fmj bullet in a springfield trapdoor
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Thread: fmj bullet in a springfield trapdoor

  1. #1
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    Default fmj bullet in a springfield trapdoor

    Would like some input . What are your thoughts on using full metal jackets in a Springfield Trapdoor. Good or bad idea ? I only use black powder with a 405 gr hb I make myself but was given 2 boxes of 300 gr fmj by Hornady.

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    Old steel barrel, FMJ bullet= rapid barrel wear. Granted 100 rounds will not shoot the barrel out but why wear the old soldier. Plus, 300 gr. will not shoot well in a trapdoor. I'd shoot them in a lever action like a Marlin or Winchester.
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    I concur with the rapid wear. Sometime soon, I'll be looking to make some powder coated 405 gr. HB's - supposed to make a slick, low friction coating that won't leave any lube in the barrel to accumulate fouling as rapidly.
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    Hornady s meant for 458W are very tough .Years ago I got some very cheap from a closure.Fired them in an 1871 Henry,and the narrow lands in the rifling were ironed down quite noticably by the hard jackets.Not good in a soft steel/or iron barrel.Regards John.

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    I do not think that I want to take a chance using the fmj , that saying about something free can cost you . I also saw a youtube video from a guy called Kobe49 saying if it's not the right size ,hot gas blowing around the bullet can even cause damage to the barrel also. Will just stick with my original bullets and stick the fmj's back of shelf might have use for them down the road.

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    If gun is unaltered an has the original GI barrel, I wouldn't shoot FMJ, or even JSP/JHP in it. Shoot lead bullets and not lighter thn 375 grains. Slug your barel to determine best size.
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    That box of .458 FMJ's is the perfect rationale to begin looking for either a replica trapdoor (made with modern steel) or else one of many other rifles chambered to run on modern, hi-pressure .45-70 loads
    "Hey Look! We've got Guns ... and We've got Snacks!"
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    Bad idea. My newest one was made in 1892, using FMJs in a 125 year old black powder barrel.....?

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    Quote Originally Posted by sigshr View Post
    Bad idea. My newest one was made in 1892, using FMJs in a 125 year old black powder barrel.....?
    Well, those bullets won't break the gun (hot nitro-powder loads can, though), but will sure shoot the lands out pretty quick. Taking accuracy with them...
    Absent comrades (sound of breaking glass)

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    I would avoid using any FMJ in an original Trapdoor.

    Also, is there the possibility of excessive pressures using FMJ? I'm thinking that the bullet will be much harder to engrave into the rifling and the pressure will spike.
    Nothing worthwhile ever comes easily.

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    Quote Originally Posted by bones92 View Post
    I would avoid using any FMJ in an original Trapdoor.

    Also, is there the possibility of excessive pressures using FMJ? I'm thinking that the bullet will be much harder to engrave into the rifling and the pressure will spike.
    Depends on how hot you load it with what powder. In general, with suitable loads, probably not. But still won't save the lands.

    Trapdoor actions are stronger than many realize - a number of them (at least six I think) were used to do ammo development for the 30-40 Krag back in the early 1890s. Special serial number sequence. None broke as far as I know. One is (or was) in the museum at Fort Sill (back in '64 when I was there for ROTC summer camp). No longer recall the serial, except it was single digit.
    Absent comrades (sound of breaking glass)

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    Think that this is one case where the bullets are actually harder than the barrel steel. There was an article I believe in the Single Shot Exchange magazine and one of the first things the author mentions is to never ever shoot copper jacketed bullets in a trapdoor springfield as the rifling will go south in less than a hundred rounds. I'm inclined to believe him as his business at the time was selling trapdoors. Don't know how many rounds a Krag barrel is supposed to last but almost saw a guy reduced to tears years before replacement barrels were available for the Krag. Seems he would reload about a hundred rounds and shoot same every week. Nice Krag carbine. Came into a gun shop complaining about accuracy. His alternative at the time was try to find another carbine barrel or have a 1903A3 barrel cut down,rethreaded and chambered. That is why so many shooters who have trapdoors and krags only shoot cast bullets in them. Preserve your trapdoor as there are a few dealers of cast bullets who offer different bullet hardness cast bullets. I used to cast 500 grainers out of wheel weights and pure lead a 50-50 mix. And slug your barrel to find out what your bore dimensions are and size to about .002 over that. Your trapdoor will thank you. Frank

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    Thanks to all the replies. I all ways enjoyed history and shooting growing up and have grown a pretty good collections of firearms in my life and do not want take a chance of hurting a piece of history . Me and my son plan on shooting them for quite some time still , none of them are collecting dust in the gun safe !. This forum has been a great wealth of information over the years. Thanks again and God bless.

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    How about plated bullets? Is it OK?

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    Quote Originally Posted by alexnev View Post
    How about plated bullets? Is it OK?
    Coppr plated bullets SHOULD be OK, though I know of no tests or experience with them in old guns.

    I have used them in some of my modern arms, and the bullets seem to reduce leading and the plating seems to be quite thin and soft.
    Absent comrades (sound of breaking glass)

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