Anyone Here Have Experience with Alliant Reloder 23?

[Terry Perkins]

Alliant load data lists 57.8 grs rl23 max for 3000 fps in a 24" barrel...

That looks to be a stiff load. Any pressure signs?

OAL for the 150 Nosler ABLR is 3.394". Rounds set at 3.385". Primers are not flattened. Obviously no bolt lift to judge pressure by. Primer pocket life might have to be the way to go.

 

[South Pender]

OAL for the 150 Nosler ABLR is 3.394". Rounds set at 3.385". Primers are not flattened. Obviously no bolt lift to judge pressure by. Primer pocket life might have to be the way to go.

Just out of curiosity, Terry, I ran this exact load through QuickLOAD. I set the overall case capacity to 69-gr., which is a little more than an unfired .270 Win. case (given in some sources as 68-gr.). The result, with your 28" barrel, is 3106 fps and 69,036 psi pressure (putting it in the "Dangerous Load--Do Not Use" category). The maximum safe load QL gives for your data is 55.67-gr. for 3008 fps and 61,436 psi pressure.

So the velocity is right on what you obtained for 58-gr., but the pressure looks excessive. I'm not meaning to be critical here. There are several possible reasons for the results: (1) your lot of Re 23 is slower than the norm, and certainly slower than that used by QL (if, in fact, QL actually obtains and uses the powders it gives data for), (2) QuickLOAD is just getting this wrong as far as pressure is concerned, (3) there's some structural feature of your rifle that handles pressure better than most rifles (maybe something like slightly larger-than-normal land and groove diameters). QuickLOAD is not perfect; it's based on mathematical calculations and models and can't replace actual testing.

 

[todbartell]

We are using 150 grain Accubonds LR with 58 grains of RL23 in a Browning 1885 falling block. Velocity with the 28" barrel is over 3100 FPS. Since it is a hunting rifle, only 3 shot groups at 100 yd. are utilized,
they measure .47".

When I input your load specs into Quickload and tune burn rate to match your results :

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 150, Nosler Accubond LR 58836
Useable Case Capaci: 59.205 grain H2O = 3.844 cm³
Cartridge O.A.L. L6: 3.385 inch = 85.98 mm
Barrel Length      : 28.0 inch = 711.2 mm
Powder             : Alliant Reloder-23 ?

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   98    52.20   2821    2651   47446   8994     99.7    1.357
-09.0   99    52.78   2849    2704   48800   9058     99.8    1.342
-08.0  100    53.36   2877    2757   50203   9118     99.9    1.327
-07.0  101    53.94   2905    2811   51658   9174    100.0    1.313
-06.0  102    54.52   2933    2866   53167   9226    100.0    1.299
-05.0  103    55.10   2961    2921   54731   9273    100.0    1.284
-04.0  104    55.68   2989    2976   56357   9318    100.0    1.270  ! Near Maximum !
-03.0  105    56.26   3017    3032   58044   9363    100.0    1.256  ! Near Maximum !
-02.0  106    56.84   3045    3088   59795   9407    100.0    1.242  ! Near Maximum !
-01.0  108    57.42   3073    3145   61617   9450    100.0    1.229  ! Near Maximum !
[B]+00.0  109    58.00   3100    3202   63508   9492    100.0    1.215  ! Near Maximum ![/B]
+01.0  110    58.58   3128    3259   65476   9533    100.0    1.202  !DANGEROUS LOAD-DO NOT USE!
+02.0  111    59.16   3155    3316   67521   9573    100.0    1.188  !DANGEROUS LOAD-DO NOT USE!
+03.0  112    59.74   3183    3374   69650   9612    100.0    1.175  !DANGEROUS LOAD-DO NOT USE!
+04.0  113    60.32   3210    3433   71864   9651    100.0    1.161  !DANGEROUS LOAD-DO NOT USE!
+05.0  114    60.90   3238    3492   74173   9688    100.0    1.148  !DANGEROUS LOAD-DO NOT USE!

