.22LR rim thickness test with Gemtech 42 grain and my CZ 452

[ehull20000]

I sorted 15 rounds of Gemtech 42 grain .22LR ammo and shot them through my CZ452 at 30 meters.  I was shooting prone off of my concrete garage floor with a rear bag and a tripod in front.  I have a 3 x 9 scope on this rifle and shot with my suppressor installed.  Mirage was light as was the wind.  The 1.795 group is around .7".  

 

 

I placed each round of .22LR into a spent .223 cartridge and used my calipers to measure the overall length and sorted them into three sets.  

 

1) those closest to 1.795

2) those under 1.795 which I labelled 1.794

3) those over 1.795 which I labelled 1.796  

 

These are my results.  I'm not a great shooter by any means so some of the variation with the groups is my fault, but I think there is promise with this process and with this gun / ammo combination.  I have read a bit about this largely being a waste of time and that instead buying premium ammo (Eley Tennex?) is a better way to ensure consistent groups.  This is just the first experiment for me and I'll repeat this a few times to see what I come up with.  My local gun shop regularly carries this and I make it a point to buy two boxes, and only two boxes, each week I visit the shop and find it in stock.  

 

 

 

[DWARREN123]

Fun to experiment especially with 22lr and a decent rifle. I have found in most cases the older CCI Blazer was a very good target round from a CZ 22lr rifle.

Barrel length can also play a important part in velocity and accuracy. I use to go to "Rimfire Central" and there were always a lot of folks doing work ups like this.

[Guest mechanically]

That's... remarkable!

 

I'm glad you shared, and looking forward to more summary, especially since I've got several 452s myself!