7RUM Range Report

[Richracer1]

Well, I went out to sight in my new 7RUM today using a mild load of 83.5gn of RL-22 to push a 160AB. Granted the target was only at 50M, but the penny sized group shows some promise. It was to windy to move over to 100M.

 

[JD338]

Rich,

Looks like you are on your way. Congratulations.

JD338

 

[FOTIS]

Well, I went out to sight in my new 7RUM today using a mild load of 83.5gn of RL-22 to push a 160AB. Granted the target was only at 50M, but the penny sized group shows some promise. It was to windy to move over to 100M.

Sounds great!


Cartridge : 7 mm Rem Ultra Mag
Bullet : .284, 160, Nosler AccuBond 54932
Cartridge O.A.L. L6: 3.600 inch or 91.44 mm
Barrel Length : 26.0 inch or 660.4 mm
Powder : Alliant Reloder-22

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 71 66.80 2600 2401 36693 11733 98.5 1.705
-18.0 72 68.47 2657 2509 39076 11981 99.1 1.655
-16.0 74 70.14 2714 2617 41592 12206 99.5 1.606
-14.0 76 71.81 2770 2727 44246 12407 99.8 1.560
-12.0 78 73.48 2826 2837 47045 12582 100.0 1.515
-10.0 79 75.15 2880 2948 49996 12733 100.0 1.472
-08.0 81 76.82 2934 3059 53108 12875 100.0 1.431
-06.0 83 78.49 2987 3170 56388 13014 100.0 1.392 ! Near Maximum !
-04.0 85 80.16 3039 3281 59846 13151 100.0 1.354 ! Near Maximum !
-02.0 86 81.83 3090 3393 63493 13284 100.0 1.318 !DANGEROUS LOAD-DO NOT USE!
+00.0 88 83.50 3141 3505 67338 13414 100.0 1.283 !DANGEROUS LOAD-DO NOT USE!
+02.0 90 85.17 3191 3618 71394 13541 100.0 1.249 !DANGEROUS LOAD-DO NOT USE!
+04.0 92 86.84 3241 3731 75673 13665 100.0 1.217 !DANGEROUS LOAD-DO NOT USE!
+06.0 93 88.51 3290 3845 80190 13786 100.0 1.186 !DANGEROUS LOAD-DO NOT USE!
+08.0 95 90.18 3338 3959 84960 13903 100.0 1.156 !DANGEROUS LOAD-DO NOT USE!
+10.0 97 91.85 3386 4074 89998 14017 100.0 1.128 !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 88 83.50 3232 3712 78510 13075 100.0 1.197 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 88 83.50 3004 3206 55868 13883 99.9 1.399 ! Near Maximum !

 

[Richracer1]

That's interesting POP, as Alliant shows a 160gn Speer maxed out at 87gn of RL-22 for the 7RUM.

I don't plan on using RL-22, I have loads made for the 150ET & 160AB using Retumbo. I'm just using the RL-22 to sight in and get some rounds through the barrel.