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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Amy Morley
Lowell, US
★★★★★ 4
Very soft, not firm at all
This pillow is very floppy and not firm at all. It is quite large and I was surprised at the size. My dog has taken a liking to it and decided it's now her new dig bed, which is fine by me, because it's really too soft for my liking. If you like soft pillows then this is for you. If you require something with a bit more support then you won't enjoy this pillow.
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Reviewed in the United States on May 11, 2025
R
Ronnie
Battle Creek, US
★★★★★ 5
Soft and supportive
I recently purchased the this pillow and I am happy with the quality and comfort it provides. Pillow is soft, plush, and supportive without being too firm. The down alternative fill offers the balance of fluffiness and structure, making them ideal for all sleep positions. Whether I’m sleeping on my back, side, or stomach, these pillows adapt beautifully and keep me comfortable throughout the night. They’re also breathable and skin-friendly, which is a huge plus for anyone with sensitive skin. After using them, I wake up feeling well-rested and free of neck stiffness. I like it.
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Reviewed in the United States on May 22, 2025
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Honest Reviews
Whiting, US
★★★★★ 5
Pillow
These DIORIS pillows are a game-changer! I’ve tried many pillows over the years, but these are by far the best. The down alternative fill is incredibly soft yet supportive, providing just the right amount of fluffiness without feeling too firm or too soft. I sleep on my side, and these pillows cradle my head and neck perfectly, giving me the support I need for a restful night. They’re breathable and skin-friendly, which is great since I tend to get hot while I sleep. The queen size is just right for my bed, and the pillows maintain their shape night after night. They feel like luxury hotel pillows! Highly recommend for anyone looking for a comfortable, supportive, and durable pillow.
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Reviewed in the United States on May 20, 2025
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Jackiee
Birmingham, US
★★★★★ 5
this pillow does work
For months my neck had been brothering me every morning when I woke up. Figured it was stress and I always planned on getting a massage. But I never did it. I ended up seeing this pillow on Amazon and got it. It was almost an instant 180. My neck pain is gone! This pillow is stuffed very full but isn't super firm. It's a bit hard to describe. The seams are well sewn and the pillow has held up very well for a week now. No weird smells or any type of red flag that I found. It's easy to flip and reshape in an instant.
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Reviewed in the United States on May 15, 2025
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Pamdirac
Fort Morgan, US
★★★★★ 5
Comfortable to use with firm support
This set of queen-size pillows has a great balance between softness and support. The down alternative fill feels plush and comfortable. The pillows also provide enough firmness to support the neck and shoulders. A better sleep quality achieved with less tossing and turning. For sleeping on side, back, or stomach, the pillows keep their shape and offer consistent comfort. A good choice for the improvement of sleep quality with more comfort.
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Reviewed in the United States on June 11, 2025

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