3.5" 12ga shell in a 3" chamber?

This is a discussion on 3.5" 12ga shell in a 3" chamber? within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; I bought a Maverick 88 12ga shotgun a couple weeks back. It has a 3" chamber in it, and the gun is mostly identical to ...

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Thread: 3.5" 12ga shell in a 3" chamber?

  1. #1
    Senior Member Array Chuck808's Avatar
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    3.5" 12ga shell in a 3" chamber?

    I bought a Maverick 88 12ga shotgun a couple weeks back. It has a 3" chamber in it, and the gun is mostly identical to the Mossberg 500. Ive seen reviews and videos of people who use their 500 and even Remington 870 (also only a 3" chamber) to hunt and fire 3.5" shells through it without any troubles.

    If I were to do this, I wouldnt be putting a ton through it, maybe just a handful of them at the end of a range day to cap things off for fun.

    So after reading those reviews, would my gun even cycle a 3.5" shell? Or is this all total BS? And if it will cycle a 3.5" shell, would it be safe to fire 2-3 every now and again?

    Just trying to not have a gun blow up in my face.

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    VIP Member Array ccw9mm's Avatar
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    If the pressures involved with a 3.5" shell are far over and above that of a 3" shell, would you be willing to risk it?

    If it technically fits, I suppose the pressure thing would be the major aspect I'd worry about. Secondarily, I'd be concerned with function. If designed for 3" shells, it'll likely run well on 3", but you'll never know about reliability risks on 3.5" shells. Good bet, though, it'll run less reliably.

    BTW, I've had 2-3/4" shells run mostly perfectly in a Rem 870 12ga, but some slightly-larger (off-spec) 2-3/4" shells run a bit rougher in the same gun. My guess is, variations between, say, 3.5" shells and 3" shells would be something like that. Might work, might not, but reliability might well suffer at least a little.

    My suggestion: do what the gun's designed to do. Let the pioneers out there attempt their non-spec usage, if they want. Retain the reliability and avoid the kaboom! risk, on your own guns.
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    Senior Member Array Chuck808's Avatar
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    The pressure is the only real concern I have. If there would be any question of it, I wouldnt risk it, but if there are others who do it and can tell me there arent any problems from it, Id feel confident trying it.

    Im asking because like anything else, the ratings on pressures a chamber can take are likely VERY conservative from what Ive seen on tests with other firearms.

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    ...absolutely not...not one...the added constriction from the case being expanded over the chamber's edge and going into the barrel will cause enough extra pressure to be dangerous...and it doesn't matter how many do it...it's YOUR eyes/face at risk...

    ...pages 4-5

    http://pdf.textfiles.com/manuals/FIR...g_maverick.pdf

    ...if you're still considering it...they try one more time on page 21


    ...here's a well-written article on matching ammo to gun you may enjoy:

    http://www.backwoodshome.com/articles2/ayoob130.html
    AZJD1968, Stevew, tdave and 1 others like this.

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    When your barrel splits and looks like it can shoot left and right, up and down at the same time.. Don't call me from the ER.
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    VIP Member Array Badey's Avatar
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    Not a good idea.
    "My problem with life is not that it is rational nor that it is irrational, but that it is almost rational." - G.K. Chesterton

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    VIP Member Array LimaCharlie's Avatar
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    Do you also play Russian Roulette?
    I carry a gun, because a Cop is too heavy.

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    VIP Member Array jbum's Avatar
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    Be my guest your gun and your life but I would call it stupid.
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    Distinguished Member Array Hoganbeg's Avatar
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    Not only is it not a good idea but IT'S A REALLY BAD IDEA! Re-read the section in your manual about what ammo can be used in your gun and take it seriously.

    (And take most everything you see on YouTube with a grain of salt.)

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    VIP Member Array high pockets's Avatar
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    It probably won't chamber a round that is 1/2" longer than designed.

    Think about it ... Would you try to force a .357 mag into a .38 spl revolver chamber?

    Hopefully, for your sake it won't fit. If It does, then Maverick has an incredible amount of liability on the line.
    "If you make something idiot proof, someone will make a better idiot."

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    I guess that 3.5" in a 3" chamber is possible. It depends on the length of the forcing cone. When you fire it make a video, it would go viral on Youtube. Other than that, go pay about 100.00 and get your shotgun backbored and forcing cone removed.
    A wise man once said: "Bugout bag?..What's that? Is that all the junk you sidewalk commandos plan on humping when the SHTF...I'll grab a Nylon 66, a box of 22s and a poncho liner and in less than a week I will have all of your stuff and everything else that I need for the duration."

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    Seriously.... this has to be the dumb question of the day, or you really want a drwin award. Id their nothing about putting a 3.5 in shell in a 3 in chamber that sounds dangerous? It is a 3 in chamber for a very good reason..... if you decide to do this please take a video.... it will likely be a great example of what not to do for others.... :
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    The people that built it and sold it to you have specific recommendations. You might want to read the little book that came with it, or go on the internet for specific OEM cautions. I would consider it a no-no.
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    Ex Member Array IndianaSig's Avatar
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    Quote Originally Posted by oldskeetshooter View Post
    Other than that, go pay about 100.00 and get your shotgun backbored and forcing cone removed.
    It would make more sense to just buy a shotgun with a 3.5" chamber.
    oneshot likes this.

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    VIP Member Array mprp's Avatar
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    Quote Originally Posted by Chuck808 View Post
    I bought a Maverick 88 12ga shotgun a couple weeks back. It has a 3" chamber in it, and the gun is mostly identical to the Mossberg 500. Ive seen reviews and videos of people who use their 500 and even Remington 870 (also only a 3" chamber) to hunt and fire 3.5" shells through it without any troubles.

    If I were to do this, I wouldnt be putting a ton through it, maybe just a handful of them at the end of a range day to cap things off for fun.

    So after reading those reviews, would my gun even cycle a 3.5" shell? Or is this all total BS? And if it will cycle a 3.5" shell, would it be safe to fire 2-3 every now and again?

    Just trying to not have a gun blow up in my face.
    The number one rule that I follow when not wanting a gun to blow up in my face is to not cram incorrect ammunition in it

    If I were to do this, I wouldnt be putting a ton through it, maybe just a handful of them at the end of a range day to cap things off for fun.
    All it would take is one and fun may not be how the day gets capped off. For the sake of yourself and that of ours, don't be one of those people out there that do something stupid and then have the result become another firearms accident statistic that doesn't help anyone but those who try to take our guns away.

    The people in those videos you watched may have stayed in a Holiday Inn Express the night before or something, but certainly not I. We're all out here on the internet too so if you want a direct, face to face explanation of your question go down to your LGS and ask an expert.

    P.S. And if he says that it's OK, go ask another one. And Kudos to you for asking by the way.
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