.340 Weatherby on the way. need load suggestions

[Sako7STW]

Well after a heads up from dubyam, I should have a .340 Weatherby Mark V Alaskan on the way. I say should as I dont ever count my chickens before they hatch LOL. The gun has a 26" barrel + muzzle brake.

So now I gotta start thinking on loads. I am thinking about trying the 180gr. or 200gr. GS Custom bullets, 225gr. TSX, and pretty much same weights in the accubonds. I like em moving fast!!

 

[Guest]

I'm assuming the nice folks down at Mark's took good care of you? Glad to hear it worked out to your satisfaction. Enjoy the new Alaskan!

 

[FOTIS]

IMR 7828 aith 210 PTs at 3200 fps

 

[Sako7STW]

I'm assuming the nice folks down at Mark's took good care of you? Glad to hear it worked out to your satisfaction. Enjoy the new Alaskan!

They did! I called them and talked to them about a few different rifles they had. Out of all I was interested in, they threw me the best deal on that Alaskan you showed me. So good, i don't want to say how much but lets just say it was significant! I had them bore scope it and they said it was clean clean clean, so I hope they are honest about it. I kicked it around for a while as I have never bought a used rifle sight unseen . I decided it was a good enough deal that even if it isn't to my standards, I could resale it here where that size of rifle is far more popular and probably make money on it. I am waiting on a bonus check to come in but I finally decided I needed to jump on this before someone got it. So I took advantage of their charge card deal. All I am waiting on now is approval but I am not worried about that.

 

[lechero]

86.5 grains of IMR 7828 with the 225 or 250 AccuBond.

 

[JD338]

IMR 7828 aith 210 PTs at 3200 fps

+1
The 210 gr PT at 3200 fps is a flat shooting hammer.

JD338

 

[Sako7STW]

So 7828 seams to be the powder of choice. I was really expecting to see RL22,25,33 and Retumbo come up as well. So would 7828 still be a good choice for the lighter weights like the 180's (or the GSC 180 which acts more like a 165) or would I want to go to something faster?

I thought I knew powders till that 25-06 thread that still has me so messed up I cant get my head around it.

 

[SJB358]

Cartridge : .340 Weath. Mag.
Bullet : .338, 210, Nosler PART SP 16337
Useable Case Capaci: 92.060 grain H2O = 5.977 cm³
Cartridge O.A.L. L6: 3.675 inch = 93.35 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 7828 SSC

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 94 81.59 2826 3724 44029 10757 94.2 1.353
-09.0 95 82.49 2860 3815 45589 10888 94.7 1.331
-08.0 96 83.40 2895 3907 47231 11014 95.3 1.309
-07.0 97 84.30 2929 4000 48924 11136 95.8 1.288
-06.0 98 85.21 2963 4095 50691 11253 96.2 1.267
-05.0 99 86.12 2998 4190 52525 11364 96.7 1.246
-04.0 100 87.02 3032 4287 54434 11470 97.1 1.226
-03.0 101 87.93 3066 4385 56420 11571 97.5 1.206 ! Near Maximum !
-02.0 102 88.84 3101 4484 58488 11666 97.9 1.186 ! Near Maximum !
-01.0 103 89.74 3135 4584 60641 11755 98.2 1.167 ! Near Maximum !
+00.0 104 90.65 3170 4685 62886 11838 98.6 1.148 ! Near Maximum !
+01.0 105 91.56 3204 4787 65228 11914 98.8 1.130 !DANGEROUS LOAD-DO NOT USE!
+02.0 106 92.46 3238 4890 67668 11984 99.1 1.111 !DANGEROUS LOAD-DO NOT USE!
+03.0 107 93.37 3273 4994 70218 12048 99.3 1.093 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 94.28 3307 5099 72879 12104 99.5 1.076 !DANGEROUS LOAD-DO NOT USE!
+05.0 109 95.18 3341 5205 75656 12154 99.7 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 104 90.65 3327 5162 76749 11465 100.0 1.059 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 90.65 2952 4063 50894 11476 92.1 1.263


Cartridge : .340 Weath. Mag.
Bullet : .338, 225, Nosler AccuBond 54357
Useable Case Capaci: 86.739 grain H2O = 5.632 cm³
Cartridge O.A.L. L6: 3.675 inch = 93.35 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 7828 SSC

