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Thread: 450 Bushmaster - more info

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    Happy Camper hcpookie's Avatar
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    Default 450 Bushmaster - more info

    Of all places Wikipedia. So take it at face value.

    Brief summary of the info indicates the .450 Bushmaster is a modified .45 Professional developed by LeMag Firearms. The parent cartridge is 1.77", where the .450 Bushmaster is 1.70" to handle the Hornady ballistic-tip bullet. Both are apparently based on the .284 case, with a rebated rim, presumably for use with the AR bolt.

    A quick glance at the Handloader's Manual of Cartridge Conversions indicates the .284 Winchester measures 1.775" from the base up to the bottleneck. Therefore, it appears that the conversion is as simple as cutting the .284 at the bottleneck, and you have a .45 Professional round. Trim it to 1.70" and you have .450 Bushmaster brass. I don't know if neck reaming is necessary but it probably is.

    The base of the .284 Winchseter is .473". Yes, that's the same as a .30-06/.308 family round. Therefore, one would expect that -06 brass couls be converted to .450 Bushmaster by "simply" cutting to 1.70".

    Things that make you go HRM.


    I can't find anything on the "45 Professional" parent cartridge no on the LeMAG company. Every search gets hits for "L E MAG" articles.



    Here are the source quotes:

    http://en.wikipedia.org/wiki/.450_Bushmaster


    The .450 Bushmaster (parent cartridge is the 45 Professional) rifle/cartridge conversion, was developed by Tim LeGendre of LeMAG FIREARMS LLC., and licensed to Bushmaster Firearms International LLC., for production and distribution. LeGendre still retains ownership. The 450 Bushmaster is designed to be used in the standard M-16/AR-15 platform, using standard magazines.

    Bushmaster asked Hornady to produce the 45 Professional ammunition for this project, Hornady agreed. Hornady wanted the 45 Professional shortened, to accommodate their Venerable 250gr., Pointed, SST bullet. Hornady asked Bushmaster for the change (1.771" to the now standard 1.700"), Bushmaster asked LeGendre to sign off on that change, and he did. Bushmaster eventually wanted a name change and LeGendre agreed, to what has now become the popular 450 BUSHMASTER.

    Based on a concept by Col. Jeff Cooper (Thumper), the goal was to provide guaranteed one-shot kills on Big Game animals at 250 yards, with a large bore semi-auto (44 cal or larger). Col. Cooper upon being presented with the early 45 Professional stated??this is Thumper Senior?I can now own an AR-15?. A 45 Pro was indeed built for Col. Cooper, by LeMAG, pretty good considering his disdain for the AR-15 in 5.56 NATO. Hornady, with its extreme expertise, busted the Cooper 250yd limit. The result is the 450 BUSHMASTER, a semi-auto rifle/cartridge combination that absolutely provides more than enough stopping power to adequately kill all Big Game in North America.

    I came across only one other reference on a blog page, again take it at face value:


    It has been called to my attention that when I referred to the "45 Professional" cartridge dreamed up by Tim LeGendre, I should have said that it was based on the 284 case, rather than the 280 case. The 284, with its rebated rim, permits a slightly larger powder capacity than the 280.
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    Gunco Regular Gunter's Avatar
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    I don't know if they ream either, but a 30.06 cut at 1.700 loaded with a 44 magnum bullet there is some taper. IIRC the brass at the mouth was .011 or so thick after opening them up.

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    tired of idiots vz58's Avatar
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    Guns & Ammo 2000 Annual, pages 44-47

    is supposed to have info on it

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    Happy Camper hcpookie's Avatar
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    Gunter what cartridge are you talking about? Do tell!
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    No Hope For Me 1biggun's Avatar
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    30-06 brass will not work for the bushmaster. the reason is that 284 winchester is a REBATED ROUND FORM THE FACTORY. the case head above the rim is .500 very close to the size of a magnum round. the other thing that I have noticed about the bushmaster is that it also is a round that hornady uses SPECIAL powder not avaliable to the reloader. it offers better than 444 marlin in a smaller package but only with FACTORY $30-$40 ammo. If handloaded it will not be as good.
    the 450 bushmaster is not much more than a rimless & rebated 458x1.5 (made from cut down 7mm brass or simular)! Im still pissed that I didnt build mine before it came out but oh well. it would be nice if reamers were avaliable for it same can be said for the 458 SOCOM. personaly i like the SOCOM better as it head spaces off the neck and not the case mouth and I think hase more case capacity.

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    No Hope For Me 1biggun's Avatar
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    OH yea the hornady bullets with the plastic tip are not avaliable also except in loaded ammo.

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    HC it is one that I made up some dummy rounds for while looking at the 458x1.5 Barnes and 458x2 American that 1biggun had in his 458 ideas post. Just an extended 44 automag. The std automag and 1.5 Barnes were too short for the AK mag and the x2 American was too long. Its one of those projects that will I get around to someday.

    ETA: I can get a pic of it if you want to see.

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    gunco irregular moleman's Avatar
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    Quote Originally Posted by 1biggun View Post
    OH yea the hornady bullets with the plastic tip are not avaliable also except in loaded ammo.

    Have you tried looking at muzzle loading bullets? I know Hornady has balistic tip bullets available in 44 and 45 for use in muzzle loaders but they're not cheap. Somehow when they put them in the muzzle loader box there's only room for 20 with sabots and they still run about $12 a box. The sabots would be useless to you though unless you have a muzzle loader. I'm still using their sabots and 44 lswchp. I've got no complaints from the deer so far.

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    Happy Camper hcpookie's Avatar
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    Quote Originally Posted by Gunter View Post
    HC it is one that I made up some dummy rounds for while looking at the 458x1.5 Barnes and 458x2 American that 1biggun had in his 458 ideas post. Just an extended 44 automag. The std automag and 1.5 Barnes were too short for the AK mag and the x2 American was too long. Its one of those projects that will I get around to someday.

    ETA: I can get a pic of it if you want to see.
    Please do! I think it is great to see so many options that are out there for conversions of this size. My only hangup with the .44 size is the lack of ammunition and barrels for this particular application.
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    No Hope For Me 1biggun's Avatar
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    Ill have to check out the saboted rounds. I wasnt aware that they used a .430 dia bullet in the sabots. there are not a lot of bullets to chose from in .430 but the ones that are avaliable are pretty good. anything i hunt it going to die if it is shot any were close to were I aim with a 265 grain jacketed flat point out of a 444 marlin. infact it out performs the 45-70 in many areas. I would still love to see a .430 rifle style bullet with a point. the reason that there is not much to choose from is that most 44 cal rifles are lever action and there for are tube feed and that prevents pointed bullets. new blanks are avaliable for the same as other calibur new blanks. not a lot of surplus or take of barrels around however.

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