tylerjwitty
CGN frequent flyer
- Location
- Northern Ontario
i wonder have sworn up and down that 300 win mag brass was the same as 338 winmag and 7 rem mag.
was i the only one out of the loop?
was i the only one out of the loop?
was i the only one who didn't know??
- Thread starter tylerjwitty
- Start date
Slooshark1
CGN frequent flyer
338 and 7mm are the same but 300 Win is longer.
Actually the 308 Norma is not a necked down 338. The case is longer, and it is longer in the body, the shoulder being noticeably farther, 0.070", up the case than the 338/7mm. It is also larger in diameter at the shoulder.
This gives it slightly more case capacity than the Winchester rounds, but for all practical purposes they are identical.
Ted
This gives it slightly more case capacity than the Winchester rounds, but for all practical purposes they are identical.
Ted
bearkilr
CGN Ultra frequent flyer
- Location
- Nowhere, ......just past the middle
Based off the 300 H&H. All of the calibers in the above posts are based off the 375 H&H, the King of all Calibers.
The 300 Win Mag was created to fit in a standard length magnum action and equal the ballistics of the 300 WBY. Cases based on the full length H and H brass don't work as well on standard length actions. The 300 Win Mag did it by using a very short neck and a long body blown out pretty good. It has been very accurate as well.
The shorter standard magnum cases 264/7mm/338 were not based on the H and H case other than sharing a belt.
The shorter standard magnum cases 264/7mm/338 were not based on the H and H case other than sharing a belt.
I am sorry, I miss typed the 308 Norma Mag was developed from the 338 win mag and was preceded by the wildcat 30-338 mag. The 308 norma was developed before the 300 win mag.(Ref The 308 Norma Mag aka the 30-338 by Chuck Hawks and the Norma web site)
bearkilr
CGN Ultra frequent flyer
- Location
- Nowhere, ......just past the middle
So what are you saying they are based off then? My understanding is that the H&H is the parent case. Obviously OAL, shoulder angles,etc. are different, but they are still based off the H&H.
If you're suggesting the 458 WinMag is the parent case you'd be correct, except that the 458's parent case is the 375 H&H.
Actually they are all based on the 375 H+H case. Shortened, blown out, etc, but still the 375 H+H, which was itself based on an earlier case (well, sort of). - dan
I thought 'other than sharing a belt' kind of covered it... there are not many belted magnums using the full length H & H brass. The belt is the only thing they share. None of the companies making all the shorter magnum calibers make it from full length H & H brass... you can credit H & H with inventing the belted magnum case though...
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What everyone is trying to say is that all the short belted magnums are based on wildcats that were originally made from modified 375 H+H brass. The factories draw their own brass, or have it done for them, from scratch. - dan
- Location
- Eastern Edge of the Foothills
I shoot 2 different 308 Norma rifles. Factory stamped brass is way too expensive for me, but I used to have a 7mm Rem Mag, and I still have a lot of brass from it.
When I load for my 308 norma's I just use the 7mm Rem Mag brass. I know it has a shorter neck than actual factory stamped brass, but that hasn't bothered me, nor affected performance.
I load those rounds fairly hot, and get a healthy amount higher than 3000 fps with Hornady 180 gr bullets. I shoot MOA with one rifle and 1.5 MOA with the other. Brass lasts 6-7 reloads. No pressure problems at all with either rifle.
The 7 rem mag brass has worked just fine for me for 3 years now. I just push em through the sizer die, then load the bullets with the seater die. Nothing fancy. Then they're ready to shoot. If I were to use 300 Win Mag brass, then after the sizer die I'd have a lot of trimming to do. So since I still have a couple hundred 7 mag brass, and because I don't like making unnecessary work for myself, I'll just stick to what I've been doing.
As far as I'm concerned, the 308 Norma is just a necked up 7 Rem Mag.
It's been working for me.
When I load for my 308 norma's I just use the 7mm Rem Mag brass. I know it has a shorter neck than actual factory stamped brass, but that hasn't bothered me, nor affected performance.
I load those rounds fairly hot, and get a healthy amount higher than 3000 fps with Hornady 180 gr bullets. I shoot MOA with one rifle and 1.5 MOA with the other. Brass lasts 6-7 reloads. No pressure problems at all with either rifle.
The 7 rem mag brass has worked just fine for me for 3 years now. I just push em through the sizer die, then load the bullets with the seater die. Nothing fancy. Then they're ready to shoot. If I were to use 300 Win Mag brass, then after the sizer die I'd have a lot of trimming to do. So since I still have a couple hundred 7 mag brass, and because I don't like making unnecessary work for myself, I'll just stick to what I've been doing.
As far as I'm concerned, the 308 Norma is just a necked up 7 Rem Mag.
It's been working for me.
Yep. I have also loaded a lot of 308 Norma using 7mm Rem Mag brass. First firing headspaces on the belt, and the shoulder blows ahead to form to the chamber. From there on, I size to headspace on the shoulder.
When using 338 Win Mag brass, I neck down until the bolt just barely closes on the resized case. This gives perfect headspace on the very first firing.
BTW, cases formed from 338 WM are almost exactly the correct length, not short like those formed from 7mm RM.
Ted
When using 338 Win Mag brass, I neck down until the bolt just barely closes on the resized case. This gives perfect headspace on the very first firing.
BTW, cases formed from 338 WM are almost exactly the correct length, not short like those formed from 7mm RM.
Ted
I hope no one listen to your advise and reloaded that way!
Um, what? What reloading advice? - dan
