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TomM1 Offline OP
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I normally load pretty conservatively but have worked up a load I consider about max based on velocity and pressure signs. It is:

270 Win
W-W Brass
WLR Primer
61.0 grains RL26
Barnes 129 LRX @ 3.265
Rifle is a SC Production M70, 22” Fwt barrel which yields about 3100 fps.

Due to the lack of published RL26 data, is there software available which will estimate the pressure of this load?


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Quickload will do it and quite accurately if you input numbers are accurate.

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How does the velocity compare to the same bullet using other powders?



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TomM1 Offline OP
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Originally Posted by Pharmseller
How does the velocity compare to the same bullet using other powders?



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60 grains of H4831SC nets about 80 fps less


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The 129gr LRX is not included in the latest version of QL so I got as close as I could.

Keep in mind RL-26 acts like magic pixie dust in the .270 Winchester, or at least that's what all the published data and QL seems to indicate. I haven't had the opportunity to test it myself.

Code
Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 130, Barnes 'TTSX'BT 30276
Useable Case Capaci: 59.268 grain H2O = 3.848 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-26 *C

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.794% 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

-07.9   99    58.00   2920    2461   46358  13371     98.0    1.176
-07.1  100    58.50   2950    2513   47816  13469     98.4    1.160
-06.3  100    59.00   2981    2564   49326  13561     98.7    1.143
-05.6  101    59.50   3011    2617   50894  13646     98.9    1.126
-04.8  102    60.00   3041    2670   52518  13725     99.2    1.109
-04.0  103    60.50   3071    2723   54204  13797     99.4    1.093
-03.2  104    61.00   3102    2777   55953  13862     99.6    1.077  ! Near Maximum !
-02.4  105    61.50   3132    2831   57771  13919     99.7    1.062  ! Near Maximum !
-01.6  106    62.00   3162    2886   59657  13970     99.8    1.046  ! Near Maximum !
-00.8  106    62.50   3192    2941   61620  14012     99.9    1.031  ! Near Maximum !
+00.0  107    63.00   3222    2997   63659  14048    100.0    1.016  ! Near Maximum !
+00.8  108    63.50   3252    3053   65779  14075    100.0    1.001  !DANGEROUS LOAD-DO NOT USE!
+01.6  109    64.00   3282    3109   67985  14097    100.0    0.986  !DANGEROUS LOAD-DO NOT USE!
+02.4  110    64.50   3311    3165   70281  14119    100.0    0.971  !DANGEROUS LOAD-DO NOT USE!
+03.2  111    65.00   3341    3222   72671  14139    100.0    0.957  !DANGEROUS LOAD-DO NOT USE!
+04.0  112    65.50   3371    3280   75162  14158    100.0    0.943  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba    107    63.00   3280    3105   68634  13817    100.0    0.985  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba    107    63.00   3156    2876   59031  14202     99.5    1.048  ! Near Maximum !


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Alliant doesn't list the 130 but comparing to 150's you are not maxing out. https://www.alliantpowder.com/reloa...;type=1&powderid=40&cartridge=63 I went up to 62.5 with130 Hornaday's for near 3,200 fps and no signs of excess pressure. I thought that was fast enough so stopped there.


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TomM1 Offline OP
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Originally Posted by antelope_sniper
The 129gr LRX is not included in the latest version of QL so I got as close as I could.

Keep in mind RL-26 acts like magic pixie dust in the .270 Winchester, or at least that's what all the published data and QL seems to indicate. I haven't had the opportunity to test it myself.

Code
Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 130, Barnes 'TTSX'BT 30276
Useable Case Capaci: 59.268 grain H2O = 3.848 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-26 *C

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.794% 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

