7mm-300 win mag

[Deleted member 25294]

I have a 300 win mag that I'm about to re-barrel, I've been thinking about the 7mm-300 wm. does anyone have experience loading this round? How difficult is case re-forming, and is it necessary to fire form the brass. If the process of case prep is too expensive/complicated, I might consider the 7mmSTW

 

[LouBoyd]

What action are you using? One important part of deciding is magazine length.
A 7mm RM has a 2.5" case 3.29" OAL
the 300 WM has a 2.62" case 3.34" OAL
the 7mm STW has a 2.85" case 3.65" OAL
those lengths re SAAMI

Any of those cartridges are only "long range" with heavy VLD bullets. When loaded properly they >will< l be longer than the SAAMI OAL. Consider the length of the magazine your rifle has. In my opinion a 3.34" magazine (as on most Win 70 standard magnums) is too short for even a 7mm Rem Mag with VLD bullets. but ok in a Rem 700 with it's standard 3.6" magazine. A Rem 700 is too short with heavy VLD bullets in a 7mm STW unless the magazine is extended, and too short for a 300 Win Mag with VLD bullets. Extended magazine are available but require a some machining of the action. I'm not saying you should or shouldn't go with the 7mm-300, but magazine length and bullet seating depth are something you should consider before making your decision. I have a 7mm STW on a 700 action with an extended magazine which I really like. A 7mm RM works well with VLDs in a standard 3.6" magazine actions too.

What I'd like to see is 7mm cartridge based on the 7mm Rem Ultra or 300 Rem Ultra but >shortened< to the same length as the 7mm RM case for use in the Rem 700 with VLDs. I don't want it enough to go to the hassle of making reamers and dies for one rifle.

 

[JARHEAD1371]

Try this thread out ANYONE OWN A 7mm-300 WIN MAG?

 

[Deleted member 25294]

Thanks for the OAL info, I seated a round to 3.65" and it fit/cycled perfectly from my magazine (Rem 700 DM). The 7mmSTW should work fine if I went that route, any drawbacks with the STW? If I can get about 3200 FPS with 162 amax bullets I'd be happy, assuming that case life would still be good.

 

[Broz]

If I can get about 3200 FPS with 162 amax bullets I'd be happy, assuming that case life would still be good.

You can get really close to that with a 7-300 win with 180's in a 28" tube. In my opinion the difference between the STW and 7/300 is Brass and throat life.
Get some RWS brass for you 7-300 and you will be a happy hand loader. Necking down is not a big deal.

Jeff

 

[Deleted member 25294]

Can I use a basic 7mm neck sizer to re-form my 300 win mag cases, and a 300 body sizing die? Or would I need a custom set to neck down to 7mm? Also would I need to change the shoulder angle or could I get away with just necking down. How much harder would this round be on a barrel compared to a 7mm rem mag?
I appreciate any details you might have

 

[Broz]

I don't change the shoulder angle. It is same as the 300 win case. Simply necked down. I use a 300 win bushing die and a few bushings to step it down. Once it is stepped down and fired in the 7-300 chamber I simply use the 300 bushing die with a 7mm bushing.

If this cartridge really interests you there is a ton of info in this thread. As mentioned above

http://www.longrangehunting.com/forums/f19/anyone-own-7mm-300-win-mag-51404/

Jeff

 

[roadhunter]

Here is a great article that I think came from the above mentioned thread The 7mm Practical. A Practical Magnum.

My dad shoots a Shilen custom in 7mm-300 Win. It's a hammer! Good Luck.

 

[RockZ]

Lou,
Sin man is doing that with the 338 initially and has plans for a 7mm version.
Look for theads on the 338 sin.

 

[Deleted member 25294]

Thanks I've read every bit of that thread, all things said, and given how much I shoot, I think I better just go with the plain old 7mm. I only have about 150 of the 300 wm cases and most of those are on their 6th firing, seems like a good time to move on if ever.