I got my bolt and rifle back today. There truly is a night and day difference, the work done by Alex Wheeler is l exceptional. The Remington bolt lift and close now feels a lot like my BAT.
Alex replaced the old FP assembly and made a new bolt shroud, among many other things. The old FP assembly was one of those lightweight ones with an aluminum FP. Alex advised me that those speed lock type assemblies cause issues and won't give you consistent ignition.
Opening and closing feels very smooth and there's no more cock on close.

I told Alex that I was having accuracy issues with this rifle. After I fired 100 rounds to beak my barrel in, my ammo kept speeding up the more I shot it.
I found a load shooting 140 hybrids at 2800 fps using H4350. I cleaned after every range session and the velocity crept up to 2950 fps. I tried to eliminate every variable I could that may have influenced the velocity. Every once in a while I could get good groups, but most of the time I would get horrible groups.
I told Alex about this and he bore scoped the barrel. He found that the rifling extending all the way back to the neck. There was no freebore. Thinking about it now, I should have came to this conclusion a long time ago. I used Alex's method of finding the distance to the lands on this rifle and ended up with the ogive of the bullet all the way into the neck of my case before I found the distance to the lands. I thought there was something wrong with what I was doing, despite being successful with his method in the past.
Alex also found a lot of copper fouling in the barrel in front of the neck. I think my ever increasing velocity was due to the build up of copper in front of the neck and jamming bullets into it.
Alex put a throat in the barrel and hopefully that will solve the problem. It appears that the barrel may be oversized. Thats likely the reason why the throat was never cut by the reamer the original gunsmith used. IIRC, the original gunsmith said he reams the throat 5 ten thousandths larger than whatever the standard land diameter is supposed to be.
I cleaned when I got the rifle back. I always used a nylon brush, but was advised to use a bronze brush as well as Montana Xtreme copper killer for copper and carbon fouling.
If you have never used montana xtreme before, you'll be surprised how strong it is. That stuff will wake the dead lol. I strongly advise against attempting to reproduce for a few days after handling it.
I used Sweets in the past, but this stuff is stronger. I thought I removed all the copper fouling from my barrel before I sent it off, but the Montana Xtreme showed me I was wrong.
I'm hoping this barrel will be accurate. I'll keep this post updated.