I got a friend in north Texas that has told me some hard to believe info on this wildcat. Wanted to know if any of it is true. 50 degree shoulder on a RUM case. 3850 fps on a 168gr and still supersonic at 2800yds.

Is the velocity true? that would be crazy!!

Inquiring minds want to know!!

In a word No. Unless I'm realling missing something a 30-378 is far larger than anything you can do with a Rum case. Wby calls it 3500 with a 165. Loadtech says It could be done with a 30-378 with 130grs of 8700 and a 35" barrel. Even if you take a Sierra match bullet for high BC it is subsonic at around half that distance.

Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft•lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 3808.7 3.411 5410.3 0.000 0.0 ***
100 -0.0 -0.0 0.5 0.5 3556.0 3.185 4716.4 0.082 14.3 13.7
200 -1.3 -0.6 2.0 1.0 3318.2 2.972 4106.5 0.169 29.7 14.2
300 -5.7 -1.8 4.6 1.5 3093.3 2.771 3568.8 0.263 46.2 14.7
400 -13.7 -3.3 8.4 2.0 2879.8 2.579 3093.2 0.363 63.9 15.3
500 -26.0 -5.0 13.6 2.6 2676.4 2.397 2671.7 0.471 82.9 15.8
600 -43.1 -6.9 20.2 3.2 2478.1 2.220 2290.5 0.588 103.4 16.5
700 -65.9 -9.0 28.6 3.9 2286.0 2.048 1949.2 0.714 125.6 17.1
800 -95.3 -11.4 38.8 4.6 2102.4 1.883 1648.6 0.850 149.7 17.9
900 -132.7 -14.1 51.2 5.4 1918.5 1.718 1372.8 1.000 176.0 18.7
1000 -179.5 -17.1 66.2 6.3 1745.1 1.563 1135.8 1.164 204.8 19.6
1100 -237.8 -20.6 84.1 7.3 1583.0 1.418 934.7 1.344 236.6 20.5
1200 -310.0 -24.7 105.4 8.4 1429.5 1.280 762.2 1.544 271.7 21.6
1300 -399.3 -29.3 130.4 9.6 1294.6 1.160 625.1 1.765 310.6 22.8
1400 -509.3 -34.7 159.3 10.9 1181.9 1.059 521.0 2.008 353.4 24.1
1500 -644.3 -41.0 192.0 12.2 1093.9 0.980 446.3 2.272 399.9 25.5
1600 -808.3 -48.2 228.0 13.6 1027.6 0.920 393.9 2.556 449.8 26.8
1700 -1005.4 -56.5 267.0 15.0 975.8 0.874 355.1 2.856 502.7 28.2
1800 -1239.0 -65.7 308.6 16.4 932.9 0.836 324.6 3.171 558.2 29.6
1900 -1512.7 -76.0 352.7 17.7 896.0 0.802 299.4 3.501 616.1 31.0
2000 -1830.1 -87.4 399.1 19.1 863.1 0.773 277.8 3.843 676.4 32.3
2100 -2194.5 -99.8 447.9 20.4 833.3 0.746 259.0 4.199 739.0 33.6
2200 -2609.5 -113.3 498.9 21.7 805.9 0.722 242.2 4.567 803.9 34.9
2300 -3078.9 -127.8 552.2 22.9 780.4 0.699 227.1 4.949 871.0 36.2
2400 -3606.5 -143.5 607.8 24.2 756.4 0.678 213.4 5.344 940.5 37.4
2500 -4196.3 -160.3 665.8 25.4 733.8 0.657 200.8 5.752 1012.3 38.7
2600 -4852.6 -178.2 726.2 26.7 712.5 0.638 189.3 6.174 1086.6 39.9
2700 -5579.9 -197.3 789.0 27.9 692.3 0.620 178.8 6.610 1163.3 41.1
2800 -6383.0 -217.7 854.4 29.1 673.3 0.603 169.1 7.060 1242.6 42.4

About 7 or 8 years ago i had 2 longrange rifles in my shop to bed. One had been chambered in 338/378 Wby., and the other in 300/378 Wby., both had 50 degree shoulders. I asked the owner if he ever had trouble with collapsing shoulders. He replied "No". When he brought me a couple of "dummy" rounds, for my collection, both cases had severely dimpled and cracked shoulders. There was indication of fire-splitting of the shoulder. I believe that anything over 40 degrees is "running on the edge".

From a RUM Case...???

NO WAY !!
See to compare a .300Lapua Mag :

168grs. SMK moly
88,4grs. VV-N-160
34" BBL
will give you 3491 fps. OK.....

BUT thats at the max. allowed Pressure of that Case....68168psi ( lot higher than RUM´S )

I ´don´t know if it would be possible at max. proove-house pressure at about 88.000psi, but two things for shure :
poor barrel life,
and one-shot-cases

Best
2RECON

If you have a folding chrono, and make it 1" from flat, you can certainly get a couple FPS faster...

3800 fps? Not even from a BMG case.. and no CONVENTIONAL bullets would survive leaving the barrel...

but, of course, thos enumbers are from someone without a chrono, adding on to someone else's misremembered figures, and of course, a self guiding bullet that has never failed to drop 160+ BC points off a hog

Thanks for the info gang. My friend has sometimes more money than sense, and I hate to see him get taken. I have seen some extraordinary velocities from RBCD ammo, but with light for caliber projectiles and would expect them to lose velocity rapidly.

Andy B