Quote:
Originally Posted by RAY1946
Recently I purchased a used Luger, this being a Mauser Parabellum in 9mm with a 6" barrel. I decided recently to begin reloading for this pistol. Yesterday I slugged the barrel and found the groove diameter to be a whopping .3585! Is there enough room in the chamber for a bullet this large?
I have seen many old pictures of Lugers with what appeared to be a truncated bullet of I guess WWI design. Is this a good design for the Luger? Lyman has a mold which seems to duplicate this design;356402.
I am new and would like to say thank you to everyone. This is a really cool site with lots of great info!....................Ray
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Hi
The original DWM 9mm groove diameter was 9.1 or 3.58, so your Interarms Mauser would appear to be in the same neighborhood.
The truncated cone bullet types work best in a Luger if the OAL is held to the original DWM standard of 29mm. Yes, I know that part of the lube groove will be exposed, but so what.
I perfer the 124 gr. RCBS Lead Truncated Cone 9mm bullet, because it is more accurate in my various Lugers.
As to your specific question regarding bullet diameter, perhaps the Interarms' newer design chamber will take a 3.58 bullet (because it has no "step" as the original DWM chamber has) but an original DWM chamber will take only a bullet of about .3565, so proceed with extreme caution when experimenting with larger bullets in your Interarms Luger
The Luger will shoot very accurately with 3.56 diameter lead 124 gr. RCBS Truncted Cone bullets (seven touching at 25 yards) with no problem at all!!
To save you weeks of effort, Accurate No 5 is the best powder I have found for this bullet. The accuracy load will be at about 1,070 fps or so, closely matching the original DWM military load.
Search my name and you will find a comprehensive post on the RCBS 124 gr. TC lead bullet and Accurate No5 powder.
Sieger