30-378 Weatherby 200 grain accubond with Retumbo

[frankm]

Guys, could someone run a QL for me based on Weatherby factory cases, don't know capacity, Fed 215M, 200 grain AccuBond at 3.70 OAL and Retumbo.

Would also be interested in others input on these combos. Been shooting 111 grs of Retumbo with 180 AccuBond and getting 3350 ish with great accuracy. Got ahold of 4 boxes of 200 Accubonds and figured with this case capacity why not.... Looking at load data,not that much out there, it's all across the board. Hodgdon says 105 grains, have seen some people say 106 grains, etc. etc.

I know with the 180 Hodgdon reflects 113 as max and compressed... too hot in the rifle I'm shooting. Not sure where to start and work towards with the 200 grain bullet.

Thx for any help you guys can offer!

 

[Dwh7271]

Here you go.
I set the max at 63000. Book said 63800.

Cartridge : .30-378 Weath. Mag.
Bullet : .308, 200, Nosler AccuBond 54618
Useable Case Capaci: 119.202 grain H2O = 7.740 cm³
Cartridge O.A.L. L6: 3.655 inch = 92.84 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon Retumbo

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 80 88.39 2482 2735 35099 15860 98.3 1.589
-18.0 82 90.60 2546 2880 37656 16247 99.1 1.544
-16.0 84 92.81 2611 3027 40404 16588 99.6 1.491
-14.0 86 95.02 2675 3177 43358 16878 99.9 1.441
-12.0 88 97.23 2738 3329 46535 17115 100.0 1.394
-10.0 90 99.44 2800 3482 49911 17326 100.0 1.348
-08.0 92 101.65 2862 3637 53496 17532 100.0 1.304
-06.0 94 103.86 2923 3794 57318 17734 100.0 1.262 ! Near Maximum !
-04.0 96 106.07 2983 3951 61392 17931 100.0 1.222 ! Near Maximum !
-02.0 98 108.28 3043 4111 65738 18123 100.0 1.183 !DANGEROUS LOAD-DO NOT USE!
+00.0 100 110.49 3102 4272 70375 18309 100.0 1.146 !DANGEROUS LOAD-DO NOT USE!
+02.0 102 112.70 3160 4435 75327 18491 100.0 1.110 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 114.91 3219 4601 80618 18666 100.0 1.076 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 117.12 3277 4768 86278 18835 100.0 1.043 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 119.33 3334 4937 92337 18999 100.0 1.012 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 121.54 3392 5109 98832 19155 100.0 0.981 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 100 110.49 3163 4442 77870 18025 100.0 1.097 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 100 110.49 3027 4068 62830 18651 100.0 1.204 ! Near Maximum !

 

[Dwh7271]

Crud, wrong barrel length I would bet. Here's a 26.

Cartridge : .30-378 Weath. Mag.
Bullet : .308, 200, Nosler AccuBond 54618
Useable Case Capaci: 119.202 grain H2O = 7.740 cm³
Cartridge O.A.L. L6: 3.655 inch = 92.84 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Hodgdon Retumbo

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 80 88.39 2637 3087 35099 13288 99.6 1.719
-18.0 82 90.60 2701 3240 37656 13521 99.9 1.671
-16.0 84 92.81 2765 3395 40404 13712 100.0 1.615
-14.0 86 95.02 2828 3551 43358 13884 100.0 1.562
-12.0 88 97.23 2889 3708 46535 14053 100.0 1.512
-10.0 90 99.44 2950 3866 49911 14218 100.0 1.464
-08.0 92 101.65 3011 4025 53496 14379 100.0 1.418
-06.0 94 103.86 3070 4186 57318 14536 100.0 1.373 ! Near Maximum !
-04.0 96 106.07 3129 4348 61392 14689 100.0 1.331 ! Near Maximum !
-02.0 98 108.28 3187 4512 65738 14837 100.0 1.290 !DANGEROUS LOAD-DO NOT USE!
+00.0 100 110.49 3245 4677 70375 14981 100.0 1.251 !DANGEROUS LOAD-DO NOT USE!
+02.0 102 112.70 3303 4844 75327 15120 100.0 1.214 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 114.91 3360 5013 80618 15254 100.0 1.178 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 117.12 3416 5184 86278 15383 100.0 1.143 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 119.33 3473 5357 92337 15507 100.0 1.109 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 121.54 3529 5532 98832 15625 100.0 1.077 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 100 110.49 3301 4840 77870 14749 100.0 1.200 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 100 110.49 3176 4480 62830 15261 100.0 1.311 ! Near Maximum !

 

[HOGWILD338-378]

http://www.nosler.com/30-378-weatherby-magnum
the data above is for Nosler brass with a 26 inch tube and published data that is where i would start but a reloading friend always goes by max load but he starts 3 gr from max and works his way up but that is the way he loads? he goes up in 1/2 gr increments looking for pressure signs but being you are shooting that caliber i would use published data as max load is not always the most accurate? i prefer HOGDON as its not as temp sensitive being i live in the high desert!

 

[FOTIS]

Mine tapped out at 106 gr with an actual velocity of 3275

 

[JD338]

3100 fps+ is going to make for a long range hammer!

JD338

 

[HOGWILD338-378]

Makes me wanta get one! :mrgreen: but my 338-378 will run 225's at 3180 and is a tack driver ! Not sure what I have more of 12 Ga shotguns or 30 Cal's :grin:

 

[frankm]

Dwh7271, thanks for the QL. First one threw me and then I read your change to 26" barrel. Seems right in line with what data I've been able to glean.

Fotis, 3275 is cooking....! I'd like to get in 3100 fps range and not totally hammer the brass. It's a little spendy when you loosen primer pockets in a couple loadings! Plan to start at 101 grains and go up in 1 grain increments. Thanks to all of you gents for your experienced replies!

 

[Dwh7271]

Welcome Frank.

 

[FOTIS]

I have Q/L and it does not work very well with my Bees....and I own pretty muck all of them

 

[SJB358]

The freebore on the RUMs and Weatherbys isn't factored in well enough for QL. I've tried it a lot. Plain old Weatherby or Nosler Data is usually very decent.