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 Reloader 15 - Hornady 75gr. BTHP Match - AR15
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BMP
Starting Member



USA
9 Posts

Posted - May 23 2010 :  10:41:30  Show Profile  Send BMP a Yahoo! Message Send BMP a Private Message  Reply with Quote
I e-mailed Alliant last week but they never got back with me on this. I'm looking for a good starting load.
Specs:
AR15 - 26" WOA barrel 1-8 twist
Reloader 15
Hornady 75gr. BTHP Match
Remington cases
Remington 6 1/2 primers

Thanks for any help!

Brad

AR15 26" WOA .223
AR15 pistol 7.5" .223
AR15 16" .300 BLK pistol gas
AR15 17" bull barrel 22LR

ten2six
Advanced Member



USA
3569 Posts

Posted - May 23 2010 :  11:08:02  Show Profile Send ten2six a Private Message  Reply with Quote
Welcome to the 'Nest Brad,

Is the rifle chambered for 5.56 or .223 loads?

ten

"Chances are, when we meet intelligent life forms in outer space, they're going to be descended from predators."
- Michio Kaku
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BMP
Starting Member



USA
9 Posts

Posted - May 23 2010 :  11:23:47  Show Profile  Send BMP a Yahoo! Message Send BMP a Private Message  Reply with Quote
It has their "varmint chamber" I would say .223 but I can't say for sure.

Brad

AR15 26" WOA .223
AR15 pistol 7.5" .223
AR15 16" .300 BLK pistol gas
AR15 17" bull barrel 22LR
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ten2six
Advanced Member



USA
3569 Posts

Posted - May 23 2010 :  11:41:39  Show Profile Send ten2six a Private Message  Reply with Quote
Hey Brad,

The rifle will have the chambering marked on the barrel. I ran the information through QuickLOAD with .223, so if you find out different, let me know and I can re-run it. I looked through the Alliant manual I have and they have a .223 load with a 77 gr Sierra bullet with 24.1 gr of RL15. The "+00.0" load of 22.5 gr has a pressure right on the (Maximum Allowable Pressure - 15%) line. The data below shows loads above and below this in 2% increments. The numbers get jumbled up when I paste them, so if you have any trouble reading them, or if you have any questions, let me know. As always, every gun is different, so start low, work up, and watch for pressure signs.

Cartridge : .223 Rem. (SAAMI)
Bullet : .224, 75, Hornady BTHP M 2279
Useable Case Capaci: 24.385 grain H2O = 1.583 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 27.3 inch = 692.9 mm (26.0 inch of bore)
Powder : Alliant Reloder-15

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 80 18.00 2258 849 24886 4593 85.2 1.685
-18.0 82 18.45 2313 891 26496 4744 86.5 1.644
-16.0 84 18.90 2367 933 28213 4891 87.8 1.604
-14.0 86 19.35 2422 977 30046 5036 89.0 1.565
-12.0 88 19.80 2477 1022 32006 5176 90.1 1.527
-10.0 90 20.25 2532 1067 34100 5312 91.2 1.491
-08.0 92 20.70 2587 1114 36339 5443 92.3 1.455
-06.0 94 21.15 2641 1162 38722 5569 93.2 1.415
-04.0 96 21.60 2696 1210 41243 5689 94.2 1.377
-02.0 98 22.05 2750 1260 43924 5803 95.0 1.339
+00.0 100 22.50 2805 1310 46790 5910 95.8 1.303 ! Near Maximum !
+02.0 102 22.95 2859 1361 49854 6010 96.5 1.269 ! Near Maximum !
+04.0 104 23.40 2913 1413 53133 6103 97.2 1.235 ! Near Maximum !
+06.0 106 23.85 2967 1466 56646 6188 97.8 1.202 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 24.30 3021 1520 60411 6265 98.3 1.171 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 24.75 3074 1574 64452 6333 98.8 1.141 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 100 22.50 2948 1447 56345 5900 99.5 1.209 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 100 22.50 2620 1143 37705 5638 88.4 1.426

Stay safe...shoot straight. ten

"Chances are, when we meet intelligent life forms in outer space, they're going to be descended from predators."
- Michio Kaku
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BMP
Starting Member



USA
9 Posts

Posted - May 23 2010 :  20:54:39  Show Profile  Send BMP a Yahoo! Message Send BMP a Private Message  Reply with Quote
That will be great! Thanks for your help! I'll post results when I can. Again, thanks a million!

