18 Guage double rifle.

[TWM]

I have an 18 guage Williams & Powell double rifle that I bought 49 years ago. In addition to the rifle barrels, it came with a set of 14 guage shot barrels. The rifle barrels are virtually unused as it had obviously been used exclusively as a shotgun. It has probably been at least 35 years since I last shot the rifle using a .635 round patched ball. I would like to shoot it again and use it for deer hunting instead of my 50 cal Hawkins rifle but cannot remember the powder charge. Has anyone had experience with shooting this type of firearm and if so what charge do you recommend? Alternatively, can anyone point me in the direction where I may be able to find any literature on the subject? Thanks in advance for any help. (PS: At almost 80, it may be coming up for sale in the not too distant future. Anyone have any idea of what it would be worth?)

 

[rich pierce]

Looks like it could shoot a round ball well. I’d start with 80 grains and go up from there; 100 grains tops because of recoil for me.