m1903a1 tryout results

[ssgross]

I've posted in some other threads about a recently acquired 1903 with 12/1942 serial number, 5-1942 SA replacement barrel, and wearing a new CMP c-stock. When I got it, the front action screw tip had broken off down in the recoil lug. I got it out, replaced, and went shooting the other day. Here are my results, and issues I identified at the range.
1. after a couple fouling shots to get on paper, I put an SR-1 target black on a regular sheet of paper at 100yds. I put 7/10 shots in the 10 ring, 4x's, 2 in the 9, and one flyer in the white. 10 ring is 3.35", and x ring is 1.35". I shot off a bench with front rest at my indoor range. I used the small peep, and found it difficult to focus on the front sight in the indoor lighting. I can see the aiming black clearly with the larger M1 rear sight, and my 1903a3 sight, but in this case I just tried my best to center on the white page.
2. The milled follower gets stuck at back. After lots of reading here, and measuring against my other m1903, the gap between magazine and receiver is about 0.050 too big. Also, the forearm at the rear barrel band is too fat and clearly noticeable as the barrel band appears stretched when it's on. I conclude the stock was probably on fitted minimally, if at all. Jerro's inletting black is on its way, and I'll be following up with lots of questions for the experts here. Although, I could just see if a thicker stamped A3 follower works, and call it a day since it seems to shoot fine as is. But I'd rather make it better and learn a new skill.
3. Many rounds chambered tight, and 1 not at all...although it chambered fine in my other 1903. These were handloads of mixed brass, full length sized and trimmed to the trim-to length in my Hornady manual. I did a field-expedient headspace check before firing with a live factory round (Hornady match 168) round (no firing pin) as a go-gauge, and added a piece of aluminum tape (0.003 thick) to the end as a no-go. Bolt closed easily on the go, but not on the no go. I inspected with my bore cam and there is some chatter on where the shoulder is cut. everything else is pristine. I suppose I should just rent a pull through reamer and lightly "chase" the chamber? If it's not the shoulder, then maybe the neck isn't long enough? First step is to probably rent or buy a set of real gauges first.
Here are some pics of the throat, shoulder with some what looks life some rough chattering, and the rifling just immediately in front of the throat.
Attachment 110892Attachment 110893Attachment 110894
EDIT: A better picture of the shoulder.
Attachment 110895

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