Your bore diameter?
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    Sidewinder
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    Your bore diameter?

    Been reloading for well over 45 years. I always slug my bore and size accordingly.

    Here's my question for my fellow casters and reloaders. My Marlin Guide Gun (mfg. 2009) mikes out at .456". I keep hearing how so many have to use .460" rounds etc. and how Marlin 45-70's are known to be overbored and need large size rounds. Most everyone repeats that the Marlin likes fat rounds.

    I cast both with Lee and Ideal moulds and size to .457 with a VERY soft mix of lead. I have no problem accruacy wise, and no leading either. I do not drive my rounds at hyper speed, as I just don't enjoy beating myself up with my weapon.

    So if ya'll could advise what your bore sized out to be it will give me an idea if I got one of the few that are either undersized or what...hope that made sense...

    Thanks, Wade
    "Never take life to seriously, that's what leads to high blood pressure and a heart attack." Lee Haney

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    Re: Your bore diameter?

    I thought it was just the 44's were over sized. Honestly I never slugged my 45/70. Tried .459 bullets & they worked so I never bothered.
    Ken,

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    Re: Your bore diameter?

    The bore in my 1895 isn't over sized...its .457", I think its the throat thats over sized and makes oversize boolits necessary. That helps to get everything aligned and pointed the right direction.

    I cast and shoot .460", hard alloy, gas checked boolits...because I push them as hard as I can push them...I like recoil!
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    Re: Your bore diameter?

    My guide gun runs about .4563, like you I size to .457 and it works great.
    "You can't miss fast enough to win a gunfight", Bill Jordan

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    Re: Your bore diameter?

    Quote Originally Posted by piguy
    My guide gun runs about .4563, like you I size to .457 and it works great.
    Just my opinion but I think a .457 is a little small for a 45.70 especially in a lead bullet. I think RidgeRunner is closer by sizing his to .460. A lead bullet should be a little larger than the bore slugs out to be.
    RON
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    Tinhorn
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    Re: Your bore diameter?

    Slugged my 1895SBL that I bought new in Jan 2010, and it's .457. I get poor accuracy with Oregon Trail 350's that everyone seems to get good results from, and thought I might have an oversized bore but that appears not to be the case. Guess I'll have to play around with powder levels.

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    Re: Your bore diameter?

    Great question Wade. No I have not slugged my 45/70’s bores.

    This is a area that causes great confusion… So maybe we can help clear up this and bury a few other cast bullet myths…

    Slugging the bore – this is done to “get a feel” of the bore condition and check for constrictions… The actual bore diameter is not what we need to calculate proper bullet fit.

    Groove dia. – This is the number that will get us close to the best bullet fit…If we shoot a bullet .001-.002” (over) groove dia. we will usually be close to best bullet fit…

    Slugging the throat, or leade – This will give the best results in selecting the proper size cast bullet…It is in this area that’s the hardest on the bullet; if the bullet doesn’t fill and seal the throat, the hot gasses will cut the bullet before getting into the rifling…
    Ever clean a rifle with a lot of leading just out of the chamber?? – That’s the cause…

    Bullet obturation – is only needed by those who are shooting a bullet too small in diameter to begin with…

    Rowdy Tip of the Day –
    The easy way to find the correct bullet fit without going thru that entire BS.
    Take a fired but unresized case from the rifle and put a slight bell on it.
    With a handful of bullets, all different sizes, slip them into the neck by hand – which ever one fits tightest, but still moves without binding – That’s your bullet….

    Danny

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    Gun Wizard
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    Re: Your bore diameter?

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    Sidewinder
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    Re: Your bore diameter?

    Well, this is interesting. From what those who have slugged your bores, the average is right around .4567". Sorry, old time crime analyst is comming out here

    So if I understand correctly the throat at the breach is oversized. One must question why? To allow a multitude of non standard cartridges to fit in a lever action firearm? Due to the camming action being less than that of a bolt gun? Or is it a result of manufacturing of the barrel itself? As a former gunsmith and armourer for uncle sam, I'm puzzled....

    The other 45-70's I had in the past were all old original. A '78 TD carbine. An '84 TD rifle. And a '79 or so Sharps rifle....saddly they were sold for a down payment on a house But they were all slugged and if memory serves correct, the TD's ran about .457 and the Sharps was just a tad larger. I shot mostly ,458 sized lubed bullets in them without any problems. I did, and still do, load a lot of paper patched rounds. My lead mix has always been on the soft side probably around 30:1 or better.

    Oh well, I guess since I have a bore that measures .456" and the lubed rounds are .457" and I have no leading or bad shooting rounds issues, I'll just go back to what I was doing and not worry about it then.


    Thanks, Wade
    "Never take life to seriously, that's what leads to high blood pressure and a heart attack." Lee Haney

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    Re: Your bore diameter?

    Quote Originally Posted by Wade505
    Well, this is interesting. From what those who have slugged your bores, the average is right around .4567". Sorry, old time crime analyst is comming out here

    So if I understand correctly the throat at the breach is oversized. One must question why? To allow a multitude of non standard cartridges to fit in a lever action firearm? Due to the camming action being less than that of a bolt gun? Or is it a result of manufacturing of the barrel itself? As a former gunsmith and armourer for uncle sam, I'm puzzled....

    Thanks, Wade
    Wade - It is interesting and I’m not going to downplay anyone’s results.

    Let’s look at how a rifle barrel is manufactured and how that plays into correct cast bullet fit in general.

    Bore the hole.
    Rifling - Pull a button through the bore for MG or push a broach through for Ballard.
    Rough ream the chamber.
    The finish reamer will take the chamber to final spec – and will clean the throat/leade of any machine marks left from the rifling process…Leaving the leade a slightly larger diameter than the grooves…



    Danny


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