300 Win Mag reloading Problem

[Mr.Knowit all]

Sounds like your dies are different than your chamber. Sounds crazy but happens more than you think.

 

[rsmithsr50]

"I’ve got a Rem 700 loading 212ELDX Using 73.2 grn of H1000 with an OAL of 3.610
Im fairly new to reloading and"

how did you determine the 3.610 was correct for your chamber ?
how did you set up your sizing die ?

 

[46and2]

"I’ve got a Rem 700 loading 212ELDX Using 73.2 grn of H1000 with an OAL of 3.610
Im fairly new to reloading and"

how did you determine the 3.610 was correct for your chamber ?
how did you set up your sizing die ?

These two tools are good for a new reloader to have.
This should get you close to what you need to know about how to set up your sizing and seater dies correctly.
https://www.hornady.com/reloading/p...tools-and-gauges/oal-gauges-modified-cases#!/

https://www.hornady.com/headspace-bushings#!/

 

[bozo699]

http://www.larrywillis.com/300winmag.html

Belted magnum collet resizing die.

Resizes the case body in the area forward of the belt, which is hard for a normal sizing die to do on a belted magnum case.

there’s a member on here sells dies just for that!
Wayne

 

[Nevanevan]

there’s a member on here sells dies just for that!
Wayne

I recently broke down and spend the $200 Canadian to get this die in my hands. And IT IS WORTH IT! No more tight chambering and guessing if the round will squeez in or not. It adds another step, but all of us on this site like to play with our dies, so its not a big deal.

 

[bozo699]

I recently broke down and spend the $200 Canadian to get this die in my hands. And IT IS WORTH IT! No more tight chambering and guessing if the round will squeez in or not. It adds another step, but all of us on this site like to play with our dies, so its not a big deal.

well if I had payed attention to SWRichmonds post it has the guys name on it I couldn’t remember Larrys name, I bought his day a number of years ago for a stiff closing .300 win mag and it did it’s job well.
Wayne.

 

[mytwo60]

Try chambering the sized brass only. Does it fit? What type of dies do you have? Also, full length sizing with expander ball sometime will pull the neck back thus extending the neck length.

If the sized brass chambers fine then only thing left is the OAL.

 

[justme]

[QUOTE="rsmithsr50, post: 37688278, member: 131

 

[justme]

Might your seater die be bumping the case mouth and trying to crimp? That will swell out the shoulder?

 

[FrankG]

When I first started out I had a Steyr in a 300 and custom 300. No matter how I sized my brass the one would not want to chamber in the other. Looking back that was dumb to do but in theory the SAMI specs should have worked with each other at least been close and it was not. Since then if I have multiple rifles of the same caliber I keep the brass separated. Maybe your chamber is a bit off from your dies..just a little? Or you are sizing too far one way or the other? I even contacted Larry Wills and bought his Collet die for belted magnums. He may be able to help. Good luck?

Just because you have two different rifles with a SAAMI spec chamber as you figured out you should keep the brass separated etc...

But the factories can use a SAAMI min spec chamber and or what is called a production chamber. Production chambers tend to be looser/bigger dimension wise. Just because it was done at the factory don’t assume you got a SAAMI min spec chamber.

Later, Frank
Bartlein Barrels