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Joined: Nov 2009
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I just picked up a new 7mm Rem and have some MagPro - any pet loads out there? 24" tube and I'm leaning toward either 140gr Accubonds or TTSX.

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Hornady manual shows good velocity w/ 139 gr bullets.

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A lot of the data I've looked at shows the velocities up in the realm of what I'd expect from H1000 or Retumbo. I grabbed some 139 gr BTSPs and WW brass so hopefully I can go try it out this weekend. Looks promising if the accuracy is there.

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Still interested if anyone has tried this combo. 1:9.5" twist.

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Western Powders 5.0 load data shows the 139gr BTSP in 7mm RM with MagPro.

Code
Bullet	Bullet	Bullet	Start	Start	Max	Max	Max		COAL
Weight	Make	Type	Charge	Vel.	Charge	Vel	Pressure
139	 HDY	BTSP	 68.3	 2,921	75.8	3,207	60,689		 3.230


Since no one has responded with personal experience with that combo, why not give it a try and report back with your own?

Seems like it could be a fine match.


“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear
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I have used it in 7WSM but thought it was too slow that that application. Much better with 180s. It is also great with 140s in 6.5-284.


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Magpro worked real good in my 7mm WSM and Rem Mag's with the heavier 160's and 168's but I haven't tried it with 140's. Case fill looks pretty good and speeds are pretty good too. I'd give it a shot.


Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 140, Nosler AccuBond 59992
Useable Case Capaci: 74.204 grain H2O = 4.818 cm�
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Accurate MAGPRO

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 82 59.44 2538 2002 30652 10854 84.0 1.537
-18.0 84 60.93 2608 2114 32889 11264 85.7 1.496
-16.0 86 62.41 2679 2231 35302 11666 87.3 1.454
-14.0 88 63.90 2751 2352 37907 12057 88.8 1.411
-12.0 90 65.38 2823 2477 40719 12435 90.2 1.364
-10.0 92 66.87 2895 2606 43759 12799 91.6 1.318
-08.0 94 68.36 2968 2738 47048 13146 92.9 1.274
-06.0 96 69.84 3041 2875 50589 13475 94.1 1.232
-04.0 98 71.33 3115 3016 54383 13783 95.2 1.191
-02.0 100 72.81 3188 3160 58474 14069 96.2 1.152 ! Near Maximum !
+00.0 102 74.30 3262 3307 62894 14330 97.1 1.114 ! Near Maximum !
+02.0 104 75.79 3336 3459 67676 14564 97.8 1.077 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 77.27 3409 3613 72855 14770 98.5 1.042 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 78.76 3483 3771 78473 14946 99.0 1.008 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 80.24 3557 3932 84578 15090 99.5 0.974 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 81.73 3630 4096 91227 15199 99.8 0.942 !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 102 74.30 3443 3686 76968 14202 99.9 1.021 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 74.30 3021 2838 49586 13619 89.4 1.235

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 140, Barnes 'TTSX'BT 28474
Useable Case Capaci: 73.117 grain H2O = 4.747 cm�
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Accurate MAGPRO

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 82 58.40 2533 1994 31020 10635 84.0 1.510
-18.0 84 59.86 2601 2104 33204 11032 85.6 1.471
-16.0 86 61.32 2671 2217 35555 11421 87.1 1.432
-14.0 88 62.78 2741 2335 38091 11801 88.6 1.394
-12.0 90 64.24 2811 2456 40826 12169 90.0 1.357
-10.0 92 65.70 2882 2582 43780 12525 91.4 1.320
-08.0 94 67.16 2953 2711 46965 12865 92.7 1.280
-06.0 96 68.62 3025 2844 50425 13189 93.8 1.237
-04.0 98 70.08 3097 2981 54124 13493 94.9 1.197
-02.0 100 71.54 3169 3122 58092 13777 95.9 1.158 ! Near Maximum !
+00.0 102 73.00 3241 3266 62377 14038 96.8 1.121 ! Near Maximum !
+02.0 104 74.46 3314 3413 67011 14275 97.6 1.085 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 75.92 3386 3565 72028 14485 98.3 1.050 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 77.38 3459 3719 77467 14666 98.9 1.015 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 78.84 3531 3877 83376 14818 99.3 0.983 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 80.30 3604 4038 89807 14937 99.7 0.951 !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 102 73.00 3422 3641 76134 13953 99.9 1.028 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 73.00 3003 2804 49385 13314 89.1 1.242


Semper Fi
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Thanks for the feedback guys. I loaded some up but haven't been able to shoot when the weather is right. I'll post results once I have some.


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