300 RUM Reamer Spec

[Earnhardt]

I've had pretty good luck so far with my Factory Rem 700 Sendero 300 RUM

When the time comes for a new barrel (or maybe sooner) I'm wondering what you 300 RUM guys are using for a reamer?
SAAMI Spec?

The Throat my 700 Sendero has has plenty of freebore to seat the bullets out (yes, I'm using it as a single shot) Does Remington use the SAMMI spec reamer? Or are they using there own reamer spec for their 300 RUM's?

Neck turning or standard neck?

Thanks

 

[Elk Hunter 338]

300 RUM is my favorite 30 cal factory option!!!
yes remington is using a sammi reamer
almost anyone building new customs have their own min spec match reamers
when you do build on it have a wyatts CFE-9 installed in your action and ask the gunsmith to throat it accordingly for this extra mag space with the bullets of your choosing!

 

[Earnhardt]

Thanks man!

 

[Tumbleweed]

Elk Hunter 338 says it best. To be a little more specific...make sure the throat dimensions on your reamer are around .3084-.3085" at the largest. This promotes excellent bullet alignment with the bore even when brass concentricity isn't perfect. Have it throated specifically for the bullet you are using

 

[AZShooter]

I had one made by Pacific Tool and Gauge. Dave told me through some research they found out that the 300 RUM shot better with a throat angle that was not their usual 1 1/2 degree. I am happy with the results.

I happened to help a friend with his Proof Research in 300 RUM which was also easy to work up a load and shot very accurately, just like mine. I called Proof to ask about action torque and complemented them on their rifle that shot so well. Asked about the reamer and discovered I had the exact same reamer they use!

If you are interested in knowing more PM me.

 

[Tumbleweed]

I had one made by Pacific Tool and Gauge. Dave told me through some research they found out that the 300 RUM shot better with a throat angle that was not their usual 1 1/2 degree. I am happy with the results.

I happened to help a friend with his Proof Research in 300 RUM which was also easy to work up a load and shot very accurately, just like mine. I called Proof to ask about action torque and complemented them on their rifle that shot so well. Asked about the reamer and discovered I had the exact same reamer they use!

If you are interested in knowing more PM me.

Glad it worked out and you're happy. He told me the same thing when I designed my RUM reamer. I did .3084" with .5" long throat. Great for speed but is finicky with certain bullets

 

[Earnhardt]

Glad it worked out and you're happy. He told me the same thing when I designed my RUM reamer. I did .3084" with .5" long throat. Great for speed but is finicky with certain bullets

.500" freebore?

 

[Tumbleweed]

.500" freebore?

Yes sir

 

[Elk Hunter 338]

Yes sir

MY GAAAAUUUUDDDDDDD!

 

[Earnhardt]

Dayuuum!
That's like sticking your head down in a well, and yellin, "Hello down there!"

What is SAAMI free bore on the 300 RUM?

 

[Buttermilk]

If I'm not mistaken, the SAAMI freebore is 0.114".

My 300 RUM chamber has 0.098" freebore, 0.343" neck diameter. Shoots real good.

 

[Edd]

Here is a SAAMI reamer print.......

 

[Tumbleweed]

MY GAAAAUUUUDDDDDDD!

Lol! Great for speed, has been somewhat finicky. It likes the 225 ELD-Match at 3255fps. Next RUM will have a match throat set up specific to the bullet i use. I'm on the last 25% of barrel life

 

[Elk Hunter 338]

that sucker has to be barely hanging on by a thread in the brass.. ha ha ha ha ha