300 NMI Chamber Version Advice.

[HuntnPack]

Looking for 300 Norma Mag Improved advice for my nephew on which chamber version to consider.
Use will be Long range, 28" barrel suppressed.
Hunting / Steel / Cross Canyon, etc.
245 gr. Berger's
Need access to reamer, Dies etc.

Any advice is appreciated
Thx,
HP.

 

[Quicksilver338]

If you're looking to purchase a reamer and have a little more info out there then Alex wheeler has specs on his.

If you're looking to have a rifle built I'd look at Ryan Pierce.

You can't go wrong with either.

 

[HuntnPack]

Nephew will be having local smith do the build.
Or possibly send off his action for chambering.

 

[Quicksilver338]

If definitely go the Alex wheeler route, I believe most of his dies are the AW2 ones. Some manufacturers carry matching dies as well under the same name.

Bullet central has 35° sizing dies and I believe Alex's are 35°.

 

[cjl2010]

I bet @Elk Hunter 338 probably has one dialed in.

 

[MallardAddict]

I've been very happy with my 300nmi rifle built by Hells Canyon on his reamer and dies.

 

[HuntnPack]

I've been very happy with my 300nmi rifle built by Hells Canyon on his reamer and dies.

Ya, I talked to Mike a while back & he wasn't doing his anymore.

 

[nwmnbowhunter]

You are being redirected...

Wheeler reamer with 27 pages of info

 

[jfswanson12]

when I built mine last year I had Alex wheeler do it. He has it pretty dialed. I had it throated for a compromise between the 230-245 bergers

 

[Mike D Texas]

Alex Wheelers reamer is available from JGS reamers and bullet central sells the micron dies.

 

[7.62 Gunner]

Looking for 300 Norma Mag Improved advice for my nephew on which chamber version to consider.
Use will be Long range, 28" barrel suppressed.
Hunting / Steel / Cross Canyon, etc.
245 gr. Berger's
Need access to reamer, Dies etc.

Any advice is appreciated
Thx,
HP.

I built mine last year and had Manson spec me a 40 degree Ackley version based on Lapua brass.
I really didn't want to go through the hassle of fire forming for a 33 or 35 degree shoulder.
Hornady made my dies measured from fired brass.
I couldn't be happier with how it all turned out, pm me if you want my reamer drawings

 

[HuntnPack]

I built mine last year and had Manson spec me a 40 degree Ackley version based on Lapua brass.
I really didn't want to go through the hassle of fire forming for a 33 or 35 degree shoulder.
Hornady made my dies measured from fired brass.
I couldn't be happier with how it all turned out, pm me if you want my reamer drawings

Do you have the reamer? Rent it out?

 

[Mike D Texas]

I built mine last year and had Manson spec me a 40 degree Ackley version based on Lapua brass.
I really didn't want to go through the hassle of fire forming for a 33 or 35 degree shoulder.
Hornady made my dies measured from fired brass.
I couldn't be happier with how it all turned out, pm me if you want my reamer drawings

What's the difference between fireforming a 33/35° shoulder and a 40° shoulder? You are fireforming either way.

 

[7.62 Gunner]

What's the difference between fireforming a 33/35° shoulder and a 40° shoulder? You are fireforming either way.

Might as well go 40 degrees and reduce brass growth to the maximum extent possible, lower bolt thrust and slightly more capacity are also benefits.