257 Weatherby - IMR 4831

[300winnie]

This is posted in other forums, so if you saw it there I am sorry for the duplication.

I have a brand new .257 Weatherby to play with (Remington 700 CDL) and I have all of the "go to" powders for the cartridge as I had a Mark V POS that kept sucking me in. Powders on hand are H-1000, RL-25, RL-22, RL-19, IMR-7828, IMR-4350 and IMR 4831.

Everything I read leans towards something other than IMR-4831, but in looking at my Nosler manuals (I have volumes 3, 4, 6 and 7) IMR 4831 is always listed for the 100 grain bullets, and always has the top listed velocity. Yet, it is a rare case indeed to hear of someone using this powder in this cartridge.

Is there anyone out there that has tried, or is currently using this powder in this cartridge? If so, do you mind sharing your experiences. I have roughly 10 pounds of it with no other use currently.

I will be attempting to work up some fast and accurate loads utilizing the 100 grain Swift Scirocco.

Thanks.

 

[FOTIS]

70 gr rl22 with 100 gr BT---3500 fps great accuracy

 

[truck driver]

Ya send it to me so I can load it in my 300Wby :roll: :lol: Unfortunatly I can't help you with loads for the 257 Bee. The Guys on the Weatherby Nation love that round and could help you out with that. :wink:

 

[Guest]

Agree w Fotis.
I shoot 70 gr RL22 in mine with the 100 Etip. Fast and accurate .
CCI mag primers.
Sorry, haven't tried 4831, the RL22 works too well to mess with.
Dewey

 

[SJB358]

It looks pretty good from my angle..

Cartridge : .257 Weath. Mag
Bullet : .257, 100, Nosler BalTip 25100
Useable Case Capaci: 77.655 grain H2O = 5.042 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 4831

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 85 58.05 3220 2302 47568 11738 100.0 1.305
-09.0 86 58.70 3251 2346 49029 11806 100.0 1.287
-08.0 87 59.34 3281 2390 50530 11869 100.0 1.268
-07.0 88 59.99 3311 2435 52072 11932 100.0 1.251
-06.0 88 60.63 3341 2479 53656 11995 100.0 1.233
-05.0 89 61.28 3371 2523 55283 12056 100.0 1.216 ! Near Maximum !
-04.0 90 61.92 3401 2568 56955 12117 100.0 1.199 ! Near Maximum !
-03.0 91 62.57 3430 2612 58674 12177 100.0 1.183 ! Near Maximum !
-02.0 92 63.21 3459 2657 60439 12237 100.0 1.167 ! Near Maximum !
-01.0 93 63.86 3488 2701 62253 12295 100.0 1.151 ! Near Maximum !
+00.0 94 64.50 3517 2746 64118 12353 100.0 1.136 ! Near Maximum !
+01.0 95 65.15 3545 2791 66034 12410 100.0 1.121 !DANGEROUS LOAD-DO NOT USE!
+02.0 96 65.79 3574 2836 68004 12467 100.0 1.106 !DANGEROUS LOAD-DO NOT USE!
+03.0 97 66.44 3602 2881 70029 12523 100.0 1.091 !DANGEROUS LOAD-DO NOT USE!
+04.0 98 67.08 3630 2926 72111 12577 100.0 1.077 !DANGEROUS LOAD-DO NOT USE!
+05.0 99 67.73 3658 2972 74251 12632 100.0 1.063 !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 94 64.50 3622 2912 74939 12007 100.0 1.059 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 94 64.50 3358 2505 53079 12795 99.7 1.240

 

[FOTIS]

I like the loading density of RL22