SKU: 5551764002

PETERSON BRASS 300 WIN MAG - LONG (50 PK)

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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.

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SKU: 5551764002

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4.4 ★★★★★
Based on 26 reviews
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ncgirl
Lake Worth, US
★★★★★ 3
DISAPPOINTED
Size: 25 Inch, Size: 25 Inch
I've bought this 9 times since it's my Maltipoos' favorite toy! Unfortunately the one that just came in is not up to par as those previously bought. The leather was cut sloppily & the sewing sometimes ran off the leather completely or so close to edges could easily be chewed open. I can't send back because bought as a treat before leaving for trip & the fact he's already seen it ! I used sewing machine to sew areas that were close to edges - had to take out stitches to remove top squeaker to be able to sew around that area on both sides. Don't know how long this one will last even though I used quilting thread which is a bit stronger than regular thread. Hope this was just a bad one & if so, wish company's quality control would have caught this & rejected it.
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Reviewed in the United States on March 21, 2026
K
Verified Purchase
KJ
Chelsea, US
★★★★★ 4
Not for aggressive chewers
Size: 36 Inch
My GSD ate half of it within 20min before I caught her. I don’t think it was meant for aggressive chewers so I can’t fault the product for that. My dogs did have a few hours of fun with it playing tug and it held up well.
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Reviewed in the United States on October 9, 2025
E
Verified Purchase
EWE
Boise, US
★★★★★ 5
Doug (my daughter’s dog) absolutely LOVES THIS TOY!
Size: 15 Inch
My daughters dog, Doug , loves this toy….. I have bought 3 of these in the past 12 months! Though he will destroy it, he chews and plays with it until there is almost nothing left!!!
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Reviewed in the United States on May 19, 2026
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Verified Purchase
L. Crotty
Lake Worth, US
★★★★★ 5
Emotional Support Lizard
Size: 15 Inch
This was my Goldendoodle puppy's first toy, and a year later, it's still his favorite. It was light enough for him to play with it at 9 pounds, but big enough that he still loves it at 40 pounds. He carries it around, slaps his brother with it, throws it and chases it, sleeps with it, etc. He enjoys his stuffies also, but he returns to this one repeatedly through the day, so I know he loves it. It's a bit discolored, but still fully intact. If you have a dog with a soft mouth who isn't prone to chewing, this toy is perfect. I've purchased extras to keep in the emergency supplies in both the house and the car.
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Reviewed in the United States on March 3, 2026
M
Verified Purchase
Marta
Carnegie, US
★★★★★ 1
Not for puppies or dogs who enjoy chewing toys.
Size: 25 Inch
NOT FOR PUPPIES OR CHEWERS! If you have a dog that is teething or enjoys chewing on toys for soothing this is not the toy to buy. My 4 month old ate the sneak head off and the inside plastic ball squeaker was exposed and fell out and my puppy swallowed it. I tried to take it away from him but it was too late .. he already swallowed it. This caused serious vomiting days later in my pup. I’m not likely to leave negative reviews unless I truly have a horrific experience and this toy provided just that. 0 stars.
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Reviewed in the United States on March 22, 2025

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