Peterson Brass 300 Weatherby Magnum Unprimed Box of 50

Peterson Brass 300 Weatherby Magnum Unprimed Box of 50
Item #:PCC300WBY50
$2.26 per piece
Buy 3 or more, save 5%! Only $107.34 per box!
Shipping: One flat fee of $12.95 per online order.
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Availability:In Stock
Due to the packaging and shipping process, case necks are often slightly dinged or bent and need to be rounded up and sized to give proper neck tension. New and/or fired cases must be full-length resized or have the expander ball of the sizing die run through the case neck prior to loading.
Read 4 Reviews

Product Information

All 50 count listings of Peterson Cartridge casings come in one of their plastic ammo boxes.

Made in the U.S.A.

The origins of one of the most popular cartridges designed by Roy Weatherby date to the 1940’s, when he used the existing concept of a venturi shoulder for his famous double radius shoulder magnum cartridge known as the .300 Weatherby Magnum.  The .300 Weatherby Magnum has been a favorite of long-range big game hunters since its formal introduction in 1944, largely due to its velocity and muzzle energy advantages over its contemporaries. 

Derek Peterson, President of Peterson Cartridge explains, “After successfully developing tooling for the conventional belted magnums, we decided to apply those lessons learned to producing a .300 Weatherby Magnum casing with the same high standards and quality as the rest of our casings.” Peterson continues, “Shooters and hunters can expect to find these casings available soon, and we would love to hear your feedback on them, so work up some loads and let us know how we did.” 


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.

This is not loaded ammunition.

Read 4 Reviews - Average Rating: 5 stars

Peterson Brass in 300 Win Mag

By JOHN H. on Feb 28, 2024
Highest quality, never varies, always resilient. I seek Peterson's brass out before considering Lapua. (Plus they give you a nice plastic ammo box)

Accuracy starts with quality brass!

By Brett K. on Feb 10, 2024
Peterson brass is the most consistent brass I have ever used, and when reaching out past 1000 yards, consistency is the key!

Peterson Brass Outstanding!

By Victor J. on Feb 08, 2024
I cannot praise the quality enough! This brass arrived protected in a plastic ammo box in perfect condition! The delivery box the brass arrived in was sturdy and well-packed. On the other hand, I just received from M.....y a quantity of 100 pieces of Weatherby factory brass. In very cheaply made cardboard boxes that were severely damaged in shipment, due mostly to the cheaply made, plastic, delivery shipping envelope. And it common knowledge that Weatherby brass is not exactly cheap!

Peterson 300 Weatherby Mag Brass

By Barry T. R. on Feb 02, 2024
Great product and presentation fast shipping well worth the wait to come into stock...
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