338 RUM Load Data

[JakeSCH]

Anyone try N565 for their 338 RUM? I also have RL26 / RL23 (which I can find load data for) but I would prefer to use N565 at this point.

At this point I plan on using it for the 213 HH, 260 HH, and 300 Atips.

Does anyone see any major issues with starting at the 338 Lapua starting loads and working up to pressure?

 

[JimGa]

I wouldn't start at Lapua loads. In a 338 edge maybe, but not standard RUM. A pretty "standard" Edge load is 92.0 of H1000 with a 300 gr. SMK/Berger for reference.

 

[JakeSCH]

I wouldn't start at Lapua loads. In a 338 edge maybe, but not standard RUM. A pretty "standard" Edge load is 92.0 of H1000 with a 300 gr. SMK/Berger for reference.

Point taken, some powders have similar charge weights between the two (N560) while others don't (like H1000).

What I have found is a QL reference that shows similar charge weights between the two cartridges for N565 for 250 gr bullet class. Just wondering via extrapolation if since N560 has similar charge weights across bullet weights and N565 has similar charge weight for 1 bullet weight, if It would mostly likely be safe to start on the low end.

I plan on reaching out to nosler about it to see if they have any more info.

 

[Trippy]

Did you look at VV's website? I saw they don't have your specific bullets but similar weights with N565 in the tables.

 

[JakeSCH]

Did you look at VV's website? I saw they don't have your specific bullets but similar weights with N565 in the tables.

Yeah, their data is for the 338 Lapua but I am looking for 338 RUM.

 

[Trippy]

my bad, how long is your barrel?

 

[JakeSCH]

26"

 

[Trippy]

QL stats, verify the right values (case capacity, bullet length, etc.) and use at your own discretion.

213 grain HH



Cartridge : .338 Rem Ultra Mag
Bullet : .338, 250, Speer GrandSlam 2408
Useable Case Capaci: 92.622 grain H2O = 6.014 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N565 *C

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 86 75.76 2420 2770 30260 8975 88.9 1.694
-18.0 89 77.65 2486 2922 32576 9271 90.4 1.648
-16.0 91 79.55 2552 3079 35085 9554 91.8 1.603
-14.0 93 81.44 2618 3241 37805 9824 93.2 1.555
-12.0 95 83.34 2684 3407 40710 10079 94.4 1.503
-10.0 97 85.23 2750 3578 43829 10316 95.5 1.452
-08.0 99 87.12 2817 3753 47198 10535 96.5 1.404
-06.0 101 89.02 2883 3931 50839 10734 97.4 1.357
-04.0 104 90.91 2949 4114 54776 10911 98.1 1.312 ! Near Maximum !
-02.0 106 92.81 3015 4300 59040 11065 98.8 1.269 ! Near Maximum !
+00.0 108 94.70 3081 4490 63662 11195 99.3 1.227 !DANGEROUS LOAD-DO NOT USE!
+02.0 110 96.59 3146 4682 68679 11299 99.6 1.187 !DANGEROUS LOAD-DO NOT USE!
+04.0 112 98.49 3212 4878 74135 11376 99.9 1.148 !DANGEROUS LOAD-DO NOT USE!
+06.0 114 100.38 3276 5076 80078 11424 100.0 1.111 !DANGEROUS LOAD-DO NOT USE!
+08.0 117 102.28 3340 5277 86566 11450 100.0 1.074 !DANGEROUS LOAD-DO NOT USE!
+10.0 119 104.17 3404 5480 93664 11469 100.0 1.039 !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 108 94.70 3230 4933 78418 10755 100.0 1.126 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 108 94.70 2869 3893 49536 11009 93.7 1.363


260 grain HH



Cartridge : .338 Rem Ultra Mag
Bullet : .338, 250, Speer GrandSlam 2408
Useable Case Capaci: 88.124 grain H2O = 5.722 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N565 *C

