Looking for Erik Cortina-style Expanding Mandrel Die for .300 Norma Magnum – Alternatives?

[ypmishra]

I’ve been using the Erik Cortina expanding mandrel die setup for my 6.5 PRC with excellent results—particularly in eliminating “clickers” by addressing the lower part of the case that standard full-length dies typically miss.

Unfortunately, this system isn’t available for .300 Norma Magnum yet. I reached out to the company directly, and they confirmed it’s in the works but not currently offered. I’m in need of a comparable solution now.

Has anyone seen or used a similar expanding mandrel system that works for .300 NM and addresses the web area of the case?

Also, are there any standard full-length sizing dies (Redding, Forster, Micron, etc.) that are known to size all the way down to or below the .200” line on the case?

Would appreciate any leads or first-hand experience. Thanks in advance.

 

[Schw15]

Micron dies will size more and you will have no issues with clickers. I run them in the 300 norma improved

 

[ypmishra]

Micron dies will size more and you will have no issues with clickers. I run them in the 300 norma improved

Thanks you. Does it size below the .200 mark. That’s what the Erik cortina die for the 6.5PRC does and has helped

 

[Schw15]

Thanks you. Does it size below the .200 mark. That’s what the Erik cortina die for the 6.5PRC does and has helped

I don't think it will size that much just at the .200 line.

 

[4O6shootist]

Lapua 300 norma brass is tough as hell. If you're having interference issues upon extraction, you're either loading too hot, or have a poor fitment of chamber and brass. I will echo the micron dies from BC are likely the tightest base sizing of all available I use them in prc, Saum, and Norma imp. The most important dimension is the 200 line on the chamber reamer, it needs be 0.5874-0.5879 if you plan to really lean on it.

 

[ypmishra]

I bought 600 pieces of Norma brass. Having said that I have Lapua brass in 6.5PRC and it has clickers all the time

 

[4O6shootist]

I bought 600 pieces of Norma brass. Having said that I have Lapua brass in 6.5PRC and it has clickers all the time

Lapua prc VS their norma/lapua brass are on completely different spectrums. Their prc brass is underwhelming at best, I honestly don't even think they make it, because it is so not-lapua like. However I've not had issues with my latest lapua 65prc brass, 535 chamber base and a tight ass die are mandatory for any prc chamber.

 

[806guns]

Im looking for the same thing. I will be using the redding bushing die. But want to use a mandrel.

 

[Part Timer]

Keep an eye out for SAC and 419 sizing dies that use mandrels. Not released yet for the NM, but should be coming in the next couple of months.

 

[806guns]

I will just use a 21st century mandrel die body for now

 

[Part Timer]

Makes two of us.