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-   -   Observations about longer barrel, etc. (http://glocktalk.com/forums/showthread.php?t=1240088)

jeffreybehr 07-07-2010 21:42

Observations about longer barrel, etc.
 
1. The 5.15" LW barrel makes more of a velocity difference than I thought it would. With 4 different identical loads, velocities are almost 100FPS higher.

2. This LW 5.15" barrel is also the most-accurate I've had in any of my Glocks. For instance, today's 20 5-shot groups averaged 3/10-inch smaller than the essentially same loads shot over the weekend thru the original barrel.

3. After a little preliminary velocity measuring Tuesday nite, the groups I shot today were strings with lower charges of Longshot and A7 and 4 loads of A9 creeping up to what I thought I wanted. Turns out 3 loads--1 with A7 and 2 with A9--of the 9 loads I shot had too-HIGH velocity for my desires for a 155g. PD load. Some may, but I don't need a PD load generating 10' velocites over 1375FPS, but it's sure a nice problem to have. :embarassed:

4. Based on ONE batch of 18 groups from 9 different loads, so far the loads with A9 are generating the smallest groups, but that's only by a tenth of an inch at 10 yards.

I sure am liking this.

http://i89.photobucket.com/albums/k2...rrel_1000w.jpg

Maine1 07-07-2010 23:18

i like your rig. Have been really tempted to get a 5.15 barrel, too.

I was just on the longslide forum, thinking it would be a good idea to cook up a 20L

I MAY just get a blacked LW slide, as it has the bullnose i like, and get a blacked and blind marked 5.15 barrel, giving me a mini-long slide, sans some of the weight.
Of course, money is the only thing stopping me..

_The_Shadow 07-08-2010 19:15

Yes the longer barrels allow the expanding powder gases to give a little more push for a little long resulting in the high velocities you are seeing.

LooK at the site for actual test done...http://www.ballisticsbytheinch.com/10mm.html

ctkelly 07-08-2010 21:37

I think what the OP meant was he was surprised by the increase in velocity from a barrel that is just .55" over the factory length. 100 FPS increase just from a half inch longer barrel is pretty impressive.

jeffreybehr 07-11-2010 01:14

Quote:

Originally Posted by ctkelly (Post 15607109)
I think what the OP meant was he was surprised by the increase in velocity from a barrel that is just .55" over the factory length. 100 FPS increase just from a half inch longer barrel is pretty impressive.

Indeed.

(My 1st attempt at a response was 'Yup!', but that was too short for the system to accept.)

MSgt Dotson 07-14-2010 09:26

The LWD barrel also has a tighter chamber, allowing less pressure to be 'wasted' expanding/fireforming the case to swell in the factory barrel...

I see 50 fps greater velocity with a 5.3" Lone Wolf barrel (980 fps) over a 5.3" Glock (930 fps) factory bbl, chroning each with the same .40 handload two minutes apart...

Cam Cooke 07-21-2010 11:29

I have a 5" KKM barrel in my G20 and a 4.25" Storm Lake barrel in my G29 I was very surprised at the velocity gains that I saw from my loads.

cwb 07-21-2010 12:16

I have a stock barrel and a LW 6" barrel and I have never seen more than a 60 FPS difference. It usually ranges from 40 to 55 FPS.


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