-07.9   99    58.00   2920    2461   46358  13371     98.0    1.176
-07.1  100    58.50   2950    2513   47816  13469     98.4    1.160
-06.3  100    59.00   2981    2564   49326  13561     98.7    1.143
-05.6  101    59.50   3011    2617   50894  13646     98.9    1.126
-04.8  102    60.00   3041    2670   52518  13725     99.2    1.109
-04.0  103    60.50   3071    2723   54204  13797     99.4    1.093
-03.2  104    61.00   3102    2777   55953  13862     99.6    1.077  ! Near Maximum !
-02.4  105    61.50   3132    2831   57771  13919     99.7    1.062  ! Near Maximum !
-01.6  106    62.00   3162    2886   59657  13970     99.8    1.046  ! Near Maximum !
-00.8  106    62.50   3192    2941   61620  14012     99.9    1.031  ! Near Maximum !
+00.0  107    63.00   3222    2997   63659  14048    100.0    1.016  ! Near Maximum !
+00.8  108    63.50   3252    3053   65779  14075    100.0    1.001  !DANGEROUS LOAD-DO NOT USE!
+01.6  109    64.00   3282    3109   67985  14097    100.0    0.986  !DANGEROUS LOAD-DO NOT USE!
+02.4  110    64.50   3311    3165   70281  14119    100.0    0.971  !DANGEROUS LOAD-DO NOT USE!
+03.2  111    65.00   3341    3222   72671  14139    100.0    0.957  !DANGEROUS LOAD-DO NOT USE!
+04.0  112    65.50   3371    3280   75162  14158    100.0    0.943  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba    107    63.00   3280    3105   68634  13817    100.0    0.985  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba    107    63.00   3156    2876   59031  14202     99.5    1.048  ! Near Maximum !


Much Thanks. The text wraps kind of funny, if I’m reading it right 61.0 grains is producing 55953 psi?


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Interesting data. FWIW when I worked up a load for the 145ELDX, the velocities were not at all linear so I'm assuming the pressures were not linear either? I had a velocity "plateau" that went from about 59 to 61 grains where the average velocity only changed 75fps or so. I settled on 60.0 of RL26 for 3136fps.


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TomM1 Offline OP
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I have been using 59.0 grains with 150 Nosler Partitions and 150 Speer hot cores. Cases have been through enough reloadings that I feel comfortable with that one.

All published data I have found shows these loads as acceptable with the exception of Speer data, which is ultra conservative compared to others, 270 and RL26 specific.


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Originally Posted by TomM1
Originally Posted by antelope_sniper
The 129gr LRX is not included in the latest version of QL so I got as close as I could.

Keep in mind RL-26 acts like magic pixie dust in the .270 Winchester, or at least that's what all the published data and QL seems to indicate. I haven't had the opportunity to test it myself.

Code
Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 130, Barnes 'TTSX'BT 30276
Useable Case Capaci: 59.268 grain H2O = 3.848 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-26 *C

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.794% 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

-07.9   99    58.00   2920    2461   46358  13371     98.0    1.176
-07.1  100    58.50   2950    2513   47816  13469     98.4    1.160
-06.3  100    59.00   2981    2564   49326  13561     98.7    1.143
-05.6  101    59.50   3011    2617   50894  13646     98.9    1.126
-04.8  102    60.00   3041    2670   52518  13725     99.2    1.109
-04.0  103    60.50   3071    2723   54204  13797     99.4    1.093
-03.2  104    61.00   3102    2777   55953  13862     99.6    1.077  ! Near Maximum !
-02.4  105    61.50   3132    2831   57771  13919     99.7    1.062  ! Near Maximum !
-01.6  106    62.00   3162    2886   59657  13970     99.8    1.046  ! Near Maximum !
-00.8  106    62.50   3192    2941   61620  14012     99.9    1.031  ! Near Maximum !
+00.0  107    63.00   3222    2997   63659  14048    100.0    1.016  ! Near Maximum !
+00.8  108    63.50   3252    3053   65779  14075    100.0    1.001  !DANGEROUS LOAD-DO NOT USE!
+01.6  109    64.00   3282    3109   67985  14097    100.0    0.986  !DANGEROUS LOAD-DO NOT USE!
+02.4  110    64.50   3311    3165   70281  14119    100.0    0.971  !DANGEROUS LOAD-DO NOT USE!
+03.2  111    65.00   3341    3222   72671  14139    100.0    0.957  !DANGEROUS LOAD-DO NOT USE!
+04.0  112    65.50   3371    3280   75162  14158    100.0    0.943  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba    107    63.00   3280    3105   68634  13817    100.0    0.985  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba    107    63.00   3156    2876   59031  14202     99.5    1.048  ! Near Maximum !


Much Thanks. The text wraps kind of funny, if I’m reading it right 61.0 grains is producing 55953 psi?


Yes. That's the QL estimate.


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TomM1 Offline OP
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Thanks again.


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