Funny you should ask Matt, If you recall I had asked that question off and on for a year or so and asked anyone here who may have had a Tamer Buttstock and a 45-70 to try a 45-70 shell in the Tamer stock to find out. No luck...My idea was to mate the Tamer stock to my 45/70 barrel with a Survivor storearm forearm and make a nice and handy walking around woods rifle which could carry it's own ammo. Well I finally was able to locate and buy a hard to get Tamer buttstock in .410 without the gun, and guess what, 45/70 shells would not fit, by just a hair. I took off the small ammo carrier and gently placed a spinning drill bit, I used a 31/64" drill bit but a 1/2" may work also, into each hole and now 45/70 shells are a snug fit and it still works just as well for .410 shells. I was speaking with Chaote Machine 2 days ago about getting an older threaded Survivor screw (old = 1/4x28 as opposed to newer thread of 1/4x20 for forearm screws) and spoike to the woman there about my easy conversion. I am calling back on Monday and am going to advise them of the drill size I used. One piece of advice, if you do this adjustment to the Tamer stock, after you remove the shell carrier from the stock and before you drill the holes (just bearing reaming them out really) first loosen the 2 small screws on the face side of the shell holder and remove the small pieces of rubber which actually hold the .410 shells in place after they are inserted into the holder, then replace them after you are done reraming the holes out, otherwise you can damage the small rubber "ears" which protrude out each way from the screw and hold the .410 shells in place by friction. I know from expierence since I did it and ruined one "ear" and have to replace the piece of rubber, another reason for the call to Choate. If they will not sell me a piece I can fabricate one from a piece of inner tube but I would rather have it as from the factory. With just a little work the .410 Tamer buttstock can become a nice compact 45/70 buttstock. I would not shoot to many full house loads through it unless you add a nice Sims slip on recoil pad. I have one that fits fine, it is a size small Sims slip on, but think I will just use my favorite 28.0 grains of 2400 behind a Hornady 350 grain RN or FP bullet when the gun is set up with the Tamer stock. That load shoots very accurately with very little recoil and will easily harvest any deer I might find in Maine, and they grow pretty big up there ....<><....
edited for drill size (31/64") and Sims slip-on recoil pad size (small)....