ksbhati,
There may be a proof mark that will tell you the bore diameter, but frankly, mine is off by quite a bit and even at best, it's likely only "in the ballpark". So, you need to slug this yourself. There are a couple of ways to do this but here is what have done in the past several times.
1. find a big enough hunk of soft lead. That's the hard part.
2. Find a goodly sized chunk of brass, aluminum or copper pipe. 3/8" or so would work. An aluminum arrow might work in a pinch. 1/2" copper water pipe might work best.
3. Poor the pipe full of lead. 6" of 1/2" pip will work. I used something a bit smaller in diameter and about that length.
4. put the lead-filled pipe in the bore.
5. tap the oversized lead slug into the bore to get it to conform to the rifling.
6. Turn the rifle upside down and mildly shake it up and down using the pipe in the bore to tap out the slug - onto carpet so it's undamaged.
You may feel better wrapping the pipe with tape first. I don't think it is at all necessary, but it may make you feel better.
Now, with your slug in hand, you can search for a bullet or ball - though measuring the pitch of the rifling would be helpful.
If a roundball seems reasonable, you may wish to buy a scissor mold from Dixiegunworks.com. They are about $35 and come in 0.05" increments to any size that you can conceive of shooting. And while cheap as all get out, mine casts the best roundball I've ever seen.
As for inspecting the damascus - look for pits for sure, but you may wish to have a competent smith look at it. I would be more concerned about the nipple's fit and any corrosion in that area.
Al, et al. I have shot roundballs in mine but find it regulates with only 40 gr or so of powder. I gotta believe that it could do better than that. I have some samples of a .630" "Rigby bullet" from an NEI mold that I will try. They are quite short and may be ideal for this gun. Gotta find the time to do this however.
Brent
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