Quickload request for 280AI RL26 and 150LRAB

[MAinAR]

This is a custom build by Dan Glover with a 27" Brux barrel on a Sendero in SAAMI Nosler 280 Ackley Improved. (this setup has been running the 140ABs at 3,250fps with 60gr imr4831, magneto speed)

Thinking that with this long of barrel I may be able to go as slow on burn rate as the RL26 that I have been testing in other calibers, especially with the 150lrab.

Could I please get a Quickload estimate on this setup:

Nosler 280AI
Nosler Brass
Fed210 or (can go 215 if needed)
OAL 3.33
RL26 Powder
27" barrel
150LRAB

The RL 26 has VMD conversion factor of 0.0670 so looks to me like mite get up near 65gr in the case under 150lrab.

Any help would be appreciated as I am really feeling around in the dark on this combo!

I noticed that Nosler manual list 60.5gr of H831SC with the 150LRAB at a 97% capacity and when I run the VMD factors comparing density the H4831SC at 60.5gr occupies 4.32cc's so to get to equal density with the RL26 at 64.5gr is also 4.32cc's volume, so it will "fit", but got to check predicted pressures.

 

[FOTIS]

Cartridge          : .280 Ack Imp
Bullet             : .284, 150, Nosler Accubond LR 58734 G7
Useable Case Capaci: 65.290 grain H2O = 4.239 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 27.0 inch = 685.8 mm
Powder             : Alliant Reloder-26

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   93    60.30   2952    2902   44805  10650     99.9    1.406
-09.0   94    60.97   2986    2969   46533  10706    100.0    1.382
-08.0   95    61.64   3020    3037   48337  10753    100.0    1.358
-07.0   96    62.31   3054    3106   50219  10794    100.0    1.335
-06.0   97    62.98   3087    3175   52186  10832    100.0    1.312
-05.0   98    63.65   3121    3244   54240  10869    100.0    1.290
-04.0   99    64.32   3154    3314   56374  10906    100.0    1.268  ! Near Maximum !
-03.0  100    64.99   3187    3384   58633  10941    100.0    1.246  ! Near Maximum !
-02.0  101    65.66   3220    3454   60982  10975    100.0    1.225  ! Near Maximum !
-01.0  103    66.33   3253    3525   63443  11008    100.0    1.205  ! Near Maximum !
+00.0  104    67.00   3286    3596   66017  11040    100.0    1.184  !DANGEROUS LOAD-DO NOT USE!
+01.0  105    67.67   3318    3668   68705  11070    100.0    1.165  !DANGEROUS LOAD-DO NOT USE!
+02.0  106    68.34   3351    3740   71504  11100    100.0    1.145  !DANGEROUS LOAD-DO NOT USE!
+03.0  107    69.01   3383    3813   74427  11128    100.0    1.126  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    69.68   3416    3886   77482  11155    100.0    1.107  !DANGEROUS LOAD-DO NOT USE!
+05.0  109    70.35   3448    3960   80675  11180    100.0    1.089  !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    104    67.00   3413    3881   83397  10566    100.0    1.087  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    67.00   3086    3171   50787  11609     99.2    1.317

 

[MAinAR]

Exactly as I suspected! Thank you so much.........now back to the loading bench. IF this is will be relatively temperature stable at all it will have huge impact on brass life. Really like where the pressures move down to.

 

[Dwh7271]

Fotis,
You must have picked up the update!
Duh. Guess I could have figured that out. :grin:
Anything new and cool on it? Other than the new RLs?