That's what I said in post 5...
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It is normal for a bolt to move just a touch more into battery when the trigger is pulled. It looks like it closes a lot but it is really a small amount.
I would just lube that gun up. The slots in the barrel where the slide rides should be greased. That part side loads since there is only one spring and it tends to cock the slide in the opposite side. Grease inside the slide bolt pocket is also essential. Like the M1 rifle, the bolt lug just bangs around in there (the M14 addressed this by putting a roller on the bolt lug) and a liberal gob of grease helps soften and smooth the closing process. Greasing the receiver rails on both sides where the bolt rides help with closing. The manual recommends light weapons oil and that doesn't do much to help a 75 year old piece of machinery.
Jim, I'm not sure how long ago this was, but some person had the same problem and he couldn't get the Bolt to feed properly . He finally gave up and either was going to sell it or he found a older gunsmith that he took it to and he found out that whoever had it before or longer seen the Receiver was kinda out of line because of either by overtightened it while using a Rear Sight Tool trying to remove it or installing it and then it had bent a little. After doing some measuring he did noticed the bottom of the Receiver was out of whack and would not let that Bolt work like it should, but after being fixed it fed perfectly.