QL 375 RUM

[frankm]

Would someone be so kind to run a couple powder and bullet combos for me on 375 Rem Ultra Mag? Finding data is difficult at best and it seems to have much variation.

Haven't had my rifle out for a number ofvyearscandvwantvto start playing with it again.

Here's where I m going based on components already in hand :

375 RUM
Fed 215M
3.575 OAL s
65,000 psi max. ( not that I ll load that hot but just to know an estimate of the top end. )

2 bullets I have are 270 gr Hornady spire point. #3710
300 gr Sierra GL

2 powders to try with both bullets
R22
IMR4831

So 4 total QL s please??
Thx for any help cause as previously mentioned not a lot of data out there and lots of variation in the different sources.

 

[frankm]

Sorry forgot it s a 24" barrel !

 

[DrMike]

Cartridge          : .375 Rem Ultra Mag
Bullet             : .375, 270, Hornady SP 3710
Useable Case Capaci: 103.080 grain H2O = 6.693 cm³
Cartridge O.A.L. L6: 3.575 inch = 90.81 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4831

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   93    84.78   2599    4049   46494   9465     99.6    1.348
-09.0   94    85.72   2625    4131   48027   9529     99.8    1.328
-08.0   95    86.66   2651    4214   49610   9589     99.9    1.308
-07.0   96    87.61   2677    4297   51243   9644     99.9    1.289
-06.0   97    88.55   2703    4380   52929   9694    100.0    1.270
-05.0   98    89.49   2729    4464   54669   9740    100.0    1.252
-04.0   99    90.43   2754    4548   56465   9782    100.0    1.234  ! Near Maximum !
-03.0  100    91.37   2780    4632   58319   9823    100.0    1.216  ! Near Maximum !
-02.0  101    92.32   2805    4716   60233   9864    100.0    1.199  ! Near Maximum !
-01.0  102    93.26   2830    4801   62210   9904    100.0    1.182  ! Near Maximum !
+00.0  104    94.20   2855    4886   64252   9943    100.0    1.165  ! Near Maximum !
+01.0  105    95.14   2880    4971   66362   9981    100.0    1.149  !DANGEROUS LOAD-DO NOT USE!
+02.0  106    96.08   2904    5057   68542  10019    100.0    1.133  !DANGEROUS LOAD-DO NOT USE!
+03.0  107    97.03   2929    5143   70795  10056    100.0    1.117  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    97.97   2953    5229   73124  10092    100.0    1.101  !DANGEROUS LOAD-DO NOT USE!
+05.0  109    98.91   2978    5316   75533  10128    100.0    1.086  !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    104    94.20   2947    5206   76574   9580    100.0    1.085  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    94.20   2714    4415   52041  10295     98.8    1.274

Cartridge          : .375 Rem Ultra Mag
Bullet             : .375, 270, Hornady SP 3710
Useable Case Capaci: 103.080 grain H2O = 6.693 cm³
Cartridge O.A.L. L6: 3.575 inch = 90.81 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-22

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   96    92.43   2633    4158   44758  10587     96.0    1.346
-09.0   97    93.46   2664    4255   46377  10703     96.4    1.324
-08.0   98    94.48   2695    4354   48059  10814     96.9    1.303
-07.0   99    95.51   2726    4455   49807  10920     97.3    1.282
-06.0  100    96.54   2757    4556   51626  11022     97.7    1.261
-05.0  102    97.57   2787    4658   53519  11118     98.0    1.241
-04.0  103    98.59   2818    4761   55487  11209     98.4    1.221  ! Near Maximum !
-03.0  104    99.62   2849    4865   57539  11294     98.7    1.202  ! Near Maximum !
-02.0  105   100.65   2879    4970   59672  11374     98.9    1.182  ! Near Maximum !
-01.0  106   101.67   2910    5076   61883  11447     99.2    1.164  ! Near Maximum !
+00.0  107   102.70   2940    5183   64174  11515     99.4    1.145  ! Near Maximum !
+01.0  108   103.73   2971    5291   66554  11577     99.6    1.127  !DANGEROUS LOAD-DO NOT USE!
+02.0  109   104.75   3001    5399   69031  11633     99.7    1.109  !DANGEROUS LOAD-DO NOT USE!
+03.0  110   105.78   3031    5509   71608  11682     99.8    1.092  !DANGEROUS LOAD-DO NOT USE!
+04.0  111   106.81   3061    5619   74290  11725     99.9    1.075  !DANGEROUS LOAD-DO NOT USE!
+05.0  112   107.84   3091    5730   77083  11760    100.0    1.058  !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    107   102.70   3074    5664   78259  11090    100.0    1.057  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    107   102.70   2750    4534   51060  11335     94.2    1.262

 

[DrMike]

Cartridge          : .375 Rem Ultra Mag
Bullet             : .375, 300, Sierra SPBT 3000
Useable Case Capaci: 100.018 grain H2O = 6.494 cm³
Cartridge O.A.L. L6: 3.575 inch = 90.81 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-22

