I have this Joseph Lang double rifle in this caliber, 1906 vintage. I slugged the barrels, they are .408.. Rifle is proofed for 60 grains cordite and 400 grain soft nose bullet (engraved on the barrels).
Recently I got hold of some boxes of late production original Kynoch (non-corrosive primer and non-cordite propellant).
Some googling suggest that this ammo is .410.. Is it safe to shoot the ammunition in my .408 barrels..?
Any fired cases in your possession not sized? If so, introduce one of the .410-loaded rounds into the case mouth. If the bullet easily slides in up to the brass of the loaded round, its likely OK to shoot them - If they chamber easily. You should mic. the diameter of a load sound's bullet "just" in front of the case mouth to make sure it is .410" (full dia) or that "test" means nothing.
-------------------- Daryl
"a gun without hammers is like a Spaniel without ears" King George V
The original Kynoch bullets, not the later Woodleigh bullets used by Kynoch, were known for their thin jackets which made them safe to use in the varied bore sizing of many of the early rifles and guns. I wouldn't be concerned about a couple of thou difference in bullet and bore diameter especially so where Kynoch ammo was never loaded hot.
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