Which 30 cal?

Varmint Hunter

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Sell the gun and buy a 300 RUM. The ultimate long range 30. You can always load it down to the poopers you are considering.

Interestingly enough, I did the opposite. While my 300RUM was a particularly accurate rifle it was just too much of a good thing for my needs. The blast from the PK brake was intolerable. I rebarreled to 30 Nosler and couldn't be happier. I've fooled around with loads that mimic everything from 300WSM to 300 WBY. And the best part is No More Obnoxious Brake!
 

gerrybaker1960

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Brakes are horrible. Rebarreling is one solution, I like mine better.

IMG_3729.jpg
 

Mike from Texas

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The 300WM is tried and true. My only gripe about it is the short neck.

I love “improved” cartridges; could a fella build a 30 Sherman Mag and use 300 PRC brass in a pinch? I don’t mind fire forming. I have a hard time paying $2 per piece of brass even though I’m a stickler for properly head stamped brass.
 

Mike from Texas

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Out of the three cartridges you posted, I would go .300WM myself. Peterson's new .300WM Long brass is awesome. No .014-.020" headspace issues with virgin brass. It has been within .002" of a fired case the last three rifles I have used it for.
30 Nosler will be hotter for sure, but limited components availability.
.300PRC brass is non-existent right now. And the Hornady brass is not very good.

So what is the difference in the “long” brass? I wasn’t able to find a good description on Peterson’s website.
 

David Emerson

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Let,s think about this. The Rum is the bad boy on the block but at the top. Lot,s of powder and Max capacity for a 30. But back off just a touch and then the 300 PRC. Not as fast but close enough. Less blast and easier to live with. I used to be a max velocity and live with the consequences. Now Lapua is coming with brass. ADG has brass just as good. The PRC is easy and close enough to the top that is hard to argue with. Very accurate. The difference? About 2 clicks
 

Mram10us

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Very surprised the 30 nosler isn't brought up more. The 300 prc has been around forever and never talked bout till they renamed it to the 300prc. I would take a nosler over the wm or prc.
 

Thescandinavian

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30-06 is probably what I would do with your list of requirements. It's found in most any store that has ammo. It's cheap. Gives you a boost over 308. Won't be nearly as handicapped with a short barrel compared to a win.mag. A friend of mine used a 20 inch 7 mag for yrs and loved it. No can.
Shep

An 30-06AI and loaded to 308win pressure should be able to do close to wm speeds out of an short barell and still do well with easily available factory.

The 300WM is tried and true. My only gripe about it is the short neck.

If short neck is a pain I would think someone made a long neck version wildcat.
 

338 dude

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Having Oregon mountain rifle replace the barrel on my rem 700. Been looking at 300 prc but can’t find brass for it. Should I go with 30 nosler or should I go 300 win mag?
300 WinMag can do anything you want with any north American big game and is available everywhere don’t make it complicated if you don’t have to
 

lancetkenyon

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So what is the difference in the “long” brass? I wasn’t able to find a good description on Peterson’s website.
I can't remember the numbers off the top of my head, so I will throw some arbitrary ones out.
Let's say the .300WM produces fired brass with a base to shoulder datum with a .420 comparator of 2.275". New virgin brass measures around 2.255"-2.260", meaning .020"-.015" short on headspace. That is a lot of room to stretch.
The Peterson .300WM Long comes virgin length at 2.273". Just a .002" headspace, which is where I bump my fired shoulders back to when I FL size a fired round.
I never did understand why virgin brass for the belted mags come so short on headspace. Most 7RM virgin brass is the same way.
 

Mike from Texas

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I can't remember the numbers off the top of my head, so I will throw some arbitrary ones out.
Let's say the .300WM produces fired brass with a base to shoulder datum with a .420 comparator of 2.275". New virgin brass measures around 2.255"-2.260", meaning .020"-.015" short on headspace. That is a lot of room to stretch.
The Peterson .300WM Long comes virgin length at 2.273". Just a .002" headspace, which is where I bump my fired shoulders back to when I FL size a fired round.
I never did understand why virgin brass for the belted mags come so short on headspace. Most 7RM virgin brass is the same way.

Interesting. I don’t shoot a lot of 300WM so I’ve never paid attention to this. So where does this stretch occur? Does it usually blow the shoulder forward? If so that compounds the short neck issue even more. Do most SAAMI dies push the shoulder back to the shorter length? Is this a problem among most belted magnums? I am considering building a switchlug gun with a 264WM and 300WM barrels but may rethink that if this is an issue across the board.
 

25WSM

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There really isn't an issue with the belted mags if you know how to set up your sizing dies. And the streching isn't an issue either because the case is held in place by the belt so most all of the stretch is in the front of the case. Basically when you shoot a factory load it's just doing a very mild fire form. Set up your die to bump a few and it will be good to go. If it was a problem the 300winnie and 7rem mag wouldn't be so popular. Some people don't like the belt on them but I don't really care if it has a belt or not. It's not in the way and doesn't hurt feeding and doesn't appear to hurt accuracy at all. The belt is just a relic from the H and H rounds that needed it for reliable headspacing. With the 7 and 300 and pretty much all belted mags can be set up to headspace on the shoulder and the belt isn't doing anything, just along for the ride.
My all time favorite cartridge is the 257wby mag and the belt has never done anything to make me not like it.
Shep
 

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