 

[South Pender]

When I input your load specs into Quickload and tune burn rate to match your results :

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 150, Nosler Accubond LR 58836
Useable Case Capaci: 59.205 grain H2O = 3.844 cm³
Cartridge O.A.L. L6: 3.385 inch = 85.98 mm
Barrel Length      : 28.0 inch = 711.2 mm
Powder             : Alliant Reloder-23 ?

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   98    52.20   2821    2651   47446   8994     99.7    1.357
-09.0   99    52.78   2849    2704   48800   9058     99.8    1.342
-08.0  100    53.36   2877    2757   50203   9118     99.9    1.327
-07.0  101    53.94   2905    2811   51658   9174    100.0    1.313
-06.0  102    54.52   2933    2866   53167   9226    100.0    1.299
-05.0  103    55.10   2961    2921   54731   9273    100.0    1.284
-04.0  104    55.68   2989    2976   56357   9318    100.0    1.270  ! Near Maximum !
-03.0  105    56.26   3017    3032   58044   9363    100.0    1.256  ! Near Maximum !
-02.0  106    56.84   3045    3088   59795   9407    100.0    1.242  ! Near Maximum !
-01.0  108    57.42   3073    3145   61617   9450    100.0    1.229  ! Near Maximum !
[B]+00.0  109    58.00   3100    3202   63508   9492    100.0    1.215  ! Near Maximum ![/B]
+01.0  110    58.58   3128    3259   65476   9533    100.0    1.202  !DANGEROUS LOAD-DO NOT USE!
+02.0  111    59.16   3155    3316   67521   9573    100.0    1.188  !DANGEROUS LOAD-DO NOT USE!
+03.0  112    59.74   3183    3374   69650   9612    100.0    1.175  !DANGEROUS LOAD-DO NOT USE!
+04.0  113    60.32   3210    3433   71864   9651    100.0    1.161  !DANGEROUS LOAD-DO NOT USE!
+05.0  114    60.90   3238    3492   74173   9688    100.0    1.148  !DANGEROUS LOAD-DO NOT USE!

That's interesting. You've obviously used somewhat different values in QL than I used. Did you adjust the "Shot Start (Initialization) Pressure" given the closeness of the bullet to the rifling? My calculation on this very-short jump (.009") indicated that a value of 9950 was close to being right for that variable. If you go with the default value of 3626, the calculated pressure is drastically reduced. You also used the SAAMI pressure index; I used the CIP one.

Here's a thread from the Accurate Shooter Shooters' Forum that I started a while back. You can see the formula for adding to the default value of 3626. Actually, in the present case, I added in a little less than the formula would suggest for .01" jump. The 9950 works for a .03" jump, which was what I was working with for my own hunting rifles. Applying the formula for a .01" jump requires adding 6,910 to the default 3626 (or using a value of 10,536). This just makes the overall pressure worse.

 

[todbartell]

I always adjust the start pressure to reflect the actual relationship between the bullet and the rifling. I then adjust Burn Rate (ba) to match the velocity from chronograph

 

[Terry Perkins]

The 9950 works for a .03" jump, which was what I was working with for my own hunting rifles. Applying the formula for a .01" jump requires adding 6,910 to the default 3626 (or using a value of 10,536). This just makes the overall pressure worse.

So, increase the jump or reduce powder load, or both?

 

[Ltbull01]

I've burned a couple pounds of it in 22 Creedmoor, 6mm Creedmoor, 6.5 PRC, 280 Ackley, 7mm Rem Mag & 308 Norma Mag.

At least based on the results from MY lot #, I think they should of called it RL20 or RL21, as the burn rate is faster than my lot of RL22

Superb accuracy, very good velocity, very temp stable. It's a good'r

I'd agree with the burn rate comment. Seems faster than RL22 in my experience in loading the 270.

 

[Ltbull01]

At 55.5 gr RL23 with a 140NAB, Fed 210, Win brass (shoulder just touched back slightly so not a true full length sizing), I'm getting about 3060fps in my Kimber Hunter 270 (24" barrel). And half MOA!! Very shootable load.