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Alpo · 11-29-2011, 05:02 PM

The star-over-PT is a French proof. Smokeless, from 1900. The 70 should be the chamber length, in millimeters, which is 2 1/2 inches, so do not fire modern ammo in it.

You can either buy 2 1/2 inch shells, which, while scarce, are out there, but quite expensive (around 10 to 15 bucks a box) or have the chamber lengthened.

2 3/4" shells will fit in a 2 1/2 inch chamber, and fire, but they won't open enough, so the pressures will skyrocket. Bad juju.

11-29-2011, 05:02 PM	#3
Alpo Advanced Senior Member Join Date: Feb 2007 Location: NW Florida Posts: 8,647	Re: help identify old shotgun The star-over-PT is a French proof. Smokeless, from 1900. The 70 should be the chamber length, in millimeters, which is 2 1/2 inches, so do not fire modern ammo in it. You can either buy 2 1/2 inch shells, which, while scarce, are out there, but quite expensive (around 10 to 15 bucks a box) or have the chamber lengthened. 2 3/4" shells will fit in a 2 1/2 inch chamber, and fire, but they won't open enough, so the pressures will skyrocket. Bad juju. __________________ Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297 I always take precautions. Beware the Evil Bullet Fairies.