Brad

AR15 26" WOA .223
AR15 pistol 7.5" .223
AR15 16" .300 BLK pistol gas
AR15 17" bull barrel 22LR
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ten2six
Advanced Member



USA
3569 Posts

Posted - May 23 2010 :  22:25:19  Show Profile Send ten2six a Private Message  Reply with Quote
Brad,

You're welcome. I looked in my Hornady (6th ed) manual, and they also had the 75 gr BTHP w/ RL15 for the 5.56. Load range was 20.0 gr starting, up to 24.1 gr MAX. If it were me, I'd start around 21.0 and work up in .5 gr intervals watching for pressure signs.

Good luck...good shooting. ten

"Chances are, when we meet intelligent life forms in outer space, they're going to be descended from predators."
- Michio Kaku
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BMP
Starting Member



USA
9 Posts

Posted - May 23 2010 :  22:56:30  Show Profile  Send BMP a Yahoo! Message Send BMP a Private Message  Reply with Quote
Thanks again ten. I loaded some up at 21, 21.5, 22 and 22.5. I'll see where it takes me. Looking to get some distance out of this rig!

Brad

AR15 26" WOA .223
AR15 pistol 7.5" .223
AR15 16" .300 BLK pistol gas
AR15 17" bull barrel 22LR
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ForneyRider
New Member

USA
36 Posts

Posted - May 26 2010 :  15:02:06  Show Profile Send ForneyRider a Private Message  Reply with Quote
I have shot a lot of R15/75gr BTHP in my 1:9tw AR with Rem brass and various primers. You can load them to mag length(2.26in COL) or stretch them out. Mine scratch the bullet at 2.28in COL.

When all is said and done, there is a lot more said than done.
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aj3156
Senior Member



USA
480 Posts

Posted - May 26 2010 :  15:26:05  Show Profile Send aj3156 a Private Message  Reply with Quote
Watch those 6 1/2's Brad. They are very soft, not a good idea in an AR platform. Welcome and stay safe.
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BMP
Starting Member



USA
9 Posts

Posted - May 26 2010 :  17:42:59  Show Profile  Send BMP a Yahoo! Message Send BMP a Private Message  Reply with Quote
I was reading somewhere that the Remington and CCI primers were preferred. Are the 7 1/2's harder than the 6 1/2's? Thanks for the heads up aj!

Brad

AR15 26" WOA .223
AR15 pistol 7.5" .223
AR15 16" .300 BLK pistol gas
AR15 17" bull barrel 22LR
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aj3156
Senior Member



USA
480 Posts

Posted - May 26 2010 :  17:57:42  Show Profile Send aj3156 a Private Message  Reply with Quote
Yeah the 7 1/2's are harder. CCI 400 or 41 are both fine for .223.
Wolf small rifle magnum are similar to the mil. spec. 41's. They are very good primers also and a bit cheaper.

Edited by - aj3156 on May 26 2010 18:01:36
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BMP
Starting Member



USA
9 Posts

Posted - Mar 30 2011 :  22:15:44  Show Profile  Send BMP a Yahoo! Message Send BMP a Private Message  Reply with Quote
I ended up running 24 grains of Reloder 15 on my set up. It shoots pretty good. Now I just need a little practice shooting at 500 yards! Thanks guys for all your help! Go here: http://www.ar15.com/forums/topic.html?b=3&f=4&t=531783 to see my range report.

Brad

AR15 26" WOA .223
AR15 pistol 7.5" .223
AR15 16" .300 BLK pistol gas
AR15 17" bull barrel 22LR
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