Pressures should be ok. I have used nothing but 1-3/8 Bismuth 2-3/4 shells in my M21 with no problems whatsoever. The only thing that you might want to check out is the fit of the stock to the frame. A steady diet of those shells could cause stock splitting if the wood is not a good tight fit. The wood in older guns tends to shrink a bit which can cause problems. C.G.B.
cdgach, thanks for your reply. Do you have a good source for Bismuth shells? a cursory google search could not find any readily available except at gun broker or auctionarms
No good sources right now, I am still using from a bunch I bought several years ago. I do believe they are being made. I also use Kent Tungsten matrix shells. They both work about as well as lead, they just cost a whole lot more. C.G.B.
Bismuth is reasonably easy to reload, and both Precision reloading and BPI are selling the shot again. A new company is making the shot now available again. The precision load manuals use old lead shot wads, so that tells you something about its hardness.
If you are talking about a "modern" double (ie post WWII) the shells you have are fine for it in most cases- the problems with nontox shot is in the choke boring and the steel, hevishot, and the newer combos are noncompressable compared to lead. This can lead to a slight bulge right in front of the choke, which with a double can result in the barrel splitting off the rib. Bismuth is much more like lead. I've used it in some of my older guns without trouble.
The new "niceshot" product is also supposed to be OK with older guns, but its harder than bismuth or lead, but I've not used it.
If by an older double, you are talking about a pre WWII gun, or especially a pre WWI gun, I would have an expert gunsmith look at the whole issue before I used anything- some were pretty thin, and some used damascus barrels.
Posts: 11532 | Location: Minnesota USA | Registered: 15 June 2007