340wby needs help

[hoyt3417]

Is anyone getting or exceeding factory velocity with a 250gr. Cause looking at load data nothing comes near the factory loads that I can find. The numbers in the books are just about a 338win and if that's the case I should have went with that over the 340wby. Any tips or load data would be appreciated.

[BB340]

I only use 225grn TSX's in mine now. However I did try the 250grn TSX pushed along by 84 grains of RE19 that gave me an average velocity of 2870 fps out of my 26" Lazermark rifle.
But I found the 225grn TSX"s on top of 86 grains of RE19 and going 3050 fps would penetrate just as far, shoot flatter and were more accurate in my rifle.

[hoyt3417]

Well thank you maybe I'll have to go with a lower grain but I do love a heavy bullet

[.257]

Just a check with 4 reloading manuals. The 340 is 187 fps faster, and with a 250 grain bullet that is a game changer

I can also add, l have owned 4 different 338 win mag, in Winchester, Sako, Ruger, and TC barrel. None would push a 225 grain much over 2700 fps much less a 250 grain
I did try a 270 grain ELD-X in 340, that was going 2700, but wouldn’t group well

[deputyrpa]

I've been getting factory velocity with loads using MRP and 7828ssc, with 250gr SGK. The SGK has been the most accurate projectile in my Accumark. I've settled on 85gr MRP @2950fps for he most accurate & consistent load. I've loaded up to 86.8gr MRP, but the ES grew and there was no consistent velocity gains or accuracy improvements. My back-up SGK load is 86.8gr 7828ssc @ 2990fps.