Big bore guns

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  • #1425
    txwatcher91
    Participant

    I was thinking about getting a Sam Yang .45 big bore rifle but had a few questions regarding it.
    1. How many good shots does it get on a fill?
    2. Can it be modified to shoot close to 250 fpe?
    3. What is the actual diameter of the bore of the gun?
    4. Would the below mold be easy to use to make .454 round balls?

    Here is the link to the site that sells this mold
    Thanks,
    Tyler

    #32815
    wvanryper
    Participant

    > 1. How many good shots does it get on a fill?
    >
    The are two power levels, but you’ll probably want to
    shoot on high unless you’re just fooling around. On high
    you’re looking at maybe 7-8 from a 3000 psi fill before
    POI starts to drop too much.

    > 2. Can it be modified to shoot close to 250 fpe?
    >
    Check out:

    http://sniper99.wordpress.com/2006/12/07/attention-big-bore-44-sam-yang-owners-2/

    …to read about a 909 modded for something like 270 fpe.

    > 3. What is the actual diameter of the bore of the gun?
    >
    At least 0.4545 at the muzzle end of mine.

    > 4. Would the below mold be easy to use to make .454 round balls?
    >
    You can shoot home-cast .454 rounds, but you might not be happy with
    the results even if you sort out the best with regard to
    sprue flats and mold lines. Depends on the actual diameter
    of the product you wind up with.

    Hornady .457 rounds (most 0.457+) work a lot
    better than smaller home-cast and commercial rounds..
    Speer .457 rounds also work well, so you might be
    better off looking at a nominally larger-sized mold.

    Hornady 255 gr Cowboy bullets at just over 0.454 shoot well,
    but not similarly-sized rounds. YMMV, and you’d have to
    experiment with the best projectile fit for your bore, but my
    experience of “bigger than you might expect” seems in line with
    the general consensus.

    William

    #32820
    rob3dr
    Participant

    YMMV but I get around 6 good shots out of mine at around 185fpe before POI drops at 50 yards.

    I use the .454 rounds in it. Havent tried the .457. Forget .451, may as well be throwing the balls by hand.

    It can be modded, but shot count will drop of course with the higher fpe… if you want high FPE to start with, talk to Joe Bontranger. He builds big bores without much wait time and can tune them to your power needs.

    #32824
    voltar-1
    Participant

    orrrrr….. 🙂 coould do a Condor convert to .45 and do the 300fpe with RB and 450fpe with Bullets :):):)

    #32827
    rob3dr
    Participant

    I wish I had the know how, Walter……

    #32852
    txwatcher91
    Participant
    quote rob3dr:

    YMMV but I get around 6 good shots out of mine at around 185fpe before POI drops at 50 yards.

    I use the .454 rounds in it. Havent tried the .457. Forget .451, may as well be throwing the balls by hand.

    It can be modded, but shot count will drop of course with the higher fpe… if you want high FPE to start with, talk to Joe Bontranger. He builds big bores without much wait time and can tune them to your power needs.

    Who is he? Can you give me his web site?

    Thanks,
    Tyler

    #32853
    rob3dr
    Participant

    Joe has been making guns for a little while now and more recently has been doing big bores. He made me a QB PCP conversion that I reviewed for his site, you’ll see it on the home page.

    The 2240 pistol project on his site is also mine.

    He’s also done some innovative work with air shotguns and has made a 20 gauge and is working on a .410 bore shotgun powered by air. The 20 will do slugs at around 430fpe and with shot, great patterns out to 30 yards and beyond.

    Great guy to deal with as well.

    http://www.bontragerair.citymax.com/page/page/4923607.htm

    #32859
    cygnus-x-d82
    Participant

    to up the power to above 200 fpe, the .45 needs just a few mods…one is a stiffer hammer spring, that gives about 20 fpe

    the valve chamber is too small, so drilling alot of holes in its endcap(how many and how big depends on material used in the valve which differ from gun to gun) and that should get you another 20 fpe

    lastly i cant remember if its the single tank or double tank model you can drill the transfer port out a little bit more….and that should give you additional 20+ fpe

    port and polish internals and that should give you about 5 fpe more as well….

    do it all and you have about 250 fpe total

    #32861
    txwatcher91
    Participant
    quote rob3dr:

    Joe has been making guns for a little while now and more recently has been doing big bores. He made me a QB PCP conversion that I reviewed for his site, you’ll see it on the home page.

    The 2240 pistol project on his site is also mine.

    He’s also done some innovative work with air shotguns and has made a 20 gauge and is working on a .410 bore shotgun powered by air. The 20 will do slugs at around 430fpe and with shot, great patterns out to 30 yards and beyond.

    Great guy to deal with as well.

    http://www.bontragerair.citymax.com/page/page/4923607.htm

    Thanks for the link. Do you have a idea how much he charges for his .45 magnum gun?

    #32902
    rob3dr
    Participant

    I dont know…. BUT… Jim Chapman is selling his Bontranger 45 on the American Airgun Hunters forum…. $450 If you are looking for a big bore and are serious about it, may want to jump on that one quickly.

    #32998
    txwatcher91
    Participant
    quote rob3dr:

    I dont know…. BUT… Jim Chapman is selling his Bontranger 45 on the American Airgun Hunters forum…. $450 If you are looking for a big bore and are serious about it, may want to jump on that one quickly.

    Thanks for the heads up, but it appears I missed out on that one.

    I saw his 20 gauge air shotgun and needless to say it is impressive! According to one person, he can shoot a 390gr. slug at 700 fps for over 400fpe for 5 shots! I might start looking at his shotgun too as it would be pretty cool to have a air shotgun.

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