Ar15 450b 10.5 barrel

T/C Encore in 450b anyone?

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Ar15 450b 10.5 barrel

Postby deerbuster » Sat Nov 16, 2019 6:00 pm

Does anyone have ballistics, trajectory for 10.5 bushmaster?
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Re: Ar15 450b 10.5 barrel

Postby Bmt85 » Sun Nov 17, 2019 8:33 am

I haven’t seen any actual chrono numbers for a 10.5”. I’ve seen some numbers for 12-13” barrels that put Hornady 250gr factory ammo at around 100-150fps less than a 16”. So maybe 1950-2000fps area. I found chrono numbers for Windhams 9” barrel with Hornady’s 250gr ammo, which is 1730fps.

So my guess is going to be somewhere around 1850fps for a 10.5” barrel, using Hornady 250gr factory ammo. If you reload, you will probably gain a little more.
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Re: Ar15 450b 10.5 barrel

Postby deerbuster » Sun Nov 17, 2019 4:33 pm

Thanks for the info. I need to find some reload data for a good deer hunting load also.
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Re: Ar15 450b 10.5 barrel

Postby Hoot » Sun Nov 17, 2019 8:51 pm

deerbuster wrote:Thanks for the info. I need to find some reload data for a good deer hunting load also.


Whatever your choice of bullet for deer hunting with a 10.5" barrel, you definitely want to stay with powders equal to or faster than Lil Gun or you'll be spitting out a lot of unburned powder. That is, assumnig you're not looking for a subsonic load due to running a can on that 10.5. I have zero experience with subsonic loads.

In a 10.5, consider running Alliant 2400 powder and a Barnes 200gr XPB or Hornady 200gr FTX if you're going for supersonic.

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Re: Ar15 450b 10.5 barrel

Postby Bmt85 » Sun Nov 17, 2019 9:58 pm

With the reduced velocity, I would recommend the 275 TSX, Makers 250gr, or Makers 275gr. I know those are a little heavy and they will be running a little slow, but the 275 TSX has a minimum velocity of 1200fps, and from what I can see, the Makers are rated at around 2000fps max. I would start load work up for all of them off Hodgdons data for the 275 TSX.
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Re: Ar15 450b 10.5 barrel

Postby deerbuster » Mon Nov 18, 2019 2:28 am

Thanks for the info. I was wondering about the pistol powder being good in the short barrel. I will try the 200 and 250/275 grain. Probably wont work a load up for this season with work schedule and season already underway but will in the future. Thanks again, great info.
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