Thank you, yes I love that rifle but it is a bit large to do much with, I think Cal did a little write up in his book ?
If you want to see some beautiful old rifles ask
@Huvius to post up some of his, he has or had some real fantastic old girls ?
Not saying Glue Gun won't work but I do my own chamber casts & it is very easy even with out Cerrosafe.
All you need is a bit of Sulphur/Sulfur, I have large sacks for making BP but you can get a small bag or jar from your Pharmacist/Chemist store, I get a short length of wire (cut a coat hanger if need be) attach a large ball of cotton wool to the end of that, oil chamber & bore a little, wipe, oil the cotton ball, run into chamber (the cotton ball into the first 1in or so of the rifling) hold in the middle & pour the heated/melted sulphur into the chamber.
Heat on your camping stove out side as it smells up the house & if you have a wife she will get mad, me I heat on the stove cause I don't care lol
Then just withdraw the wire, cotton ball with the cast attached, it is close enough for field work & if you want it to look a bit cooler & maybe a little slippery, you can add a small amount of graphite powder.
I have a rough one here I made of a 12 Bore rifle so lots of product & I was in a hurry, have had some very nice ones but couldn't put my hands on one right now.