Dr. Drew:
I was perusing a box of Gamebore Traditional Game (made in Great Britain) 2 1/2-inch 20 gauge shells today (English 6s, fibre wad) and right on the side of the box it says "These cartridges are suitable for use in: Guns with a chamber length of 2 1/2 (65/67mm) or longer, nitro proofed to a service pressure of 3 tons/sq inch (850 kg/sq cm)". I sorely wish all cartridge makers would list this sort of information for the shells they produce, but no-matter. Is there a "reliable" conversion for tons/sq inch to tensile strength psi? Or....are there some other variables that need to be considered? Just plugging the numbers into an online converter gives me 6000 psi, which is comfortably below my ball-park figure of about an 8,000 psi limit for older guns. I might add that in a 6lb gun, these shells produced some fairly sharp recoil. Nothing terrible, mind you, but comparatively sharper than most of the RST shells I have used.
Last edited by Lloyd3; 03/09/16 03:45 PM.
