Results 1 to 10 of 21
-
03-07-2020, 11:24 #1
- Join Date
- Feb 2012
- Location
- Pretoria
- Posts
- 3,327
.22LR Barrel length reduction chrono results
.22LR Barrel reduction chronograph results
This was a basic test with what loads i had available at the time.
I went through the process of having the barrel on my CZ 455 reduced. Formalito had a 16" demo 457 at Huntex and loved the looks and how it seemed to handle. Unfortunately the first batch of 457s were a lot more than the 455s floating around. After doing some reading up and also not being able to find a 16.5" model at the time , I decided on the chop. The model was a brand new 455 Lux, it comes with iron sights. Now i dont mind supressors and threading of rifle barrels provided its not a vintage collectors item. Mass produced CZ does not fit that criteria, and I also had no intention of using the iron sights. I shot about 200 shots with it before going ahead with the barrel chop.
I contacted Master gunsmith Oom Danie Joubert for the cutting and threading, and got an ASE Eco suppressor from him as well.
The test was done without suppressor attached. In hindsight i should have also tested with the suppressor to note any differences.
Rifle Setup
CZ 455 Lux
Stock barrel 21"
Chopped barrel 16.5"
Leupold VX Freedom Rimfire scope
The following brands were tested.
This is what i had available to me at the time.
CCI Quiet 22(big fan of this load for a specific purpose)
S&B sub sonic HP 40GR
Aguila Super Extra 40Gr Eley Prime(horrible smelling stuff)
Aguila Super Extra 40Gr Aguila Prime
SK Standard Plus 40gr
I made sure i used the same ammunition from one box, so that its from the same batch.
The listed velocities are a 10 round Average.
Brand Velocity Listed on box Velocity Pre chop(21") Velocity Post chop (16.5") Difference CCI Quiet 22 710fps 659 756 +97 S&B sub sonic HP 40GR 1017fps 1064 1094 +30 Aguila Super Extra 40Gr Eley Prime 1130fps 1059 1108 +49 Aguila Super Extra 40Gr Aguila Prime 1130fps 1045 1100 +55 SK Standard Plus 40gr 1073fps 1040 1065 +25
From the chronograph results, we can see an increase in velocity in all 5 loads tested. The CCI Quiet velocity probably shows due to the minimal powder being used, there is a larger decrease in velocity than other loads. Gunsiters can give thee analysis of the results.
In terms of the reduction of the barrel, i achieved what i wanted, a shorter handier .22 bolt action.
Hope you guys find this interesting, albeit non scientific.
-
03-07-2020, 11:30 #2
- Join Date
- Jan 2010
- Location
- Pretoria
- Age
- 34
- Posts
- 839
Re: .22LR Barrel length reduction chrono results
Really interesting thanks! I have a Brno Mod 2 that might just get chopped.
Any difference in accuracy observed?
-
03-07-2020, 11:35 #3
- Join Date
- Feb 2012
- Location
- Pretoria
- Posts
- 3,327
Re: .22LR Barrel length reduction chrono results
Accuracy wise, I really didn't shoot many groups besides the CCi and Aguila before the reduction. Aguila was already shooting really well before the chop, post reduction both loads seemed to have tightened up slightly. Another thing I should have done as well with all the loads was accuracy testing.
-
03-07-2020, 11:36 #4
- Join Date
- Oct 2017
- Location
- Western Cape
- Posts
- 728
Re: .22LR Barrel length reduction chrono results
Please add a photo of said rifle, with and without suppressor?
-
03-07-2020, 11:43 #5
- Join Date
- Nov 2017
- Posts
- 6
Re: .22LR Barrel length reduction chrono results
Thanks for the info Antlion, you made up my mind too, I was going to shorten my 455 barrel to 18” but will shorten it to 16.5”. Testing may not be “scientific “ but real world data goes a long way in my books
-
03-07-2020, 11:45 #6
- Join Date
- Apr 2019
- Location
- Cape Town
- Posts
- 1,784
Re: .22LR Barrel length reduction chrono results
Very interesting results Antlion. Dit you give the barrel a good clean and then fired enough rounds to lead it back up before doing the tests pre and post chop?
The results you got is the opposite than I expected.
-
03-07-2020, 12:50 #7
- Join Date
- Dec 2010
- Location
- Boland
- Posts
- 7,985
-
03-07-2020, 13:11 #8
- Join Date
- May 2010
- Location
- Right next to the pot that needs stirring.
- Age
- 45
- Posts
- 2,157
Re: .22LR Barrel length reduction chrono results
This is interesting. I have CZ and a 10/22. Have never shot them both on the same day with the same ammo over a chronograph. Have shot S&B Sub Sonic from the 10/22 the other day and they clocked average of 1040 fps.
-
03-07-2020, 13:23 #9
- Join Date
- Jun 2020
- Location
- Cape Town
- Posts
- 5
Re: .22LR Barrel length reduction chrono results
Great stuff.
FWIW, here is a resource that I came across the other day - it was an exercise specifically looking at the impact of barrel length on muzzle velocities across a range of calibres and ammunition.
http://www.ballisticsbytheinch.com/22.html
-
03-07-2020, 13:25 #10
- Join Date
- Jul 2012
- Posts
- 7,260
Re: .22LR Barrel length reduction chrono results
I was planning on shortening my Sako Quad barrel. As 16" is said to be enough for a 22lr to burn all powder. The twist rate on it is however 1/18. So I am still pondering. On cutting shorter then the twist rate. Or allowing the bullet to make complete turn before exiting
Bookmarks