338 Powder

I'm about ready to give up on IMR 4350 and the Hornady 250 Grain SP.

I shot one halfway decent load but have been unable to repeat it since with multiple attempts. The good group was fired in new factory brass and then resized, full length, and shot again using the same bullet and powder charge. The 7/8" group has not been repeatable and I'm thinking it was a fluke more than an indicator of accuracy or potential. I'm thinking of trying IMR 4831, H 4831, or IMR 7828. What say you all? I don't have much RL 22 and not likely to see any anytime soon.

Also, I don't crimp my rifle rounds but I have a friend, pulling his hair out and jumping up and down, that swears I need to crimp, even if just a light crimp, the .338 because of it's recoil. Any thoughts on this?
 
Vince, RL19, about 70-72 grains in a WW case with about any 250. It's worked real well in the past.
 
My .338 with 250 gr. liked a max load of H-4350 ,winchester brass and GM215.It would shoot moa all day long.225gr liked IMR-4350 better.None of my loads were ever crimped. Lee
 
I think I'll try IMR 4831 and 7828 next with the Hornady 250 Grain SP.
 
7828 should be real good with the 250's. My 250 PT load right now is using RL22, and runs just at 2800, so I have no complaints, but 7828 should be almost identical.

Cartridge : .338 Win Mag.
Bullet : .338, 250, Hornady SP 3335
Useable Case Capaci: 74.259 grain H2O = 4.822 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 7828 SSC

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 85 60.00 2171 2617 31023 8511 87.1 1.633
-18.0 87 61.50 2230 2760 33227 8813 88.6 1.587
-16.0 90 63.00 2289 2909 35598 9106 90.0 1.542
-14.0 92 64.50 2349 3062 38153 9388 91.4 1.495
-12.0 94 66.00 2409 3221 40909 9658 92.6 1.445
-10.0 96 67.50 2469 3384 43882 9914 93.8 1.398
-08.0 98 69.00 2530 3552 47099 10155 94.9 1.353
-06.0 100 70.50 2590 3725 50581 10379 95.9 1.309
-04.0 102 72.00 2651 3902 54357 10585 96.8 1.266
-02.0 105 73.50 2712 4084 58459 10772 97.6 1.225 ! Near Maximum !
+00.0 107 75.00 2774 4270 62920 10936 98.3 1.185 ! Near Maximum !
+02.0 109 76.50 2835 4461 67791 11078 98.9 1.147 !DANGEROUS LOAD-DO NOT USE!
+04.0 111 78.00 2896 4656 73112 11197 99.3 1.110 !DANGEROUS LOAD-DO NOT USE!
+06.0 113 79.50 2957 4855 78943 11289 99.7 1.074 !DANGEROUS LOAD-DO NOT USE!
+08.0 115 81.00 3018 5058 85350 11354 99.9 1.039 !DANGEROUS LOAD-DO NOT USE!
+10.0 117 82.50 3080 5265 92414 11392 100.0 1.005 !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 75.00 2914 4712 76673 10593 100.0 1.094 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 107 75.00 2581 3697 50985 10586 91.5 1.303
 
SJB358":1iyssm0n said:
7828 should be real good with the 250's. My 250 PT load right now is using RL22, and runs just at 2800, so I have no complaints, but 7828 should be almost identical.

Cartridge : .338 Win Mag.
Bullet : .338, 250, Hornady SP 3335
Useable Case Capaci: 74.259 grain H2O = 4.822 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 7828 SSC

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 85 60.00 2171 2617 31023 8511 87.1 1.633
-18.0 87 61.50 2230 2760 33227 8813 88.6 1.587
-16.0 90 63.00 2289 2909 35598 9106 90.0 1.542
-14.0 92 64.50 2349 3062 38153 9388 91.4 1.495
-12.0 94 66.00 2409 3221 40909 9658 92.6 1.445
-10.0 96 67.50 2469 3384 43882 9914 93.8 1.398
-08.0 98 69.00 2530 3552 47099 10155 94.9 1.353
-06.0 100 70.50 2590 3725 50581 10379 95.9 1.309
-04.0 102 72.00 2651 3902 54357 10585 96.8 1.266
-02.0 105 73.50 2712 4084 58459 10772 97.6 1.225 ! Near Maximum !
+00.0 107 75.00 2774 4270 62920 10936 98.3 1.185 ! Near Maximum !
+02.0 109 76.50 2835 4461 67791 11078 98.9 1.147 !DANGEROUS LOAD-DO NOT USE!
+04.0 111 78.00 2896 4656 73112 11197 99.3 1.110 !DANGEROUS LOAD-DO NOT USE!
+06.0 113 79.50 2957 4855 78943 11289 99.7 1.074 !DANGEROUS LOAD-DO NOT USE!
+08.0 115 81.00 3018 5058 85350 11354 99.9 1.039 !DANGEROUS LOAD-DO NOT USE!
+10.0 117 82.50 3080 5265 92414 11392 100.0 1.005 !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 75.00 2914 4712 76673 10593 100.0 1.094 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 107 75.00 2581 3697 50985 10586 91.5 1.303
Click to expand...

Don't suppose you could run the same QL data but with H4350 could you SJB? I just acquired some 250g Interlocks and keen to try them with either that or H4831SC?

Thanks if possible!

