Chamber pressures for 12 Gauge VH

[Bruce Day]

Pete, I don't know, but makers of proof loads do. They make proof load cartridges for shotgun makers and also for industrial guns to blast out slag from furnaces. I assume that wadding is not an issue and there is likely just a thin spacer between the shot and powder. I have seen proof loads but never taken one apart.

[Researcher]

Bruce what is the date of the Parker Service and Proof load table in the TPS? If I recall correctly it lists pressures for both 3" 12ga and 20ga guns/shells which suggests to me it applies to guns made in the mid to late 1920's and forward.

Paper Shotshell Lengths

In reviewing old Union Metallic Cartridge Co. catalogues and price lists, the first time I see mention of paper shotshell lengths is in 1895 where they offer 10-gauge shells in 2 5/8 and 2 7/8 inch lengths, 12-gauge shells in 2 5/8 or 2 3/4 inch lengths, while 16-gauge is just 2 9/16 inch and 20-gauge just 2 1/2 inch. In the September 1896 catalogue they offer 12-gauge paper "Smokeless" shell in lengths up to 3-inch. All brass 10- and 12-gauge NPEs were offered up to 3 1/4 inch length. By the April 1899 UMC Catalogue things are really taking off and they've added 2 3/4 and 2 7/8 inch lengths to both 16- and 20-gauge offerings, and the 3 1/4 inch 12-gauge length in their "Trap" shell. By the May 1900 UMC catalogue the 3-inch 16- and 20-gauge length is being offered in their salmon colored "Smokeless" shell and their green colored "Trap" shell.

That pretty much covers paper shotshell lengths and when they appeared. So, by 1900 we had paper 12-gauge shells in 2 5/8, 2 3/4, 2 7/8, 3 and 3 1/4 inch lengths; 16-gauge shells in 2 9/16, 2 3/4, 2 7/8 and 3-inch lengths; and 20-gauge shells in 2 1/2, 2 3/4, 2 7/8 and 3-inch lengths.

From the 1890s into the early 1920s, these longer shotshells didn't carry a heavier payload than one could get in a 2 3/4 inch 12-gauge shell, just more/better wadding, which many serious Pigeon shooters believed to be an advantage. The maximum smokeless powder loads offered in the 2 5/8 inch 12-gauge shell and the 2 1/2 inch 20-gauge shell were a bit lighter than those offered in 2 3/4 inch and longer shells.

In that my interest has been smokeless powder shotgun shells and guns, the above has been my canned response for a while. Recently I've noted longer shells offered in an 1889 catalogue when all that were offered were black powder shells and NPEs.