Skip to the content

.340 Weatherby Magnum

When Winchester released their .338 Win Mag, Roy Weatherby felt his company needed to respond. And respond they did, in a big way, with the .340 Weatherby. Introduced in 1963 and based on the .300 H&H Magnum, the .340 Weatherby Mag outperforms the .300 Ultra Mag, .338 Win Mag, and rivals the .375 H&H. Its flatter shooting, harder hitting characteristics make it ideal for even the largest of North American big game and more than suitable for any excursion to the African Serengeti.

“While we were discussing potential calibers for development, it was suggested that we look at the .340 Weatherby Mag,” says Derek Peterson, president of Peterson Cartridge. “When we did, we saw that only a couple manufacturers were making it. We felt its place in history was too important to ignore, so we decided to add it to our line-up. Load some up and let us know how we did”.

Additional Information

Warning: Only use Peterson Cartridge Co. casings in firearms in good condition, designed, marked, and chambered for this cartridge. Do not use Peterson Cartridge Co casings for “fire forming” or any other purpose other than what they were designed and tested for. Peterson retains no responsibility for the enclosed casings if they are used outside of the manufacturer’s recommendations.

Back To All Calibers

Extremely consistent, American-made brass rifle casings and ammunition, designed for long-distance shooters.