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unspellable · 09-14-2006, 03:28 PM

When necking down a case from one caliber to another, pay attention to the outside neck diameter of the loaded round. The neck walls get thicker and you may run out of neck room in the chamber. This will cause the bullet pull to go up and can lead to over pressure.

I first ran into this converting 9.3 X 74R brass to 400-360 Purdey. Both have about the same bullet diameter but one has to shorten the brass and squeeze then squeeze it down. This makes for thick neck walls. The 400-360 Purdey has rather thin neck walls to start with so I had to thin the neck walls with a neck reamer.

This may or may not be a problem with the conversion here, but be sure to check and KNOW it's not a problem. Easier to check neck space than to glue your Luger back together.

To date, I've been using once fired brass from factory loads. As I recall Starline makes 30 Luger brass, might be worth while checking their prices. I've also bought Winchester brass on eBay pretty cheap.

09-14-2006, 03:28 PM	#6
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 769 Thanks: 0 Thanked 19 Times in 11 Posts	Necking down caveat When necking down a case from one caliber to another, pay attention to the outside neck diameter of the loaded round. The neck walls get thicker and you may run out of neck room in the chamber. This will cause the bullet pull to go up and can lead to over pressure. I first ran into this converting 9.3 X 74R brass to 400-360 Purdey. Both have about the same bullet diameter but one has to shorten the brass and squeeze then squeeze it down. This makes for thick neck walls. The 400-360 Purdey has rather thin neck walls to start with so I had to thin the neck walls with a neck reamer. This may or may not be a problem with the conversion here, but be sure to check and KNOW it's not a problem. Easier to check neck space than to glue your Luger back together. To date, I've been using once fired brass from factory loads. As I recall Starline makes 30 Luger brass, might be worth while checking their prices. I've also bought Winchester brass on eBay pretty cheap.