doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com 70 mm ammo in 67 mm chambers?

Rocketman,

Nearly all the shotshells I shoot are of correct length for the chambers, are light loads, usually 24 grams, and have chamber pressures below CIP limits. My question is not about loads to be used in high volume shooting, as in trap, skeet, sporting clays. It is about occasional use of USA factory loads for hunting, in 70 mm hulls, 28 gram loads mostly, with Federal and Winchester being the most likely. This could happen on trips far from home. With Fiocchi I am OK, but, I never see them in stores where I might need them. Remington black hulled 28 gram ammo is also OK in the gun in question but seldom seen in stores. For these four shotshells we have some pressure data via the 16-gauge low pressure loading group. So, it really is about 67 vs 70 mm hulls with Federal and Winchester 16 gauge ammo.

I long know all the things you note and agree with them. I am looking for specific experience and data for use of 70 mm, USA-made hulled shotshells in 67 mm 16 gauge. FYI, I never use 70 mm hulls in 65 mm chambers but, I do follow CIP and use 67 mm hulls for both target (24 gram) and hunting (28-30 gram) in 65 mm chambered 16s.

Decades of experience with Sauer and Merkel 67 mm chambered 16 gauges leads me to expect I will see no evidence of excessive pressure. However, I have never needed to use 70 mm hulled USA-made ammo in them. I have used various USA 70mm shotshells for many seasons hunting in old Merkel gun that had chamber lengthened to 70 mm -- no problem. Gun still tight after 15 years of hunting, shooting 3-5 boxes per season. Will not be lengthening chambers in Sauer M2 hammer gun from about 1920.

Thanks,
Niklas