7.65mm (.30) Luger Ammunition

unspellable · 02-06-2004, 02:54 PM

OK! First, don't take any deals on cheap thermal printer paper! A lot of my chronograph printouts have faded until they are unreadable. I'm going back to quality paper! Here are some surviving notes.

Winchester claims 1220 fps from a 4.5 inch SAAMI pressure barrel. THe original DWM specs for the 1920 commercial call for 1220 fps from a 98 mm barrel (slightly less than 4 inches.), the actual pistol, not a test barrel. The SAAMI test barrel is, among other things, bored to the minimum SAAMI diminsions for chamber and groove diameter. In addition to diminsional differences, you can knock 10 to 15 fps off the fixed test barrel figures for operating the pistol action. You can add 2 to 3 fps to my measurements to correct for the difference bewteen muzzle velocity and the five foot trap distance. You will note that in the range from 3.5 to 5.5 inches the barrel length makes a noticable difference in velocity.

I found in my notes:

Average of 1048.3 fps from a 4 inch DWM mismatch.

Average of 1184.3 fps from a 42 Mauser apparently rebarreled to 7.65. This one has a like new bore.

Average of 1196.0 fps from a 6 inch Mauser re-intro in as new condition.

I have other records that I haven't found yet.

02-06-2004, 02:54 PM	#10
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 769 Thanks: 0 Thanked 19 Times in 11 Posts	OK! First, don't take any deals on cheap thermal printer paper! A lot of my chronograph printouts have faded until they are unreadable. I'm going back to quality paper! Here are some surviving notes. Winchester claims 1220 fps from a 4.5 inch SAAMI pressure barrel. THe original DWM specs for the 1920 commercial call for 1220 fps from a 98 mm barrel (slightly less than 4 inches.), the actual pistol, not a test barrel. The SAAMI test barrel is, among other things, bored to the minimum SAAMI diminsions for chamber and groove diameter. In addition to diminsional differences, you can knock 10 to 15 fps off the fixed test barrel figures for operating the pistol action. You can add 2 to 3 fps to my measurements to correct for the difference bewteen muzzle velocity and the five foot trap distance. You will note that in the range from 3.5 to 5.5 inches the barrel length makes a noticable difference in velocity. I found in my notes: Average of 1048.3 fps from a 4 inch DWM mismatch. Average of 1184.3 fps from a 42 Mauser apparently rebarreled to 7.65. This one has a like new bore. Average of 1196.0 fps from a 6 inch Mauser re-intro in as new condition. I have other records that I haven't found yet.