Sizing for 300 BLK?

[borg]

For those folks that shoot PC cast through their 300, what size expander do you use for what diameter.
I know the expander needs to be a little larger that so that you don't put too much squeeze on the CB, but was wondering how much for good retention.
I guess I could get the M die expander larger and turn it down.
TIA

[xacex]

I use a 30 carbine powder drop expander in my lee 300 blackout powder drop die. I had to run a 3/8" drill bit in the die body, but it works great, and you can adjust the flare just like an M-die. No real need for a larger expander ball/ pin in your size die.
Edit: This is what it is. 3$ part...https://fsreloading.com/lee-precisio...m1-se2291.html

[borg]

Thanks, but I'm more worried about the case neck below the flare. I read somewhere that it was a problem having a tight fit had a tendency to reduce the size of the CB.
I have the standard M die for 30 cal, just wondering about going larger to expand the length of the neck.

[kbstenberg]

Borg why don't you pull one of your loaded rounds and see if the bullet has been reduced in size?
Another remady is to make a harder bullet.

[kweidner]

I use the 30 m die short. Couple washers between the stem and expander and it works great.

[Beesdad]

I have used both the .30 carbine and the Lee universal expander ... Both work well.

[borg]

I really didn't want to pull any boolits,, too Purdy. LOL
I have both the long body and the short body M die, I also have the 30 carbine expander.
I was just wondering if anyone had problems with the boolit being sized down when seating in a very tight case.

[Smoke4320]

30 carbine expander here .. no issues in well over 1000 rds of several different loads and bullet mold types

[popper]

Only way to tell is to pull a couple before you crimp! Size bout a thous. above bore, expand bout a thous. under boolit size. BO bores are all over the place.

[borg]

So you are saying that if my bore is .308 and my cast boolits are sized .309, that I need to have an expander at .308.
All my expanders measure .306, so your talking .003 difference which is why I asked the question to make sure it's not to tight.

[xacex]

The 30 carbine expander opens the neck a little as well as flare the case neck.

[popper]

Mine shoots well sized 3085, the Lee expander was 306 so I took it to 305 - 306 appeared to be too loose. I measure with a HF digital cal., not the best but it works. It's a custom barrel so I assume 308 but it's 1:10. The stock 1:7 would shoot 311 (307 expander) fine. Neither would take brass over 333 on the neck.