6.5 something

[7mmShooter]

33 nosler would be close but a lot of necking to do. Maybe the 25 blackjack? It is the 7 blaser necked down. I have a reamer for a 6.5 on the 308 norma case changed to 30 degree but it is belted.

You're thinking of the 257 Blackbird that's a necked down Blaser. The Blackjack is a modified and necked down 7 SAUM

 

[Patton243]

As far as I'm concerned, I wouldn't go anything over a 6.5x284. Anything that burns more powder than that you'll be replacing the barrel pretty quick. But it's your money you do whatever.

 

[25WSM]

That prometheus looks sweet as heck. But I'm just not down for using 50% more powder to gain 2 to 300 fps. I'll stick with the 6.5saum. Getting over 3500 from a 123 hammer and I'm sure 3600+ when I nail down the right powder for it.
Anybody know the capacity of the prometheus?
Shep

 

[Clem Bronkoski]

You'll need a very slow burning powder you can't find right now, a bonded , high ballistic coefficient bullet that holds together at close range yet expands reliably at lower velocities, readily available brass and better put creedmoor in the name somewhere or it will never work! Lmao!

That is funny. Call it the 6.5 CM Super!

 

[tribb]

6.5 RPM is super close to your specs.

Absolutely is thinking along that line myself

 

[25WSM]

Hopefully some more brass companies will start making the rpm brass. I think it will make an impressive line of cartridges. I'm liking the idea of a 7rpm. But really it could make any standard bolt face long action a magnum equivalent.
Shep

 

[robpiat]

I would neck down a 300 PRC to a 6.5 if I was inclined. Easy brass availability, good geometry, and has probably already been done.

Also 6.5 or 7 SAUM are cool.

7-300 PRC Initial Results - Winner

I'll be doing most updates on my FB page so feel free to follow there but I've also copied all the initial data below. https://m.facebook.com/story.php?story_fbid=2293458990932473&id=2028645630747145 Some of you may know that I had a reamer made to neck down the new 300PRC to 7mm to see what...

www.snipershide.com

 

[Zorack]

26 Nosler is what your looking then. Beltless case, good brass is available nosler and norma. Peterson, Alpha munitions, Bertram and atlas do 28 nosler you could neck down to 26 nosler as well.

 

[warrbuk]

You will need a lot of barrel length to achieve a lot over the SAUM or SS class of cartridges out there. 26N, 6.5x300 PRC, etc size casing.
A 28" gain twist 7.75-6.75" Shooting 131's or heavier.

 

[Vossman5]

That should satisfy the need for speed! I loved my 257 wby and though a 6.5 bullet at those speeds would be sweet.

Weatherby has a 264 called the 6.5-300, but that's almost 100gr capacity

 

[Vossman5]

You could always neck down a 300 Norma mag...but a 7rum necked down May be more cost effective

That's an option, but a big jump in case capacity compared to what he wants, a 7mm mag would be right where he wants it. Brass, not sure if it's worth it

 

[25WSM]

He doesn't want a belt but the 6.5x257wby works real good and goes 100fps faster than my 6.5 saum. Gotta love that long neck too.
I have the reamer but never built one for myself.
Shep

 

[Muddyboots]

OK, so Thor is taken so now I am thinking 6.5 Sledge Hammer based off the .375 Ruger. Hey the name is most important just like the 6.5CM kills over the horizon.

 

[warrbuk]

He doesn't want a belt but the 6.5x257wby works real good and goes 100fps faster than my 6.5 saum. Gotta love that long neck too.
I have the reamer but never built one for myself.
Shep

I like that cartridge with the right throat.

I built a SAUM with ADL configuration and a Wyatt box. The feeding is finicky at best.
I gave it to a buddy to use on a hunt and he struggled with it.

those 257x6.5 wby rounds will slide right in