QL for 280 AI again

[nhenry]

I have a request for 280 AI using 169 Hammer Hunters and IMR 4350.

I have a few pounds of it and very little H4350. Just wondering what I can get out of it

Thanks!

 

[DrMike]

Cartridge          : .280 Ack Imp
Bullet             : .284, 169, Hammer HH
Useable Case Capaci: 62.043 grain H2O = 4.028 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   88    49.95   2572    2483   46363   9910     98.2    1.367
-09.0   89    50.51   2599    2534   47844  10004     98.5    1.347
-08.0   90    51.06   2625    2586   49368  10094     98.7    1.328
-07.0   91    51.62   2651    2637   50937  10180     99.0    1.309
-06.0   92    52.17   2677    2690   52552  10263     99.2    1.291
-05.0   93    52.73   2703    2742   54215  10342     99.3    1.273
-04.0   94    53.28   2729    2795   55927  10417     99.5    1.255  ! Near Maximum !
-03.0   95    53.84   2755    2848   57690  10489     99.6    1.238  ! Near Maximum !
-02.0   96    54.39   2780    2901   59506  10556     99.8    1.221  ! Near Maximum !
-01.0   97    54.95   2806    2955   61377  10619     99.8    1.204  ! Near Maximum !
+00.0   98    55.50   2832    3009   63304  10679     99.9    1.188  ! Near Maximum !
+01.0   99    56.06   2857    3063   65289  10734    100.0    1.172  !DANGEROUS LOAD-DO NOT USE!
+02.0  100    56.61   2882    3117   67335  10784    100.0    1.156  !DANGEROUS LOAD-DO NOT USE!
+03.0  101    57.17   2907    3172   69445  10831    100.0    1.141  !DANGEROUS LOAD-DO NOT USE!
+04.0  101    57.72   2932    3226   71619  10876    100.0    1.125  !DANGEROUS LOAD-DO NOT USE!
+05.0  102    58.28   2957    3281   73862  10920    100.0    1.110  !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     98    55.50   2927    3214   74174  10297    100.0    1.112  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     98    55.50   2692    2719   52486  10740     96.9    1.288

 

[nhenry]

Cartridge          : .280 Ack Imp
Bullet             : .284, 169, Hammer HH
Useable Case Capaci: 62.043 grain H2O = 4.028 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   88    49.95   2572    2483   46363   9910     98.2    1.367
-09.0   89    50.51   2599    2534   47844  10004     98.5    1.347
-08.0   90    51.06   2625    2586   49368  10094     98.7    1.328
-07.0   91    51.62   2651    2637   50937  10180     99.0    1.309
-06.0   92    52.17   2677    2690   52552  10263     99.2    1.291
-05.0   93    52.73   2703    2742   54215  10342     99.3    1.273
-04.0   94    53.28   2729    2795   55927  10417     99.5    1.255  ! Near Maximum !
-03.0   95    53.84   2755    2848   57690  10489     99.6    1.238  ! Near Maximum !
-02.0   96    54.39   2780    2901   59506  10556     99.8    1.221  ! Near Maximum !
-01.0   97    54.95   2806    2955   61377  10619     99.8    1.204  ! Near Maximum !
+00.0   98    55.50   2832    3009   63304  10679     99.9    1.188  ! Near Maximum !
+01.0   99    56.06   2857    3063   65289  10734    100.0    1.172  !DANGEROUS LOAD-DO NOT USE!
+02.0  100    56.61   2882    3117   67335  10784    100.0    1.156  !DANGEROUS LOAD-DO NOT USE!
+03.0  101    57.17   2907    3172   69445  10831    100.0    1.141  !DANGEROUS LOAD-DO NOT USE!
+04.0  101    57.72   2932    3226   71619  10876    100.0    1.125  !DANGEROUS LOAD-DO NOT USE!
+05.0  102    58.28   2957    3281   73862  10920    100.0    1.110  !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     98    55.50   2927    3214   74174  10297    100.0    1.112  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     98    55.50   2692    2719   52486  10740     96.9    1.288

Thanks a bunch. A bit slower than H4350 but I'm sure I can work up a good load. My barrel runs a little fast anyways

 

[DrMike]

You are most welcome.

 

[JD338]

IMR7828SSC worked well in my 280AI with the 168 gr ABLR although velocity was on the lower end.

JD338

 

[nhenry]

IMR7828SSC worked well in my 280AI with the 168 gr ABLR although velocity was on the lower end.

JD338

I've used it in 280AI with 145 LRX going 3200 but I'm out, sadly. Haven't been able to find any more

 

[AFG270]

That 8 twist 280ai is screaming Absolute Hammers, either 155g or 140g.

My regular 280 Rem with 140g AH and IMR4350 hit 3200 fps with slight pressure sign and excellent accuracy at just over 3100.

 

[nhenry]

That 8 twist 280ai is screaming Absolute Hammers, either 155g or 140g.

My regular 280 Rem with 140g AH and IMR4350 hit 3200 fps with slight pressure sign and excellent accuracy at just over 3100.

Allen, I'm going to have to look into those at some point. At this time, I wouldn't consider myself the best reloader on the block so I've been cautious about using them. I'll have to talk to you about where to start if I get some

 

[JD338]

RL22 rocks if you can get it. Top speeds and excellent accuracy are the norm. Contrary to what you hear on the internet about temperature stability, RL22 has been just fine for me and no different than any other powder.
I did have trouble finding an accuracy node for the 168 gr ABLR with RL22 so I tried other powders to no avail. When I started using IMR7828SSC, things suddenly changed for the better

JD338

 

[nhenry]

RL22 rocks if you can get it. Top speeds and excellent accuracy are the norm. Contrary to what you hear on the internet about temperature stability, RL22 has been just fine for me and no different than any other powder.
I did have trouble finding an accuracy node for the 168 gr ABLR with RL22 so I tried other powders to no avail. When I started using IMR7828SSC, things suddenly changed for the better

JD338

I haven't been able to find much Alliant powder around in the last couple years, especially RL22 and 26. I'd love to get my hands on either.

Good gracious that rifle of yours shoots well.

 

[JD338]

I haven't been able to find much Alliant powder around in the last couple years, especially RL22 and 26. I'd love to get my hands on either.

Good gracious that rifle of yours shoots well.

Same here. I have a good supply of RL22 but down to my last can of RL26 (ferry dust).

JD338