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I have 2 870's. One is a 3 1/2". The other is quite a bit older, and I believe the barrel is chambered for a 3", but I'm not sure. I don't have a 3" headspace gauge, but I can put a 3 1/2" shell in with no reistance. On the barrel it says, : "Use 2 3/4 or 3" Shells in Magnum Receivers. Use only 2 3/4" in all others." There is no difference in a 3" and 2 3/4" receiver. Is it safe to fire 3" shells in this shotgun?
 
Posts: 1450 | Location: Dakota Territory | Registered: 13 June 2000Reply With Quote
<George Hoffman>
posted
JD
You can shoot 23/4 abd 3" shells in a 3" chamber.
A 31/2 inch shell will go in a 3" chamber but do not fire it. When the crimp opens up it will open in the forcing cone and cause very high pressures.
George
 
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If the last digit of your serial number is an "M", you've got a magnum action. If you still aren't sure about shooting 3's in it, take it to a gunsmith and have them check it out.
 
Posts: 121 | Location: Prosser, WA | Registered: 12 December 2002Reply With Quote
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George, sure I wouldn't shoot the 3 1/2 in it; it wouldn't feed or eject anyway because the loading port is too short. I just wanted to know if you could put a 3 1/2 in a 3" chamber but not a 2 3/4".
 
Posts: 1450 | Location: Dakota Territory | Registered: 13 June 2000Reply With Quote
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