9mm Luger COL

General reloading

Moderator: Grantness

Post Reply
Posts: 320
Joined: 04 Sep 2008, 09:21
Location: Missouri

9mm Luger COL

Post by EmptyBrass » 30 Aug 2009, 08:17

What are you guys using for your COL on a 115 gr FMJ? I'm loading Win FMJ

What Hornady recommends is shorter then any factory round I can find. (1.10) Its almost pushing the bullet all the way into the case.

I measued an American Eagle loaded round and it measures 1.152. Which is closer to the Max COL of 1.169.

Win USA is 1.163 This is the one I'll probably use.

Senior Member
Posts: 4678
Joined: 19 Aug 2008, 09:13
Location: Virginia

Re: 9mm Luger COL

Post by Grantness » 30 Aug 2009, 09:43

1.10" is probably a little on the short side. What is the most accurate factory round in your gun? Maybe try using that OAL. You can always be methodical about it and test the accuracy of rounds w/ varying OAL's (say .005" increments.). Every gun is different, chambers have different throats, etc. You need to find out what works in yours.

One technique that I've heard MO mention is to cut a slit down the side of a sized case and insert the bullet you want to use. Chamber the dummy round, pull it out, and measure that OAL....then subtract ~.05" (or whatever you like) to give you a good OAL to use for that round in your gun.

User avatar
Senior Member
Posts: 3089
Joined: 06 Dec 2008, 00:56
Location: Lone Star State

Re: 9mm Luger COL

Post by fatherfoof » 30 Aug 2009, 21:01

Being lazy, I tend to find a factory round that always works, set the equipment for that exact length, and so far it's been foolproof. Now that I said that, watch my next batch be all screwed up.
Please PM Me for LE/Military Access

The Keymaster
Senior Member
Posts: 546
Joined: 19 Jun 2009, 04:37
custom title: Keeper Of The Keys
Location: Northwest Indiana

Re: 9mm Luger COL

Post by The Keymaster » 31 Aug 2009, 04:04

It varies a lot by firearm. As an example, I loaded 200 rounds at 1.145 with 4.8 gr of AA2. They were incredibly accurate in my Walther PSP, and they totally sucked in my Sig P229. I made another 50 at 1.150 with 4.8 gr of AA2 and was totally amazed at the difference in the Sig. Bottom line, .005 does make a difference.

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest