did you remedy it? This is really weird!