250 Savage Case Question

[brstevns]

Does anyone know the correct ID of 250 Savage brass. What reamer would work?

[GRUMPA]

It all depends on how your doing them in the first place. I only do mine with the expander removed, then ream, then run them through the sizing die again only this time I do it with the expander rod in place...

[EDG]

I have one of the very useful sets of RCBS dies used to form .250 Savage from .30-06 or .308.
The set consists for a form die #1, form die #2, trim die, reamer die and reamer.

The neck reaming die had a .283 diameter for the neck. The reamer and reamer guide section of the die measure .256.
The die diameter numbers were taken with .001 increment gage pins.

I have never used this set for reaming since I prefer to turn necks when possible.

To turn necks I measure the chamber neck and then turn the case to give .002 to .003 clearance when loaded.
For a bench rest rifle I use .0005 to .001 clearance when loaded but this is not recommended unless you are very careful measuring cases and able to measure to the nearest .0001 reliably.

[brstevns]

It all depends on how your doing them in the first place. I only do mine with the expander removed, then ream, then run them through the sizing die again only this time I do it with the expander rod in place... This is what I was going to do. Going to form some from 308 brass. Can you tell me what reamer to use or inside neck diameter once you have reamed?

[GRUMPA]

It's all math, once you size the 308 brass down to 250Sav you accurately measure the O.D. and I.D. to get the proper size. Reason I bring it up is sizing dies have been known to be a bit different, which results in a neck diameter difference. Anyway I use a .247 reamer when I do those, and no I don't have any bullets to check the neck diameter when done.

[brstevns]

It's all math, once you size the 308 brass down to 250Sav you accurately measure the O.D. and I.D. to get the proper size. Reason I bring it up is sizing dies have been known to be a bit different, which results in a neck diameter difference. Anyway I use a .247 reamer when I do those, and no I don't have any bullets to check the neck diameter when done.
Please correct me if I am wrong. I was thinking the ID of the brass should be .003-.004 under bullet diameter ?

[GRUMPA]

It should be around that but after you reamed and run the brass through the sizer die once again with the expander rod in place.

[brstevns]

It should be around that but after you reamed and run the brass through the sizer die once again with the expander rod in place.
Sounds like a plan, going to give it a try in a few days. Thanks again.

[Texas by God]

Unless you are converting .308 to .250 Sav for fun and presision, I'm going to play Captain Obvious and say what about necking up 22-250? Best,Thomas.

[GRUMPA]

Unless you are converting .308 to .250 Sav for fun and presision, I'm going to play Captain Obvious and say what about necking up 22-250? Best,Thomas.

Most of the time folks are going to want a parent case both cheap and plentiful. Although using 22-250 brass may be the better of the 2 it's neither cheap nor plentiful compared to 308 brass.

[brstevns]

Most of the time folks are going to want a parent case both cheap and plentiful. Although using 22-250 brass may be the better of the 2 it's neither cheap nor plentiful compared to 308 brass.
That says it all.

[EDG]

The ID of the brass only counts after it has been sized. Prior to sizing it is the neck wall thickness that is important.

Most of RCBS expander balls are .001 to .0015 smaller than the bullet diameter. That is why the .256 reamer is used with the RCBS .250 Savage reamer die. This reamer die has a neck that is .283 in diameter. That gives you a case neck thickness of .0135 per side which is a pretty common thickness for factory brass.

Most sizer dies will make the sized case neck .003 to .007 undersize before the ball is pulled back through the neck. The .001 under size (.2555 to .256 diameter) expander ball will open the neck back up.


Please correct me if I am wrong. I was thinking the ID of the brass should be .003-.004 under bullet diameter ?

[Texas by God]

Most of the time folks are going to want a parent case both cheap and plentiful. Although using 22-250 brass may be the better of the 2 it's neither cheap nor plentiful compared to 308 brass. Hey Grumpa do you make .250 Sav brass? If so how much do you charge per 100? About like 22-250 brass?? Just considering labor you know. Best, Thomas.

[Texas by God]

I did not mean to offend. Just speaking my mind is all. Best, Thomas.

[GRUMPA]

Hey Grumpa do you make .250 Sav brass? If so how much do you charge per 100? About like 22-250 brass?? Just considering labor you know. Best, Thomas.

Just read my signature, everything is there....

[triggerhappy243]

I am also working on making 250 savage brass. I have a sheeiite load of .243 brass. My question would be more about internal case capacity.............. compared to factory 250 savage brass.