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Depends on the Thompson. If you mean the Thompson submachine gun, yes, they were made in caliber .45 ACP (and other calibers as well). However, there are other Thompsons. I have a Thompson Center muzzleloading rifle that is .50 caliber.
100-300 USD
I Sold mine for 100 dollars
100-300 USD depending on condition.
$400-$450
No published sn data
$400 - $450 plus $125 for tang sight per one listed on eBay now. Outstanding rifle had one for decades.
the reason there are two numbers on the calibre of your rifle,is that before 1900 it was used to inform the owner of 1;the calibre .38 and two;the amount of blackpowder that the case was loaded with.In this case 55grs.of blackpowder.
Most black powder bores have a twist that is relatively slow. Say 1:36 or 1:50. They were 1:48 twist in 45 and 50 caliber
30/06
try the Kittery trading post
Uses .277 bullets