- Bob
 
Cartridge : .338 Win Mag.
Bullet : .338, 250, Hornady SP 3335
Useable Case Capaci: 74.259 grain H2O = 4.822 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H4350

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 82 54.80 2168 2609 33965 7747 93.1 1.606
-18.0 84 56.17 2218 2732 36176 7968 94.1 1.563
-16.0 86 57.54 2269 2857 38502 8181 95.0 1.517
-14.0 88 58.91 2319 2985 40960 8385 95.8 1.474
-12.0 90 60.28 2369 3115 43570 8581 96.6 1.432
-10.0 92 61.65 2419 3248 46342 8766 97.3 1.392
-08.0 94 63.02 2468 3382 49287 8941 97.9 1.353
-06.0 96 64.39 2518 3519 52418 9104 98.4 1.315
-04.0 98 65.76 2567 3659 55747 9256 98.9 1.279 ! Near Maximum !
-02.0 100 67.13 2616 3800 59289 9394 99.2 1.244 ! Near Maximum !
+00.0 102 68.50 2665 3943 63061 9520 99.6 1.210 ! Near Maximum !
+02.0 104 69.87 2714 4088 67080 9632 99.8 1.178 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 71.24 2762 4234 71367 9729 99.9 1.147 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 72.61 2810 4383 75945 9812 100.0 1.117 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 73.98 2857 4532 80837 9881 100.0 1.087 !DANGEROUS LOAD-DO NOT USE!
+10.0 113 75.35 2905 4684 86073 9947 100.0 1.059 !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 68.50 2761 4232 73966 9185 100.0 1.134 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 68.50 2528 3548 52346 9473 95.6 1.311



Cartridge : .338 Win Mag.
Bullet : .338, 250, Hornady SP 3335
Useable Case Capaci: 74.259 grain H2O = 4.822 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H4831 SC

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 85 58.80 2138 2538 31623 7932 87.1 1.635
-18.0 87 60.27 2193 2671 33833 8202 88.5 1.589
-16.0 89 61.74 2249 2808 36204 8465 89.7 1.544
-14.0 91 63.21 2305 2949 38761 8721 91.0 1.496
-12.0 93 64.68 2361 3095 41506 8969 92.1 1.449
-10.0 96 66.15 2418 3245 44462 9207 93.2 1.403
-08.0 98 67.62 2475 3399 47651 9434 94.3 1.359
-06.0 100 69.09 2531 3557 51095 9649 95.2 1.316
-04.0 102 70.56 2589 3720 54816 9851 96.1 1.275
-02.0 104 72.03 2646 3886 58850 10040 96.9 1.235 ! Near Maximum !
+00.0 106 73.50 2703 4057 63224 10213 97.6 1.197 ! Near Maximum !
+02.0 108 74.97 2761 4232 67978 10369 98.2 1.159 !DANGEROUS LOAD-DO NOT USE!
+04.0 110 76.44 2819 4410 73155 10509 98.7 1.123 !DANGEROUS LOAD-DO NOT USE!
+06.0 113 77.91 2877 4593 78811 10629 99.2 1.088 !DANGEROUS LOAD-DO NOT USE!
+08.0 115 79.38 2934 4780 84993 10729 99.5 1.055 !DANGEROUS LOAD-DO NOT USE!
+10.0 117 80.85 2992 4971 91745 10809 99.8 1.022 !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 106 73.50 2831 4450 76001 10065 100.0 1.111 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 106 73.50 2533 3561 51606 9841 91.1 1.307
 
Thank you Scotty.
I was really debating if I should go with 7828 or 4831 given that I'm shooting a 250 grain bullet. I was leaning towards the 7828 and will give it a try on Monday. I'm going to keep my fingers crossed. I'll try the 4831 with the 200 Grain Accubonds.
 
Loaded up some 7828 today and hoping to hit the range in the morning.
 
R-19 is THE powder in the 338WM, especially with the lighter bullets (210/225gr).
just my .02.
sbsmith
 
I have some Reloader 22 but R 19 is nigh impossible to acquire.
From what I understand their focus is on making powder for the manufacturers and leaving us consumers out in the cold. That don't give me the warm fuzzies and if this ammo drought ever ends I'll be sure and remember that when I'm looking for powder.
 
Vince RL22 will work real well with 250's. I bet you get up over 2700 without an issue and mine is real accurate with it and 250 PTs. I also use 22 for the 275's.
 
I don't have enough Reloader 22 to work up loads and keep my stocked for the next two years. I do have enough of 7828 and 4831, I think. Thanks Scott. :)

EDIT TO ADD: I didn't make the range today due to weather. We finally got a little rain and with it came wind gust. I'll wait until conditions are better since I'm trying to work up a load.
 
I'm about to give up on the 250 grain bullets.
Shot close to 100 of them and only one group was acceptable but sadly not repeatable.
Will try a 200 grain AccuBond next with IMR 4831 and then 4350.
 
Vince":3hubnxaq said:
I'm about to give up on the 250 grain bullets.
Shot close to 100 of them and only one group was acceptable but sadly not repeatable.
Will try a 200 grain AccuBond next with IMR 4831 and then 4350.
Click to expand...


Maybe this has been brought up already on some other post and if so my apologizes but, have you check things on your rifle? Scope, mounts, correct torque of action screws ect....? I have owned many many 338 win mag and have never not seen one shoot 250 bullets well.

Just hate to see you give up on the 250's if there is some other possible cause.


Bill
 
I used to load H4831 with a 225 Partition in my .338 Win. Mag, I regret I sold that rifle when I started in college. That was the only Win. Mod70 I'd ever had and it shot extremely well.
 
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