340 Pd Cylinder Lock Up?

This is a discussion on 340 Pd Cylinder Lock Up? within the Defensive Carry Guns forums, part of the Defensive Carry Discussions category; Just Got A New S&w 340 Pd Today And Cannot Believe How Light This Thing Is. My Question Though Is If Any One Has Heard ...

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Thread: 340 Pd Cylinder Lock Up?

  1. #1
    Member Array NFEDERIC's Avatar
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    340 Pd Cylinder Lock Up?

    Just Got A New S&w 340 Pd Today And Cannot Believe How Light This Thing Is. My Question Though Is If Any One Has Heard Of Or Experienced Cylinder Lock Up Due To The Bullets Unseating Themselves From The Cases Due To The Hard Recoil When Using Magnum Loads. Just Wondering.

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    VIP Member Array Bud White's Avatar
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    Ive read about it happening but dont have a lightweight ..

    But even in the big boomers like the 454 and 500 i have never had a problem with this

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    Member Array NFEDERIC's Avatar
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    One Of The Guys I Work With Said He Heard About This But, I Myself Have Never Heard Or Read Anything To This Effect.

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    Member Array NFEDERIC's Avatar
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    I Gotta Go For Now But, I'll Check Back In The Morning For Any More Info. See Ya.

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    VIP Member Array Bud White's Avatar
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    If you wanna do a test mark one bullet and them measure it fire the rest of the cylinder and measure it again if it grows well ya know what's happening ..

    If it doesn't the first 5 then you will be ok for carry..

    I can run 5 335 - 440 grain boomers thought the 500 and they don't grow at all now i suppose if i kept one round and fired 3-4 cylinders full it would grow

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    I can get slight ''growth'' in my heavy 45-70 rounds thru my BFR and that is a heavy gun and - I apply a strong factory crimp.

    There are folks who report this in lightweights but Bud's suggestion is way to go IMO - shoot and measure - shoot and measure.

    Trouble is with the light gun, the ''Newtonian'' effect is greater such that the gun ''absorbs'' much less recoil due to its low mass - the bullets are by comparison small and high density mass so i do think you can get something like the effect of the inertial bullet-puller.

    Could be one ammo brand better than others here but never had to put this to test myself. A good crimp on a cannelure should hold bullets OK, but mag loads still need checked IMO.
    Chris - P95
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    VIP Member Array Bud White's Avatar
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    Dang its hard to believe the 45/70's are growing Roll crimp?


    I've been using Redding profile crimp with 454 and 500 and really seems to squeeze not only the crimp at the cannelure but to squeeze the whole cartridge down

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    Don't get me wrong Bud - it is minor, very minor - but measurable.

    I factory crimp very firmly on top groove - or shall we say shoulder, of the 405's - see pic. The finished round has the crimp right into that.

    But, by shot #5 there is a just detectable showing of that top groove - enough to see but in length terms very minimal. I could apply even more crimp but I want the Starline brass to do a lot of reloads!


    Chris - P95
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    http://www.rkba-2a.com/ - a portal for 2A links, articles and some videos.

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    VIP Member Array Bud White's Avatar
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    Well as long as it isn't to bad i guess its not a worry

    I really am surprised the 500 doesn't grow i got some new bullets coming 700 grainers so once there loaded ill fire 4 and see if the 5th one got longer

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    700 -

    Heck man that's around 1.6 ounces each - that'll make em awful long tho.
    Chris - P95
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    is like owning a piano and assuming that you are a musician!."


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    Distinguished Member Array fed_wif_a_sig's Avatar
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    I have put about 500 rounds through my 340PD with about 200 of them 357 mag (for quals), never had a glitch only a very sore hand after each 20 round qual course.
    Laser grip helped for sighting when hands are sore and when you know the next round will just plain suck.
    Steve
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    Member Array NFEDERIC's Avatar
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    Thanks For The Advice. I'll Try Marking One When I Go Out Next.

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    VIP Member Array Bud White's Avatar
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    Let us know what you find out

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    VIP Member Array Janq's Avatar
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    Quote Originally Posted by NFEDERIC
    Just Got A New S&w 340 Pd Today And Cannot Believe How Light This Thing Is. My Question Though Is If Any One Has Heard Of Or Experienced Cylinder Lock Up Due To The Bullets Unseating Themselves From The Cases Due To The Hard Recoil When Using Magnum Loads. Just Wondering.
    Yes.

    I'm a member at the S&W Sports Training Center here in Springfield,MA and the very similar 325PD (.45ACP) is one of favorite guns to rent and yes they are very lightweight in deed. Every time I've used it though always without failI get this condition although each time I've used their target ammo. They suggest using defensive ammo or a quality target ammo. In one case the bullet came completely unseated from casing leaving my hand covered in powder and the cylinder blocked/jammed completely.
    I've yet to try it with my own ammunition but even still the thing shoots so well I am very seriously considering picking one up as a home defense gun.

    - Janq
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  16. #15
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    Stay away from cheap bulk reloads.

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