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 94 76.88 2713 3678 43602 10206 94.5 1.402
-09.0 95 77.73 2746 3767 45145 10327 95.1 1.379
-08.0 96 78.59 2779 3857 46750 10445 95.6 1.357
-07.0 97 79.44 2811 3948 48418 10558 96.0 1.335
-06.0 98 80.29 2844 4041 50152 10666 96.5 1.313
-05.0 99 81.15 2877 4134 51954 10769 96.9 1.292
-04.0 100 82.00 2909 4229 53830 10867 97.3 1.271
-03.0 101 82.86 2942 4324 55781 10961 97.7 1.251 ! Near Maximum !
-02.0 102 83.71 2975 4421 57812 11049 98.1 1.231 ! Near Maximum !
-01.0 103 84.57 3007 4518 59927 11131 98.4 1.211 ! Near Maximum !
+00.0 104 85.42 3040 4617 62132 11207 98.7 1.192 ! Near Maximum !
+01.0 105 86.27 3073 4717 64429 11278 98.9 1.173 !DANGEROUS LOAD-DO NOT USE!
+02.0 106 87.13 3105 4817 66827 11343 99.2 1.154 !DANGEROUS LOAD-DO NOT USE!
+03.0 107 87.98 3138 4919 69327 11401 99.4 1.135 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 88.84 3170 5021 71937 11454 99.6 1.117 !DANGEROUS LOAD-DO NOT USE!
+05.0 109 89.69 3203 5125 74662 11499 99.7 1.100 !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 85.42 3188 5079 75795 10824 100.0 1.100 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 85.42 2833 4010 50304 10902 92.4 1.310

Cartridge : .340 Weath. Mag.
Bullet : .338, 250, Nosler AccuBond 57287
Useable Case Capaci: 84.076 grain H2O = 5.459 cm³
Cartridge O.A.L. L6: 3.675 inch = 93.35 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 7828 SSC

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 73.80 2602 3759 44669 10019 96.2 1.453
-09.0 94 74.62 2632 3847 46237 10127 96.7 1.430
-08.0 95 75.44 2663 3936 47864 10231 97.1 1.407
-07.0 96 76.26 2693 4026 49554 10330 97.5 1.385
-06.0 97 77.08 2723 4117 51308 10424 97.8 1.363
-05.0 98 77.90 2754 4209 53133 10513 98.2 1.341
-04.0 99 78.72 2784 4302 55027 10597 98.5 1.320
-03.0 100 79.54 2814 4396 56998 10677 98.8 1.299 ! Near Maximum !
-02.0 101 80.36 2844 4491 59045 10750 99.0 1.279 ! Near Maximum !
-01.0 102 81.18 2874 4586 61183 10818 99.2 1.259 ! Near Maximum !
+00.0 103 82.00 2904 4683 63387 10881 99.4 1.239 ! Near Maximum !
+01.0 104 82.82 2934 4780 65716 10938 99.6 1.220 !DANGEROUS LOAD-DO NOT USE!
+02.0 105 83.64 2964 4878 68126 10989 99.7 1.201 !DANGEROUS LOAD-DO NOT USE!
+03.0 106 84.46 2994 4977 70638 11034 99.8 1.182 !DANGEROUS LOAD-DO NOT USE!
+04.0 107 85.28 3024 5077 73259 11072 99.9 1.163 !DANGEROUS LOAD-DO NOT USE!
+05.0 108 86.10 3054 5177 75991 11105 100.0 1.145 !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 103 82.00 3034 5109 77378 10416 100.0 1.146 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 103 82.00 2718 4102 51268 10758 94.2 1.360


I would think 7828 would be excellent for the big 340. It is impressive across the board. RL22 would be my choice, only because I use alot of it, but 7828 should be awesome.

Looks pretty good with the 180 GSC..

Cartridge : .340 Weath. Mag.
Bullet : .338, 180,HV 070 GS Custom
Useable Case Capaci: 91.654 grain H2O = 5.951 cm³
Cartridge O.A.L. L6: 3.675 inch = 93.35 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 7828 SSC

