A positive I see is in using monolithic bullets. If I want to maintain sectional density in going to a monolithic bullet, I will need a longer bullet like the Hornady 160 CX which may not stabilize in a SAAMI spec 7 Rem Mag barrel. It will in the 7 PRC. And that is a concern going forward. Not that I plan on hunting in California, but I believe they require a non-lead projectile for hunting. I can see Oregon and Washington following. Even here in Arizona, they are pushing the non-lead option for hunting big game.
Explain How 7 PRC Has Tighter Tolerances VS 7 MM Rem Mag, without bashing any company
- Thread starter Cholla
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Bob, the Devil is in the details of stretch like that! I have shot 7 STW's since Lane Simpson wrote the first article in Shooting Times Magazine(1989?) about the cartridge. My only regret is not having ordered 10,000 Winchester cases.
With customs, if you want to improve on the 7 mag in terms of practical performance, just go 28 nosler with AGD brass, 7 Practical, or 7 Mashburn super off of 300 Win brass. Factory rifles are another conversation. Sooner or later, many people may speak up to the fact that they do not want to shoot 175-180g bullets....hard to say...time will tell.
With customs, if you want to improve on the 7 mag in terms of practical performance, just go 28 nosler with AGD brass, 7 Practical, or 7 Mashburn super off of 300 Win brass. Factory rifles are another conversation. Sooner or later, many people may speak up to the fact that they do not want to shoot 175-180g bullets....hard to say...time will tell.
MagnumManiac
Well-Known Member
The shoulder moves forward to fill the chamber, the case does not stretch in ANY direction. This MYTH has been repeated so many times it is believed to be true…
Cheers.
Stretching 20 though in length? Sounds like over chambering.
2 though or 20 though? Your first post was .020. I set mine too move .0005-.001 after firing
take one piece of brass and keep reloading it, see when it starts to split.
twenty though
I'm talking total movement from virgin to fully formed to the chamber.
Then whoever is chambering it is doing it wrong. Theres no way saami brass is growing 20 thousands in a Saami chamber without it being over chambered. Something is off
No go guage is only .004 longer then go
There is nothing wrong with the chamber, the virgin brass is short.
"Peterson makes the traditional SAAMI spec'd version that headspaces off the belt. But it also makes a version that headspaces off the shoulder. Peterson calls that version the 7Rem Mag "Long". This listing is the LONG spec version."
Derek Peterson, president of Peterson Cartridge explains, "Traditional .300 Win Mag casings tend to show signs of case head separation after only 5 to 7 firings.
"Here's why. The SAAMI specs for any caliber, 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 .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. That might not sound like a lot, but it is.
"That large gap is what causes the casing to stretch so much when it is fired. It's that stretching that causes premature case head separation."
Peterson continued, "With Peterson .300 Win Mag- Long casings, we make them with a longer L-T-S dimension. All the other dimensions are SAAMI spec. But the longer L-T-S prevents the casing from stretching excessively on the 1st firing. The casing has more support, which translates to less stretching, which translates to longer case life."
Come on man....just replying to the OP and original post. In todays world things are what ever they who pitched the 7PRC the latest wants. They can lie and people drink it faster than water in the Sahara. Marketing 101..... if your going to sell the same thing it wont sell unless it has something to make it appear different. No where in that sentence is the word truth.