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   95    88.20   2511    4202   44868  10336     97.1    1.409
-09.0   96    89.18   2540    4298   46462  10442     97.5    1.386
-08.0   97    90.16   2569    4395   48116  10542     97.8    1.364
-07.0   98    91.14   2597    4493   49834  10638     98.2    1.343
-06.0   99    92.12   2625    4592   51619  10729     98.5    1.322
-05.0  100    93.10   2654    4691   53475  10816     98.8    1.301
-04.0  101    94.08   2682    4792   55394  10897     99.0    1.281  ! Near Maximum !
-03.0  102    95.06   2710    4893   57378  10973     99.2    1.261  ! Near Maximum !
-02.0  103    96.04   2738    4996   59430  11043     99.4    1.241  ! Near Maximum !
-01.0  104    97.02   2767    5099   61560  11108     99.6    1.222  ! Near Maximum !
+00.0  105    98.00   2795    5202   63771  11167     99.7    1.203  ! Near Maximum !
+01.0  106    98.98   2823    5307   66066  11220     99.9    1.185  !DANGEROUS LOAD-DO NOT USE!
+02.0  107    99.96   2850    5412   68450  11268     99.9    1.166  !DANGEROUS LOAD-DO NOT USE!
+03.0  108   100.94   2878    5518   70927  11309    100.0    1.149  !DANGEROUS LOAD-DO NOT USE!
+04.0  109   101.92   2906    5625   73500  11344    100.0    1.131  !DANGEROUS LOAD-DO NOT USE!
+05.0  110   102.90   2933    5732   76176  11375    100.0    1.114  !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    105    98.00   2913    5653   77515  10716    100.0    1.113  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    105    98.00   2622    4580   50758  11116     95.4    1.324

Cartridge          : .375 Rem Ultra Mag
Bullet             : .375, 300, Sierra SPBT 3000
Useable Case Capaci: 100.018 grain H2O = 6.494 cm³
Cartridge O.A.L. L6: 3.575 inch = 90.81 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4831

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   91    80.37   2457    4022   45801   9085     99.9    1.423
-09.0   92    81.26   2481    4101   47269   9142     99.9    1.402
-08.0   93    82.16   2505    4181   48781   9194    100.0    1.382
-07.0   94    83.05   2529    4261   50340   9243    100.0    1.363
-06.0   95    83.94   2553    4341   51947   9289    100.0    1.343
-05.0   96    84.84   2576    4421   53602   9334    100.0    1.324
-04.0   97    85.73   2600    4502   55309   9378    100.0    1.306  ! Near Maximum !
-03.0   98    86.62   2623    4583   57069   9422    100.0    1.288  ! Near Maximum !
-02.0   99    87.51   2646    4664   58883   9466    100.0    1.270  ! Near Maximum !
-01.0  100    88.41   2669    4745   60754   9508    100.0    1.252  ! Near Maximum !
+00.0  101    89.30   2692    4827   62684   9550    100.0    1.235  ! Near Maximum !
+01.0  102    90.19   2715    4909   64674   9592    100.0    1.218  !DANGEROUS LOAD-DO NOT USE!
+02.0  103    91.09   2737    4991   66728   9632    100.0    1.202  !DANGEROUS LOAD-DO NOT USE!
+03.0  104    91.98   2760    5074   68847   9672    100.0    1.185  !DANGEROUS LOAD-DO NOT USE!
+04.0  105    92.87   2782    5157   71034   9711    100.0    1.169  !DANGEROUS LOAD-DO NOT USE!
+05.0  106    93.77   2805    5240   73291   9750    100.0    1.154  !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    101    89.30   2774    5127   74491   9213    100.0    1.152  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    101    89.30   2566    4385   50940   9937     99.3    1.348

 

[IdahoCTD]

QL tends to be low on velocity for all of the RUM cases so I would take those numbers with a grain of salt.

 

[frankm]

Thanks much Dr Mike, appreciate it.

Nathan, thx for note on QL. To this point I ve only shot R22 and have been a couple grs under what the QL forecast is showing for 62-63K of pressure. My velocities have been 100-150 fps less than the above QL s... maybe just a slow lot of powder.

Will chronograph loads while working up charges but 2900 fps with 270 s and 2700-2750 with 300 s
appears to be attainable from what I m seeing. In your experience Nathan did you get those velocities without excessive pressures?

Thx

 

[Thebear_78]

I’m loading H414 in my 375 RUM. Using both 260 AccuBond and 270 TSX.
I’m getting 3005fps with the 260 and 2950 with the 270 TSX 92.0 gr.


Sent from my iPhone using Tapatalk

 

[frankm]

That s some serious energy !! ( and recoil!)

I ve seen a couple comments that 4350 ( or something like H414) is the burn rate for best velocity. Probably depends on bullet weight some. Guessing the 250-270 s would like that rate. 300 s might lean to slightly slower stuff.

 

[IdahoCTD]

With the lighter bullets I think H4350 is a better powder for a 375RUM. I tried all of the slower powders and all I got was more recoil due to the higher charge weights. R-26 might give some good velocities and it would be something I'd try if I still had my 375RUM.

 

[FOTIS]

7828 IS YOUR HUCKLEBERRY!