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 98 85.14 2987 3566 42702 10574 90.9 1.280
-09.0 99 86.09 3027 3662 44376 10722 91.7 1.258
-08.0 100 87.03 3067 3760 46124 10864 92.4 1.235
-07.0 101 87.98 3107 3858 47946 11001 93.1 1.214
-06.0 102 88.92 3147 3959 49849 11134 93.7 1.192
-05.0 104 89.87 3187 4061 51835 11260 94.3 1.171
-04.0 105 90.82 3228 4164 53910 11381 94.9 1.150
-03.0 106 91.76 3268 4269 56079 11496 95.5 1.130 ! Near Maximum !
-02.0 107 92.71 3308 4375 58347 11605 96.0 1.110 ! Near Maximum !
-01.0 108 93.65 3349 4483 60721 11707 96.6 1.090 ! Near Maximum !
+00.0 109 94.60 3389 4592 63206 11802 97.0 1.071 ! Near Maximum !
+01.0 110 95.55 3430 4702 65810 11891 97.5 1.052 !DANGEROUS LOAD-DO NOT USE!
+02.0 111 96.49 3470 4814 68534 11972 97.9 1.034 !DANGEROUS LOAD-DO NOT USE!
+03.0 112 97.44 3511 4927 71403 12046 98.2 1.015 !DANGEROUS LOAD-DO NOT USE!
+04.0 113 98.38 3551 5041 74407 12112 98.6 0.997 !DANGEROUS LOAD-DO NOT USE!
+05.0 114 99.33 3592 5157 77564 12170 98.9 0.980 !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 109 94.60 3582 5127 77445 11628 100.0 0.984 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 109 94.60 3132 3920 50859 11208 88.9 1.184

 

[HomerOz]

G'Day Fella's,

Sako7STW, the only load I have worked up in my .340 Wthby, is as follow;
200grn Hornady Spire Pt, 94grns of Reloader 22, Weatherby cases, CCI 250Mag primers,
5 shots chronographed (Oehler 35 P) as follows
Max Vel = 3218 fps
Min Vel = 3184 fps
ES = 34 fps
Std Dev = 14 fps
Average = 3204 fps

Hope that helps

Doh!
Homer

 

[Oldtrader3]

I always figured that if you are going to shoot 180-200 grain loads in a a .340, get a .300 Weatherby instead. The loads that I used in my .340 were listed as factory loads by Weatherby at one time. I mostly used the 210 and 225 grain and both will just at 3100 with the 225 gr Partition and over 3100 (slightly) with the 210 Partition. I used the 225 grain Partition because they were the most accurate in my 26 inch, Accubraked Alaskan and the outran the 210's at 500 yards.

 

[REDGREEN]

Mine liked IMR 7828 and 250 grain. It would shoot the 200's extremely well too, but its sweet spot was the 250 grain.

 

[Alaska]

Reloader 25 @ 90.0 or 87.0 of IMR 7828
250gr Nosler Part or AccuBond
WBY Cases
Fed 215M primer


IMR 4350 @ 84.0
with 210 Nosler Part
same primer and brass
Dupicates Factory load
Excellent load for lower 48

Trim all brass to 2.815"

 

[SJB358]

Jeff, what are you clocking for speeds on the load?

 

[Oldtrader3]

My .340 Weatherby, 225 Partition loads with 88.0 grains of IMR 7828 SSC powder and a FED 215 MM primer clocked at 3080 fps. My 250 Partition loads with 87.0 grains of 7828 clocked at 2890 fps but were starting to have bolt lift issues and ejector marks on the case head.

 

[SJB358]

My .340 Weatherby, 225 Partition loads with 88.0 grains of IMR 7828 SSC powder and a FED 215 MM primer clocked at 3080 fps. My 250 Partition loads with 87.0 grains of 7828 clocked at 2890 fps but were startingto have bolt lift issues and ejector marks on the case head.

Got ya, thank you for the heads up Charlie. Both numbers look very good, that is for sure.

 

[Oldtrader3]

That was in a 26 inch barrel Mark V with Accubrake, chrono'ed at 15 feet.

 

[Oldtrader3]

The old Weatherby sheet listing IMR 7828 loads for the Weatherby cartridges are supposed to be old factory loads. Maybe something has changed in the meantime but these loads should be approached very carefully!

 

[Sako7STW]

Wow, thanks for the great info guys. I hope the rifle will be here this week. It got delayed on shipping a few days because I was stuck at work and missed giving them the final go ahead. I cant wait for it to get here!! I really want to get after some of those GSC bullets and some of the NABLR's if they have them for .338's .

 

[OldMan]

When I had mine I used 8mm Mag brass that you can just run it thru the sizer and comes out with the Wby shoulder. Trim the length and load. Start lower and work up; 88 gr 7828ssc 225 grain Hornady @ 3120. Kicked like a mule but shot under an inch. My other load was 200 BT's with imr4350, they shot real well also!