Someone on the forum may shoot the RST 2 7/8” in short chambers without any issues. Seems like at one time someone had told me(when I asked a similar question) that RST was coming out with 2 5/8” 10 Gauge shells at some point. You may want to call them. I have been very happy with the 2 7/8” 10 gauge shells(I try not to pay attention to the price) and variety of different 12 gauge shells from RST.
It may just be my opinion, but the Black Powder loads that Buffalo Arms sell seem a bit stout at 3.5 Drams and 1 1/4 oz. their 2 5/8’ shells were at 3 ¾ drams and 1/4oz.. I know the gun was built to take that, but for target shooting I think you could lighten up. I am just getting into loading black powder shells and for 10 Gauge I loaded up shells with 3 Drams and 1 1/8 oz. of shot(I haven’t had a chance to shoot these yet). You may want to look at loading 10 Gauge Brass shells, which you can do with hand tools and without a press. Midway USA has a few good videos on YouTube doing this that are worth watching.
That’s a beautiful gun you have and you’ll be able to shoot it soon.
Jay
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