Can u put 3" magnums in an 870 pump?

[Bob33]

Also, what shells should I tell him to buy, I figure two different kinds for duck and goose? Steel only?

You can't shoot lead for waterfowl. Don't even take any with you.

Steel is the most common, and least expensive lead substitute. There are better substitutes but they are more costly, and you may not need them.

The primary difference to consider between ammunition for ducks and geese is shot size. Generally speaking, larger shot sizes are used for geese since they're larger.  However, it depends on the distances you plan to be shooting at. If you are shooting steel, shot sizes for ducks between #2 and #4 are probably the best. For geese you'll probably want BB or a bit larger.

There are two other variables: (1) the amount of shot, measured in ounces, and (2) the velocity. They work in opposite: everything being more shot means less velocity. Right now it seems that velocity is more desirable than shot but that's personal preference. Don't get too hung up on this.

[trophyhunt]

The port is 3" if that matters, does anyone have a magnum that doesn't look like my pics?

[bobcat]

I just went out and pulled mine out of the safe. Mine is identical to yours. Serial number ends with an m and the port measures exactly 3 inches. I'm pretty sure the receiver should be stamped 3 inch magnum if it was made for 3 inch shells. Like lokidog, I have fired a few 3 inch shells in mine, and just as he said, they tend to get stuck when ejecting through the port. I would recommend using only  2 3/4 inch shells and use something better than steel shot. For ducks 2 3/4 inch steel loads are fine but for geese you need something better, in my opinion.

[Bob33]

What matters is the chamber size. At the front of the chamber is a tapered forcing cone. When the shell is fired, the crimp opens. If the crimp hits the forcing cone, it can damage the barrel.

A chamber designed to shoot 3" shells will have a long enough chamber such that the the crimp can freely open without pushing about the forcing cone.

If you do shoot a 3" shell in a chamber designed for 2 3/4" it probably won't explode but more likely would damage the gun.

It's really very simple - if you're not sure, don't shoot 3" shells. You can kill plenty of ducks and geese with 2 3/4" ammunition.

[emac]

My picture won't post for some reason but mine says magnum right after express on both mine

Sent from my XT1254 using Tapatalk

[bobcat]

The stupid thing is the barrel is made for 3 inch shells, but the receiver is not. So it's safe to shoot the 3 inch shells, they just don't eject reliably. And when I say this I'm only referring to the Remington 870 Express.

[muzzlebuck]

Express = 2 3/4"
Express Magnum = 2 3/4" & 3"
Express Super Magnum = 2 3/4"  3" & 3 1/2"

[Bob33]

https://support.remington.com/02_PUMP_ACTION_MODEL_870%E2%84%A2/If_I_have_a_Model_870_barrel_that_is_marked_for_3-inch_shells,_can_I_use_this_barrel_in_my_Model_870%3F

"All barrels are clearly marked with chamber information located about half way down on the left-hand side, "side opposite ejection port". Receivers are marked with letters at the end of the serial number that determine ejection size. "

[trophyhunt]

Thanks guys, I knew I would get the answers I needed! On the Remington web site it says you have a magnum receiver if the last letter in the serial number is an M.  Mine does. 

[scudmaster]

The challenge is that the 2 3/4 receiver with a 3" barrel will chamber #' shells and eject them...until they are fired.  The shell measurement is the opened hull, not the crimped hull.  The receiver will say what shells it capable of accepting. Unless the gun is a wingmaster made before 1987, it is likely a 3" gun. All Express are 3"

[scudmaster]

I really like the Hevi Metal...mid line in the price and better than steel.

[bobcat]

That's good to see the official answer to the question from Remington. But still, I won't shoot 3 inch shells in mine because they sometimes get jammed up in the ejection port.

[trophyhunt]

That's good to see the official answer to the question from Remington. But still, I won't shoot 3 inch shells in mine because they sometimes get jammed up in the ejection port.

yes it's nice to see the website reaffirm everything!  Thanks very much again