Free: Contests & Raffles.
Maybe a cheap alternative might be to try one of those Limbsaver doohickeys that go on the barrel. I don't use one, but I seem to recall reading that they do indeed work. Also, using the powder charge that you arrived at for accuracy, take those loads and play with the seating depth and see if you can fine tune it a little more.
You've heard all great advice here. I agree with full float on the barrel, it really helped my .340 Weatherby. I shoot the Barnes TTSX and R21 and they are great. Shoots excellent groups and the bullet is a hammer. Here's my last sight in earlier this year at 200 yards. No complaints here, and my other Weatherby's all shoot this well. Stick with it, the 300 WBY is a great caliber.
how clean are your first two shots ? whetherby dosnt float the barrel on the lightweights ? I free'd mine up and the three and four shot groups improved
I floated my .270 ultra light and it shoots lights out
FWIW: I have a Weatherby Ultra Light in 257 Wby. Out of the box I could not get it to shoot consistently well. The bedding job was, politely speaking, horrible. I free floated it, and accuracy improved but not to a point where I was satisified.I finally gave up and had it rebarreled with a Benchmark barrel. I'm very happy with it now.
sell it and start over if that is an option. there are better platforms to start from like remington or a tikka
I have a 1 lb. of Reloader 21 here on my bench. Mark V stainless stardard barrel 24". Not an Ultra light, but shouldn't matter much. It took 8 different loads to find the sweet one, and I have the bullet just touch the lands. Builds a lot of pressure, but nothing dangerous. Have shoot over a hundred of these loads in the past decada.