I got my Shaw in late Aug.
Noticed all that you noted for the most part. I didn't have to heat anything up but did do a little tap with a rubber mallet to get the barrel seated.
My bolt closed extremely tight also. Too tight IMO. I did shoot it as is the first time out but what an extra workout with the bolt closing so tight (200-300rds no change). I contacted Shaw about it and they wanted me to send the rifle in for inspection. A few emails later the Shaw representative, via email, mentioned they have seen this before with some 10/22s since they have noted Rugers tollerances are not as consistent as theirs. Not wanting to send my rifle away since I had a match coming up I did some messing around and came up with a "shim" to adjust how far the barrel seated into the upper. I sent my results and pictures to Shaw and they called it "ingenuinty"... Also noted that my foil shim will not crush and I should be good to go from here on. Thousands of rounds later and no issues what so ever. Extremely happy camper.
I noted that the factory barrel seated into the receiver somewhere around .998 - .999".
The Shaw seated 1.001 - 1.002".
(Cheap calipers...)
I created/used 4 shims which equaled +/- .0035" of HD Reynolds aluminum foil to get the bolt action where I liked it. I found a semi thick shim laying around in the stuff bin that was close enough and used it to trace/cut out foil shims with a razor blade. I started with one shim, assembled, tested, took apart again, went to 2, etc to get where I finally ended up at.
(These shims slip over the barrel before it is seated in the upper.)
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If I do my job and there is no wind I'm closing in on 1/4" groups (maybe a hair closer to .030" than .025") at 50yds with SK Pistol Match. Where I need to be to shoot KYL matches where the smallest target is just a hair over 1/4" in diameter.
But they are not the round to go with beyond 50yds. The group opens up too much. So I use these only for 50yd KYL matches.
For NRL22 matches I'm using SK Standard Plus. Much better grouping at 100yds. (With the factory barrel I preferred SK Standard Plus for KYL matches over SK PM...) I have shot some sub 1/4" sized groups with SK standard plus at 50yds but not as consistent as the SK PM rounds.
These below I was just shooing quick for dope with SK Standard Plus and spent most of my time shooting 75, 100, 125, 150yds etc. My first NRL22 match was targets at 25, 35, 50, 75 and 100yds with some match director extra rounds at 100-200yds. Fun times and not too spendy to do at all.
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I was shooting semi quick on these. Not for groups but dope. All I needed for this outing.
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I haven't dived too deep into the expensive stuff. I have a hard time spending that kind of money for a .22lr round.
What I really need now is someone to get a trigger out... I'd sure like to see something under 1lb for KYL matches.
Tom