300wm reamer

[LR Guru]

So I live in WA state and have a half built 300wm (scope, stock, trigger) I'm gonna have bartlein put a new barrel on it. True the action and bed it. I just emailed them asked them if they can ream it for rhian manthas 215 hybrid. If they can't does anyone know of a gunsmith i can send everything to have assembled with that reamer.

 

[shortgrass]

Provide 'um a couple of dummy rounds.

 

[LR Guru]

Provide 'um a couple of dummy rounds.

Yeah they just got back to me. Saying I have to purchase the reamer and the headspace gauge and they will do it but that voids the barrels warranty so I think I'll the have them ream it and I'll get them to tune eventually

 

[shortgrass]

That's normal. If you want 'special' you'll need to provide the tooling.

 

[MagnumManiac]

Get an A191 reamer, it doesn't allow the case to stretch as much as a SAAMI reamer.
Otherwise, get a Match reamer.

Cheers.

 

[LR Guru]

Get an A191 reamer, it doesn't allow the case to stretch as much as a SAAMI reamer.
Otherwise, get a Match reamer.

Cheers.

Okay. Thanks for the information. I'm new to all of the rifle building so I don't know much other than what I research. This is my first build. Am I better off going with a quality Smith then having bartlein do the work? And when I send them a dummy round what doesn't that mean. Obviously no powder or primer. A bullet loaded to my current max COAL or?

 

[MagnumManiac]

Bartlein will probably do an excellent job, but I have zero experience with them other than using their EXCELLENT barrels. It's really up to you if you use Bartlein or a smith
They require a dummy round (no primer or powder) so they can throat your barrel correctly. For instance, I run my 264WM so that the heal of the boat tail is just below the neck/shoulder juncture, this is how it was throated with .020" jump from that measurement.
If you have a restrictive magazine, then supply a dummy round at the MAX mag length (with .010" wiggle room) and have it throated .020" beyond that or a little more if you are using different/heavier bullets.

Cheers.

 

[LR Guru]

Bartlein will probably do an excellent job, but I have zero experience with them other than using their EXCELLENT barrels. It's really up to you if you use Bartlein or a smith
They require a dummy round (no primer or powder) so they can throat your barrel correctly. For instance, I run my 264WM so that the heal of the boat tail is just below the neck/shoulder juncture, this is how it was throated with .020" jump from that measurement.
If you have a restrictive magazine, then supply a dummy round at the MAX mag length (with .010" wiggle room) and have it throated .020" beyond that or a little more if you are using different/heavier bullets.

Cheers.

Okay what should I use as a reference for the dummy round? As in how long should I set my dummy round. My current max CBTO is 2.902. I currently shoot them at 2.862

 

[tobnpr]

Greg Tannel has an excellent video explaining the how and why...



It's always best to have a custom reamer ground to the exact specs- neck diameter and freebore- you want rather than re-working it. If it's otherwise SAAMI, extending freebore alone is relatively straightforward. That way, there's no question that it's exactly what you ordered. Given the cost of a custom rifle, $175 for a reamer should be considered as part of your project. Not usually needed on a hunting rifle, but target shooters will often have one or two additional barrels spun up at the same time for replacements.

 

[shortgrass]

Being your first 'custom;, there'd be nothing wrong with a SAAMI chamber.

 

[MagnumManiac]

I agree with Shortgrass.
I only mentioned the A191 chamber because you mentioned you were buying one.
That is what I chamber my F-class barrels with.
As to throat length, you want to be within xx distance while still being within your mag box length. For instance, a mag box that is only 3.400" long is too short for a SAAMI 300WM chamber, most chambers run a COL of 3.565" with most long bullets, while VLD bullets will push out beyond 3.600".

Cheers.

 

[Chamberman]

MCM Firearms will gladly do the work to your specs........

208-405-6000
Nampa, Idaho

 

[Danny1788]

why not just call Rhian? I don't know his wait times or if he's taking work on. PM him @ bigngreen

 

[LR Guru]

I agree with Shortgrass.
I only mentioned the A191 chamber because you mentioned you were buying one.
That is what I chamber my F-class barrels with.
As to throat length, you want to be within xx distance while still being within your mag box length. For instance, a mag box that is only 3.400" long is too short for a SAAMI 300WM chamber, most chambers run a COL of 3.565" with most long bullets, while VLD bullets will push out beyond 3.600".

Cheers.

I might run that route. Huntfarther told me to contact him because he has a reamer for his rifle builds that works great for the 215s. I'm not running a box mag just factory Floor hinged plate. I'm not scared to single feed either. I run SAP 2 shell holder. Also maybe do a SAAMI chamber will be better for my first build. If I run a 215 designed reamer I am basically stuck running that one bullet correct?