Originally Posted by BobinNH
Here 's a picture sent by Rick Camuglia. Rick runs a Mashburn with 195's to 1500+ yards.

On the left is a 7 Rem mag, in the middle a 7mm Mashburn Super, and on the right a 300 Win Mag. We can easily see the 7 Mashburn and 300 Win Mag are longer. Th mash burn has the longer neck.Hader to see but it also has less taper. It does not look that much bigger but a charge of 75 gr of H1000 does not even come to the base of the neck! Water capacity is 90 gr.


How'd that happen? Smarter guys than us worked htis out in the 1950's,and optimized the cartridge to give OVER 3000 fps....with a 22" barrel....with a 175 gr bullet. The most modern 7mm magnums don't really beat those performance levels by all that much.

To wildcat the 7RM where you gonna go? Blow it out? it'a already pretty straight. Blow the shoulder forward? That makes the neck shorter than it is which is already a drawback.Compromises bullet seating.

Simply put the 7RM does not have enough case to work with if you want the next step up in velocity.




[Linked Image]



Dang I wish there was a website that had accurate case capacity data.

Does anybody know of one?

That 300WM necked to 7mm would appear to have greater capacity, although case taper is hard to gauge.

But according to this, it doesn't?

7x300 Case Drawing

Maybe it's differences in measuring methods?



FÜCK Jeff_O!

MAGA