Pet Loads - 250 grain Partition - .338 Win Mag?

TBASTIAN · Dec 29, 2007

After about 14 different loads I'm still having a hard time finding a load that will shoot under an inch and a half using the 250 grain Partition, in my Browning A-Bolt SS, chambered in .338 Win Mag.

I have been using IMR 4350, H 4350, IMR 4831, RL 19, RL 22 and IMR 4064. I'm a bit frustrated as I currently have a load worked up for the 225 grain, Barnes TSX that consistently shoots around 3/4". I would really like to find a load for the Partition. Anyone out there have any pet loads that they wouldn't mind sharing, using any of the powders listed above? Thanks in advance!
-TB

FOTIS · Dec 29, 2007

Cartridge : .338 Win Mag.
Bullet : .338, 225, Nosler PART SP 16336
Cartridge O.A.L. L6: 3.340 inch or 84.84 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : Alliant Reloder-19

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 58.40 2235 2496 30300 8081 87.5 1.586
-18.0 86 59.86 2292 2624 32322 8355 88.8 1.544
-16.0 88 61.32 2348 2755 34480 8623 90.1 1.502
-14.0 90 62.78 2405 2889 36790 8883 91.3 1.462
-12.0 92 64.24 2462 3028 39257 9135 92.4 1.418
-10.0 94 65.70 2519 3170 41896 9378 93.5 1.375
-08.0 96 67.16 2576 3315 44724 9611 94.5 1.334
-06.0 99 68.62 2633 3464 47752 9833 95.4 1.294
-04.0 101 70.08 2690 3616 51001 10042 96.3 1.256
-02.0 103 71.54 2748 3772 54488 10238 97.0 1.219 ! Near Maximum !
+00.0 105 73.00 2805 3931 58237 10420 97.7 1.183 ! Near Maximum !
+02.0 107 74.46 2862 4093 62272 10586 98.3 1.149 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 75.92 2919 4258 66617 10737 98.8 1.115 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 77.38 2976 4426 71308 10870 99.2 1.083 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 78.84 3033 4597 76369 10986 99.5 1.051 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 80.30 3090 4771 81813 11083 99.8 1.021 !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 73.00 2939 4315 69966 10271 100.0 1.097 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 73.00 2626 3447 47554 10029 91.2 1.293

JD338 · Dec 29, 2007

TBASTIAN,

You are working with the right powders. You might try working with the COL to find the sweet spot in your rifle. It could also be that your rifle just doesn't like the 250 gr PT. Nothing wrong with using the 225 grPT, it will get the job done in your 338 Win Mag. :wink:

JD338

Alaska · Dec 30, 2007

338 Win

Reloader 19 @ 73.0
250 Nosler Part
WLR Primers
WW Cases

Reloader 19 @ 75.1 (Favorite load)
225gr Nosler Part or AccuBond
WLR Primers
WW Cases

Reloader 19 is a excellent powder for the 338 Win.

OU812 · Dec 30, 2007

My pet load for my 338wm is as follows.

250 grain NP
Remington cases
Fed 215 primer
71.5 grains of H4831sc
COL 3.330

TBASTIAN · Dec 31, 2007

Thanks to all. I will definitely be trying both of these suggested loads.
-TB

huntingmandan · Dec 31, 2007

TBASTIAN-

I sent you a PM as well

I am having the same problem with the very same rifle! .338 Browing SS...In fact, I have problems getting anything under 1.5 inches....here is what I have found so far for the 250 gr NP (which is the one i plan to use for everything)

250 gr NP
68.0 gr of IMR 4350
Fed 215 Primers
Seated to 3.345 inches
Average Velocity of 25 rounds is 2764 over my chrono

This load gives me the best accuracy, usually around 1-1.5 inches...if I make sure the barrel is cool!!!

Dan

LowBC · Jan 2, 2008

Alaska

How are you finding that load of 73grains with the 250grain PT. I have used this load with 225grain projectiles and it seems very mild in my rifle.

For anyones interest, I am using a tikka 595 continental with 24inch barrel. With RL19 the following were the chronographed results,

73 grains = 2,830fps
74 grains = 2,890fps
75 grains = 2,960fps

I know the velocities are getting up there, but I didn't have any visible signs of high pressure. The bolt wasn't sticky, the primers, whilst being flat, weren't cratering. The bullet in question was a hornady 225grain SST which Alliant recommends a max of 75.3grains (52,100c.u.p), whilst the 225grain Barnes has a maximum of 72 grains of RL19.

I would be interested in anyone's thoughts. Currently I am loading 72.5 grains of RL19 behind the 225grain SST for about 2,800fps. This is accurate in my rifle.

Regards
Matt

Alaska · Jan 2, 2008

I use the 225 AccuBond and 75.1 of Reloader 19.

I also use a WLR primer instead of Mag Primers which keeps pressure down. No problems with the WLR primers.

If you are getting good groups no animal can tell the difference between 2800 and 2900 Fps in the 338 Win.

I beleve you can increase your powder charge and switch to the WLR primer and improve your vel if needed.

Im using a Win 70 SS.

FOTIS · Jan 2, 2008

Cartridge : .338 Win Mag.
Bullet : .338, 250, Nosler PART SP 35644
Cartridge O.A.L. L6: 3.340 inch or 84.84 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : Alliant Reloder-19

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 83 56.80 2166 2604 31818 8145 90.4 1.633
-18.0 86 58.22 2219 2734 33945 8403 91.6 1.589
-16.0 88 59.64 2273 2867 36215 8654 92.7 1.546
-14.0 90 61.06 2326 3004 38639 8895 93.8 1.500
-12.0 92 62.48 2380 3144 41229 9128 94.8 1.455
-10.0 94 63.90 2434 3288 43997 9350 95.7 1.411
-08.0 96 65.32 2487 3435 46961 9560 96.5 1.370
-06.0 98 66.74 2541 3584 50134 9758 97.2 1.329
-04.0 100 68.16 2595 3737 53534 9942 97.9 1.290 ! Near Maximum !
-02.0 102 69.58 2648 3893 57184 10112 98.4 1.253 ! Near Maximum !
+00.0 104 71.00 2701 4051 61104 10268 98.9 1.217 ! Near Maximum !
+02.0 106 72.42 2755 4212 65311 10407 99.3 1.182 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 73.84 2808 4376 69808 10530 99.6 1.148 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 75.26 2861 4542 74639 10635 99.8 1.115 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 76.68 2913 4711 79842 10721 100.0 1.084 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 78.10 2966 4882 85453 10789 100.0 1.053 !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 71.00 2817 4406 73124 9964 100.0 1.132 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 71.00 2541 3584 49808 10054 93.6 1.328