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Thread: .45 bushmaster (thumper) ak

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    Gunco Veteran muttman's Avatar
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    Default .45 bushmaster (thumper) ak

    The .45 BM as I look over the specks of the round should be a good round for the ak. Low presure, will fit a 5.56 mag(with a new folower). The only down side sofar is a reamer and headspace guage's. What do you think.

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    Gunco Veteran muttman's Avatar
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    yes that is a slight problem, look at the .248 win (I think) and that should be the parent case. muttman

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    No Hope For Me 1biggun's Avatar
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    I STARTED A THREAD A WHILE BACK ON THE 450. IT WOULD BE A GOOD ROUND. iM SURE A REAMER CAN BE HAD FOR AROUND $125 SELL IT WHEN YOUR DONE.

    BRASS IS SHOWING UP IN SOME PLACES. MIDWAY SHOWS IT (I THINK).

    iM JUST GOING TO DO A 458 WIN AND HAVE THE REAL THING. A AK DOSENT NEED TO BE CONFINED TO A AR LENGTH MAG. I HAVE THE REAMER JUST NEED TO BLANK AND THE TIME.

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    Gunco Veteran muttman's Avatar
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    biggun,
    I like the round, 19-20" in b-gell, low presure(33k) and if the need to plink then reload with 230gn bulet or for hunting, muzzel loder bulets. yes midway does have ammo. green mtn listed barrel blanks but sells them with a differnt vender. brass might be made from 248 winn brass but the .45 bm uses a small primer, on target issues.
    the ar lenth mag is not the deal breaker for me could make a new flower for a 5.56 ak mag. muttman

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    No Hope For Me 1biggun's Avatar
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    Id say go for it. one thing to watch out for is how close the chamber gets tot he barrel pin. its got to be close. Id start with a virgin trunion if possable like the ones R guns has and then go from there. Im not against the round its just a 458 win will do every thing better and cheaper if 308 brass is used. the round can be down loaded to any pressure you want.

    if the round was cheap to shoot Id be all over it but its still way to damm pricey for a round that dosent give the perfomance of the 358 or even the 35 remongton if its loaded up.


    the up side is you can use normal reciver, mags (with mods) and every thing else in the kit if you like a really thin barrel other wise Id be looking for bigger ID RSB GB hand guard retainer FSB ETC. it certainly would make a cool gun

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    Happy Camper hcpookie's Avatar
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    Yes it will be a good 'intermediate' round. Bigger capacity than the .45 Winmag and the .44 ?? Gunco Special since it is based on the .284 cartridge. Components are a bit pricey but at least they are making stuff for it.
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    Quote Originally Posted by 1biggun View Post
    Id say go for it. one thing to watch out for is how close the chamber gets tot he barrel pin. its got to be close.
    When I was planning my Beowulf build I wondered what to do about that problem. Then I scored a virgin trunnion which made things simpler.

    Anyway, a Yugo trunnion doesn't have rivets behind the barrel, so you can rivet the barreled trunnion into the receiver. I was thinking about putting the barrel and trunnion together, shaping the pin to the diameter of the barrel, then running the chambering reamer in through the trunnion. Most reamers are plenty long enough to reach.

    Downsides:

    1) you'd have to reach about two inches from the back of the trunnion to the pin. Shaping it would take a steady hand.

    2) the pin really ought to be about the same hardness as the barrel

    3) the discontinuity between the pin and the barrel would act as a chip breaker. It might do odd things with a highly tapered cartridge like a 7.62x39, but it shouldn't make much difference to a nearly-straight cartridge.

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    Quote Originally Posted by 1biggun View Post
    Id be looking for bigger ID RSB GB hand guard retainer FSB ETC.
    The Chinese bits I scavenged are all .020-.030-ish bigger than Romanian bits. There's a little room to open them up a bit more if you need to.

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    No Hope For Me 1biggun's Avatar
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    the problem is not case capacity its the pressure you should limit it to. there are some gains from extra case capacity but the pressure is the limiting factor IMOO A saiga 308 would be a good start but that aint cheap. if the bush master could run at 55,000 PSI then you would really have some thing. Im hoping the round catches on and brass and reamers become more common and cheaper. a Yugo trunion could have the bulges milled off so to fit a standard reciver some what and make things easier.

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