300 wm custom freebore velocities

[Antarcticchamp]

For those who have 300 mag Chambers with increased freebore what kind of velocities are you seeing?
I think I've decided on a custom 300 wm barrel over a nosler or RUM and I'm curious how much I'll be leaving on the table.

 

[Longtine88]

You can get 3,050 out a 215 hybrid with N570. Ladd over on LRO gets 3,080 I believe. 26" barrel

 

[MagnumManiac]

With an A191 chamber, which is set up for a 215 Berger Hybrid, you can achieve over 3050fps in a 26" barrel, my 28", 30" and 32" run 3120fps, 3190fps and 3240fps respectively.
I can get 2980fps out of my 26" barreled Rem Sendero with RE25. But less than this with every other powder. This rifle is running a SAAMI chamber, with standard throat, it could be faster if I lengthened throat.

Cheers.

 

[Dmagna]

I have a savage setup and I hit 3000fps with H1000 and a Berger 215. Norma brass

 

[Mooseknuckles]

I have a remage setup and I hit 3000fps with H1000 and a Berger 215. Norma brass

I am running the same setup in my 300 win. Getting 2960 out of a 26 inch barrel with bullet seated at 3.703

 

[Dmagna]

I am running the same setup in my 300 win. Getting 2960 out of a 26 inch barrel with bullet seated at 3.703

I think mine is even longer than that, I installed a 2.85 bottom metal. Oops not a remage, just a savage

 

[huntinfool18]

Does anyone know if the A191 chamber will work with Peterson long brass??
from what I gather the A191 chamber was designed to minimize case growth

 

[belizejet]

I'm new to this. I'm rebuilding my 300WM (shot out factory barrel) to a remage with longer bottom metal and mags. I ordered an X-caliber carbon barrel with 1-9 twist in December. I'm wondering how much Freebore I need to put in the chamber. I'm thinking .01 or .015? What are you all experiencing?

 

[amu_shooter]

I'm running an easy 2925fps with 250 A-Tips using RL25 and 30 inch barrel.

Zero sign of pressure, it groups so well, I never explored upper limit.

 

[Dmagna]

I'm running an easy 2925fps with 250 A-Tips using RL25 and 30 inch barrel.

Zero sign of pressure, it groups so well, I never explored upper limit.

Fastest win mag on the planet right there

 

[amu_shooter]

I don't think it's that special, back in the day when we only had 240SMKs, we were running those at 2850 using H1000 from a 28 inch tube.

And we were shooting those out of slings for NRA style 3x1000 matches, talk about a beating.

 

[K.E.C. Darkside]

Does anyone know if the A191 chamber will work with Peterson long brass??
from what I gather the A191 chamber was designed to minimize case growth

Howdy, did you ever get a answer on this reamer, long or standard length brass.
Thanks.