Making a Traditions Kentucky into a smooth bore?

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The breechplug is threaded in then the hole for the drum is drilled crossways into the breechplug’s chamber area and the drum threaded through locking all the parts together. There’s cutaway pictures of it on here you could probably use search and find them.

And then after the drum is installed, a long drill is used to drill the chamber area which goes through both the plug and the drum.
CVA-BREECH-web-01.jpg
 
If it’s 7/8” then I believe it can be taken out to 28 ga as I’ve been told my 15/16” can go out to 24.

I’ve been contemplating the same thing with my Lyman (.520”, .550”/28 ga, or 24 ga). and there are a few people who have found success loading 28 ga to the 20 ga service load and so I’ve wondered about turkey as well. Ultimately I feel 28 ga is likely the best option in mine and your case in that it allows you to open the possibility of PRBs to try, but also gives modern component options if testing doesn’t give you the results you’re after.
 
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