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Joined: Jun 2009
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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?
Stuck in airports, Terrorized Sent to meetings, Hypnotized Over-exposed, Commercialized Handle me with Care... -Traveling Wilbury's
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Joined: Oct 2013
Posts: 244
Campfire Member
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Campfire Member
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Quickload will do it and quite accurately if you input numbers are accurate.
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Joined: Jan 2010
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Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2010
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How does the velocity compare to the same bullet using other powders?
P
Obey lawful commands. Video interactions. Hold bad cops accountable. Problem solved.
~Molɔ̀ːn Labé Skýla~
Member #547 Join date 3/09/2001
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Joined: Jun 2009
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Campfire Tracker
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OP
Campfire Tracker
Joined: Jun 2009
Posts: 3,188 |
How does the velocity compare to the same bullet using other powders?
P 60 grains of H4831SC nets about 80 fps less
Stuck in airports, Terrorized Sent to meetings, Hypnotized Over-exposed, Commercialized Handle me with Care... -Traveling Wilbury's
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Joined: Nov 2011
Posts: 31,250 Likes: 12
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,250 Likes: 12 |
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.
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 !
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Campfire Tracker
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Campfire Tracker
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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.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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Joined: Jun 2009
Posts: 3,188
Campfire Tracker
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OP
Campfire Tracker
Joined: Jun 2009
Posts: 3,188 |
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.
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?
Stuck in airports, Terrorized Sent to meetings, Hypnotized Over-exposed, Commercialized Handle me with Care... -Traveling Wilbury's
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Campfire Tracker
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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.
I am continually astounded at how quickly people make up their minds on little evidence or none at all. Jack O'Connor
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Joined: Jun 2009
Posts: 3,188
Campfire Tracker
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OP
Campfire Tracker
Joined: Jun 2009
Posts: 3,188 |
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.
Stuck in airports, Terrorized Sent to meetings, Hypnotized Over-exposed, Commercialized Handle me with Care... -Traveling Wilbury's
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Joined: Nov 2011
Posts: 31,250 Likes: 12
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,250 Likes: 12 |
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.
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.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Posts: 3,188
Campfire Tracker
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OP
Campfire Tracker
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Posts: 3,188 |
Stuck in airports, Terrorized Sent to meetings, Hypnotized Over-exposed, Commercialized Handle me with Care... -Traveling Wilbury's
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