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 84 69.92 2239 2894 31378 8853 92.6 1.824
-18.0 86 71.67 2297 3046 33691 9115 93.8 1.775
-16.0 88 73.42 2355 3202 36149 9363 94.9 1.727
-14.0 90 75.16 2413 3361 38784 9596 95.9 1.673
-12.0 92 76.91 2471 3524 41613 9814 96.9 1.619
-10.0 94 78.66 2528 3691 44651 10014 97.7 1.567
-08.0 96 80.41 2586 3860 47914 10197 98.3 1.516
-06.0 98 82.16 2643 4033 51421 10359 98.9 1.468
-04.0 101 83.90 2700 4209 55194 10501 99.4 1.422 ! Near Maximum !
-02.0 103 85.65 2757 4387 59256 10621 99.7 1.377 ! Near Maximum !
+00.0 105 87.40 2813 4568 63633 10718 99.9 1.334 !DANGEROUS LOAD-DO NOT USE!
+02.0 107 89.15 2869 4751 68356 10792 100.0 1.293 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 90.90 2924 4935 73458 10848 100.0 1.253 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 92.64 2979 5122 78978 10899 100.0 1.215 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 94.39 3033 5311 84961 10945 100.0 1.177 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 96.14 3087 5502 91457 10987 100.0 1.141 !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 87.40 2931 4960 77799 10238 100.0 1.229 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 87.40 2637 4015 49970 10785 96.1 1.476

300 A Tip



Cartridge : .338 Rem Ultra Mag
Bullet : .338, 250, Speer GrandSlam 2408
Useable Case Capaci: 86.717 grain H2O = 5.630 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N565 *C

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 81 66.72 2116 2982 32353 8800 95.1 1.925
-18.0 83 68.39 2168 3132 34630 9034 96.1 1.874
-16.0 85 70.06 2221 3285 37065 9255 97.0 1.824
-14.0 87 71.72 2273 3441 39667 9460 97.8 1.766
-12.0 89 73.39 2325 3600 42448 9649 98.4 1.711
-10.0 91 75.06 2376 3761 45421 9821 99.0 1.658
-08.0 93 76.73 2428 3925 48601 9975 99.4 1.606
-06.0 95 78.40 2478 4092 52002 10109 99.7 1.557
-04.0 98 80.06 2529 4260 55644 10223 99.9 1.510 ! Near Maximum !
-02.0 100 81.73 2579 4431 59545 10317 100.0 1.465 ! Near Maximum !
+00.0 102 83.40 2629 4603 63728 10394 100.0 1.421 !DANGEROUS LOAD-DO NOT USE!
+02.0 104 85.07 2678 4776 68217 10468 100.0 1.379 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 86.74 2726 4951 73039 10538 100.0 1.338 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 88.40 2775 5128 78227 10604 100.0 1.299 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 90.07 2823 5308 83815 10667 100.0 1.262 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 91.74 2870 5489 89843 10725 100.0 1.225 !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 102 83.40 2727 4953 77336 9954 100.0 1.314 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 83.40 2479 4094 50468 10666 97.7 1.567

 

[JakeSCH]

Well I have started off my ladder tests.

213 HH hit 3195 FPS with 90 gr of IMR 4955 w/o pressure

260 HH got 2957 fps with 88 gr of RL26 w/o pressure

I plan on pushing them up a big more. I will eventually try N565 on the 260's if RL26 shows high temp pressure spikes.

 

[JakeSCH]

Some updated load info for anyone who may be searching.

338 RUM - Lone Peak Ti with Carbon 6 barrel (26" and 1-9" twist)
260 Hammer Hunter
New ADG
Fed 215
1/4 FCD
RL 26
90.5 gr
3065
ES 7.0
SD 3.5
~1/3" groups @100y

 

[JakeSCH]

 

[Softtail103]

I run 91.5 grains of H1000 in my 338 Edge with a 300 Berger sitting on top.

 

[Geewhiz]

98 grains of LRT out of my rum with a 300 berger elite hunter.

 

[S.idahohunter]

I'm shooting an edge with a proof research barrel and attempted to shoot 88 grns of H1000 with a 300 grn berger. I had pressure signs first shot. Are you guys not seeing any pressure signs at 91? The proof barrel may also be slightly tighter???

 

[Softtail103]

Zero pressure signs. I run a Hart barrel.

 

[wind gypsy]

I'm shooting an edge with a proof research barrel and attempted to shoot 88 grns of H1000 with a 300 grn berger. I had pressure signs first shot. Are you guys not seeing any pressure signs at 91? The proof barrel may also be slightly tighter???

Is there significant variance in different brass mfr case capacities? To over generalize, Bertram/ADG/Peterson often have smaller case capacity than others.

 

[S.idahohunter]

I have Norma brass that I'm shooting but not sure if there should be that much variance. I have the bullet seated .010 off the lands too.