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Min-Max pressures for 7mag
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Wondering if anyone has minimum and maximum load data at their fingertips for the following components. Rem 700 in 7 rem mag with 26" barrel. Using 168gr. Sierra Matchkings and Retumbo powder with CCI 250 primers. My manual lists a minimum at 69.0 grains with a maximum of 71.1 grains. Does anyone have a currently published manual that lists numbers for these components. I'd like to do some comparisons without buying 5 manualsSmiler
 
Posts: 66 | Registered: 05 August 2009Reply With Quote
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Here is what Hodgdon shows for a 170gr
170 GR. SIE RN Hodgdon Retumbo .284" 3.270" 71.0 2752 44,200 CUP 75.0C 2899 50,700 CUP
That is 75 grs compressed for 50,700cup

QL works out as follows.
Cartridge : 7 mm Rem. Mag.
Bullet : .284, 168, Sierra HPBT MatchK 1930
Useable Case Capaci: 73.864 grain H2O = 4.796 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Hodgdon Retumbo

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 97 66.60 2738 2796 40789 11862 99.4 1.516
-09.0 98 67.34 2770 2863 42245 11950 99.6 1.491
-08.0 99 68.08 2803 2931 43761 12030 99.8 1.466
-07.0 101 68.82 2835 2999 45335 12100 99.9 1.442
-06.0 102 69.56 2868 3068 46973 12160 100.0 1.418
-05.0 103 70.30 2900 3137 48676 12211 100.0 1.395
-04.0 104 71.04 2932 3207 50448 12259 100.0 1.371
-03.0 105 71.78 2964 3277 52293 12305 100.0 1.349
-02.0 106 72.52 2996 3347 54213 12350 100.0 1.327 ! Near Maximum !
-01.0 107 73.26 3027 3418 56216 12395 100.0 1.305 ! Near Maximum !
+00.0 108 74.00 3058 3489 58301 12438 100.0 1.283 ! Near Maximum !
+01.0 109 74.74 3090 3561 60475 12480 100.0 1.262 ! Near Maximum !
+02.0 110 75.48 3121 3633 62741 12521 100.0 1.242 !DANGEROUS LOAD-DO NOT USE!
+03.0 111 76.22 3152 3705 65106 12560 100.0 1.222 !DANGEROUS LOAD-DO NOT USE!
+04.0 112 76.96 3183 3778 67574 12598 100.0 1.202 !DANGEROUS LOAD-DO NOT USE!
+05.0 113 77.70 3213 3852 70152 12635 100.0 1.182 !DANGEROUS LOAD-DO NOT USE!

As you can see 71 grs is around 105% capacity. Some manuals stop there. 75grs is 110%.


As usual just my $.02
Paul K
 
Posts: 12881 | Location: Mexico, MO | Registered: 02 April 2001Reply With Quote
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