7-300 win mag AI

[Wild Monkey]

Cool Round! I'd like to know any tricks to forming this brass before firing, I have some ideas about using box ammo converted.

 

[dogz]

Very subtle difference.
It's about 3 grains more in the improved version.

Probably pretty darn close to the 7 Mashburn Super that's been around since the 60's or so. Love those Big 7's!

 

[Wild Monkey]

I find 300 Win Mag is the only Magnum ammo for sale.

 

[RockZ]

I sold it to a buddy a while ago and he loves it

 

[archeratlrg]

Very subtle difference.
It's about 3 grains more in the improved version.

What's you shoulder blown out?

 

[archeratlrg]

Very subtle difference.
It's about 3 grains more in the improved version.

I know this is an older thread, but what is it blown out to on the shoulder?

 

[Victor3Ranger1]

think you may have that figured out, where you shooting over the chrony when you shot the seating groups? you plan on shooting any of the bigger stuff out of that? i would be interested to see what it would do with a 180 berger. I am running the straight 7-300 win with a 180 at 3140

That's what I want is a straight 7-300 win, I don't know why but I do.

 

[calib]

It shot great.

 

[Wild Monkey]

I know this is an older thread, but what is it blown out to on the shoulder?

Here's the picture he posted with the 40 degree shoulder after fire forming

archeratlrg​

 

[archeratlrg]

View attachment 601181
Here's the picture he posted with the 40 degree shoulder after fire forming

archeratlrg​

Thanks, I knew it was 40 degrees but was it blown out to a wider diameter on the shoulder, say to .492 or .495? Any idea?