Just Jim,
Most shooters use smokeless, just because of the time limits on the matches are not going to let you wipe the bore, but you may be able to use a blow tube. The other reason is recoil. A two day match means 180 to 200 rounds of shooting. At the end of that year I was having floaters in my eye and the Doc said it was a broken blood vessel in the eye from recoil. 500 grain bullets shot a little better at 200 and 300 yards but you pay for it in recoil.
IMR 3031 and IMR4198 are used, as is SR4759 (extinct) and older 5744, don't know about the new 5744's. Guys that I knew who were loading Unique keep them subsonic, so it would be easy to "toast" a barrel with Red Dot.
"Refinishing" the stock is allowed, but not "glass bedding". Nobody ever asked me to take a rifle apart at a match. As long as you do not use oven cleaner or lye to try to take the oil out of the stock, you could use any wood product. My rifle came from the desert here and was very dry, so I used Benite to harden the wood, linseed to bind the fibers and finished the inside with thinned pure tung oil. Outside was raw linseed oil thinned with turpentine. There are some weak places in the stock where the action mates with the receiver.
Anything under 2 MOA is now competitive, over the 120 shot match. Ten years ago it was 2 1/2 MOA. The rifle can do better, but this shooter could not.
Ric