SKU: 5551764002

PETERSON BRASS 300 WIN MAG - LONG (50 PK)

Sale price$102.12 Regular price$113.47
Save 10%

Pay in installments of $28.37 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 20 - Jul 25

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

PETERSON BRASS 300 WIN MAG - LONG (50 PK)Get more reloads on your . 300 Win Mag casings with Peterson's . 300 Win Mag Long. If you are a handloader that wants more reloads from your . 300 Win Mag casings, then you're going to love Peterson . 300 Win Mag Long casings. The regular . 300 Win Mag casing Peterson makes is the traditional SAAMI specd version that headspaces off the belt. This longer casing version different is different however, as it headspaces off the shoulder. Traditional . 300

Get more reloads on your .300 Win Mag casings with Peterson's .300 Win Mag – Long. 
If you are a handloader that wants more reloads from your .300 Win Mag casings, then you're going to love Peterson .300 Win Mag - Long casings. 

The regular .300 Win Mag casing Peterson makes is the traditional SAAMI spec’d version that headspaces off the belt. This longer casing version different is different however, as it headspaces off the shoulder.  

Traditional .300 Win Mag casings tend to show signs of case head separation after only 5 to 7 firings. This is because SAAMI specs for any calibre, list a minimum and a maximum tolerance for each dimension on the casing and the rifle’s chamber. With most calibers, the max dimension of the casing for length-to-shoulder (L-T-S) has the shoulder of the casing right up against the chamber wall. 

With a .300 Win Mag, unlike most other calibers, if your rifle’s chamber is cut to the SAAMI minimum for L-T-S, and your casing is at the max length-to-shoulder dimension, the casing shoulder is still .0095” away from the chamber wall. With the same minimum rifle chamber, a casing at nominal L-T-S is .012” away from the chamber wall. In a worst-case scenario, if the casing was produced at the SAAMI minimum L-T-S, and the chamber was cut at the maximum L-T-S dimension, the casing shoulder could be up to .026” away from the chamber wall. This is actually quite a a lot.
That large gap is what causes the casing to stretch so much when it is fired. And it’s that stretching that causes premature case head separation.

These .300 Win Mag- Long casings are made with a longer L-T-S dimension. (All the other dimensions are SAAMI spec.) Its longer L-T-S is what prevents the casing from stretching excessively on the 1st firing. The casing gets more support, which means less stretching and ultimately, a longer case life.

 

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.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 5551764002

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.0 ★★★★★
Based on 26 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
R
Verified Purchase
Rabbit Hill Manor
Alexandria, US
★★★★★ 3
Lasted only 2 years normal wear
Size: 23 in
Soft and loved by dog. However after 2 years of washing every other month, it exploded in washer clogging drains and making mess.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 22, 2025
R
Verified Purchase
Racer88dude
Whiting, US
★★★★★ 5
Affordable long lasting easy to clean
Size: 23 in
Lasts a long time and easy to wash
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
T
Verified Purchase
Tracy K
West Palm Beach, US
★★★★★ 5
Great, comfy bed - so good I bought 2!
Size: 23 in, Size: 23 in
My dog loves this bed, I have one at home for him and one in my office at work (in pic). He sleeps so soundly on it. He’s about 7 lbs and it’s a great size for him, he likes to stretch out when he sleeps. It’s a simple, comfy bed good for dogs about 5-12 lbs. You may want to go one size bigger if your dog is 13-22 lbs.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 25, 2025
C
Verified Purchase
ColleenRN
Louisville, US
★★★★★ 5
Great price! Great Paper towel!
Package Size Name: XXL, Size: 150 sheet (Pack of 2)
These Amazon brand paper towels are great! They are the multi tear size, which is perfect for different uses. The price is good and they clean windows and glass wonderfully. Softness is so so, but if you don’t have an issue with that, then these are a great buy! I definitely recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2026
H
Verified Purchase
HD813
Battle Creek, US
★★★★★ 5
Strong, absorbent and a good price!
Package Size Name: XXL, Size: 150 sheet (Pack of 12)
These are good paper towels. Not thin at all. Strong, absorbent and capable of cleaning as well as the 'name' brand paper towels but at a much better price. I'm happy with them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026

recommand products