375 RUM Shooting

[Richracer1]

I finally got some decent weather to go site in my 375RUM using 300PT and 93gn of H4832SC. It's good to go at 50M, will sight in at 100M another day. All I can say is OMG! :shock: This thing's got recoil, but not bad enough I'd put a brake on it. I'm waiting for my G-Smith to come to town so I can have him do a trigger job on this rifle and my 7mmRUM.

 

[FOTIS]

Good deal!


Cartridge : .375 Rem Ultra Mag
Bullet : .375, 300, Nosler PART SP 44845
Cartridge O.A.L. L6: 3.600 inch or 91.44 mm
Barrel Length : 26.0 inch or 660.4 mm
Powder : Hodgdon H4831 SC

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 89 83.70 2413 3879 40491 8502 93.9 1.543
-09.0 90 84.63 2440 3966 41838 8604 94.4 1.520
-08.0 91 85.56 2467 4054 43232 8703 94.9 1.497
-07.0 92 86.49 2494 4143 44675 8800 95.3 1.475
-06.0 93 87.42 2521 4232 46170 8894 95.8 1.453
-05.0 94 88.35 2547 4323 47719 8985 96.2 1.431
-04.0 95 89.28 2574 4415 49323 9074 96.6 1.410
-03.0 96 90.21 2601 4507 50987 9159 97.0 1.389
-02.0 97 91.14 2628 4601 52710 9240 97.3 1.369
-01.0 98 92.07 2655 4695 54497 9319 97.6 1.349 ! Near Maximum !
+00.0 99 93.00 2682 4790 56352 9394 98.0 1.329 ! Near Maximum !
+01.0 100 93.93 2708 4886 58273 9465 98.2 1.310 ! Near Maximum !
+02.0 101 94.86 2735 4983 60273 9533 98.5 1.291 ! Near Maximum !
+03.0 102 95.79 2762 5081 62340 9597 98.8 1.272 ! Near Maximum !
+04.0 103 96.72 2789 5180 64479 9658 99.0 1.254 !DANGEROUS LOAD-DO NOT USE!
+05.0 104 97.65 2815 5279 66693 9714 99.2 1.236 !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 99 93.00 2805 5241 67357 9233 100.0 1.235 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 93.00 2516 4218 46063 9081 91.8 1.451

 

[bullet]

I bet it does have some recoil but man that is one powerful cartridge for some serious work. Glad you like it and that shooting went well.

 

[Richracer1]

As mentioned, the load was (Nosler's listed min for 4831) made just to sight in the scope and get some bullets through the barrel before I start developing loads for. Still, propelling a 300gn projectile out of a barrel at around 2700 fps is impressive, at least to me.

 

[JD338]

Rich,

Congratulations on your maiden voyage with the 375 RUM.

JD338

 

[Richracer1]

Thanks POP/JD, the two shots I took off-hand just to see how much this thing would thump was .......... well, I got a big kick out of it.

Sorry about the pun, but I had too.

 

[Greg Nolan]

Richrader1

It shoots real nice with 260 gr. accubonds at 3080 fps and 5500 fpe. You may not need the 300 grs and the additional pounding. I haven't. Watching elk go "bang flop" is pretty impressive.
Good Hunting
Elkhunt :grin:

 

[Richracer1]

Richrader1

It shoots real nice with 260 gr. accubonds at 3080 fps and 5500 fpe. You may not need the 300 grs and the additional pounding. I haven't. Watching elk go "bang flop" is pretty impressive.
Good Hunting
Elkhunt :grin:

I'm using these cause they were cheap, Nolser 2nds at 25.00 a bag. I already have 260 and 300ABs loaded up for future testing using IMR-4350.

 

[TRIC]

Rich, Greg is right on..bang-flop is very impresssive. I'm loading 94 grs of H4350 behind the 300 PT. I don't mind the shoulder thump, but the others at the range I visit sure do complain about the muzzle blast. Seem to clear benches on either side of me every time I take my big RUM out...

 

[Greg Nolan]

TRIC
Aint it wonderfull :grin:

 

[Greg Nolan]

Richracer1
I found RL25 did the trick with the lowest pressure on the 260 gr. IMR4350 is my favorite all around powder but it's a little fast for me on the big Ultra mags. I find that the fuller I can get the case when I reach the velocity I want the less problems I have with pressure. It may cost a little more powder but I don't have to worry about a quarter of a grain more being enough to seize the action as with faster powders with a sharper spike. Just my take on why I've said Oh ____! a few times. :roll:
Greg

 

[Idaho_Elk_Huntr]

When I moved to Idaho I bought myself a gift of 4 Remington Ultra mags. All are the custom shop APR's and all shoot sub moa. Found out real fast like that the 7 was plenty for anything around here. All my loads for these rifles are with Fed 215's and IMR 7828 ssc. For me its the cats meow in these rifles

 

[FOTIS]

When I moved to Idaho I bought myself a gift of 4 Remington Ultra mags. All are the custom shop APR's and all shoot sub moa. Found out real fast like that the 7 was plenty for anything around here. All my loads for these rifles are with Fed 215's and IMR 7828 ssc. For me its the cats meow in these rifles

Give us some examples. Bullet load velocity accuracy. :twisted:

 

[Richracer1]

When I moved to Idaho I bought myself a gift of 4 Remington Ultra mags. All are the custom shop APR's and all shoot sub moa. Found out real fast like that the 7 was plenty for anything around here. All my loads for these rifles are with Fed 215's and IMR 7828 ssc. For me its the cats meow in these rifles

Am I correct to assume you bought all 4 RUM calibers in the APR rifles? That is way cool. We need some pics of your RUM family. Mine is here some where in a previous thread.

 

[JD338]

Thats awesome guys! You two can start the RUM Club. :lol:

Idaho_Elk_Huntr, post some pictures of your RUM's. :grin:

I'm hoping my daughters boyfriend decides to sell his 700 LSS 7mm RUM. :wink:

JD338