Latest test on 1'' cut on barrel length

[butchlambert]

For those that have not followed this, a CZ452 was the basis for the test. Velocity was measured at the factory 24.25" barrel, cut off an inch and shot again. The numbers to the right of the velocity is the 5 shot group at 50yds and 100 yds.
The barrel is at 17.25" long now.


posted Feb 25, 1:31 AM Hide Post
1. CCI STINGER 1545 FPS 0.6080 1.3968
1543 FPS 0.6682 1.7784
1558 FPS 0.7400 1.6696
1546 FPS 0.8796 1.7560
1539 FPS
1612 FPS
1592 FPS
1599 FPS

2. FIOCCHI ULTRASONIC 1272 FPS 0.5946 1.5954
1239 FPS 0.5806 1.5268
1259 FPS 0.9088 1.6456
1294 FPS 0.6586 1.8978
1262 FPS
1237 FPS
1230 FPS
1213 FPS

3. ELEY FORCE 1173 FPS 0.5338 1.3140
1188 FPS 0.4906 1.0982
1198 FPS 0.5276 1.2768
1191 FPS 0.5476 1.1766
1155 FPS
1151 FPS
1184 FPS
1196 FPS

4. CCI MINI MAG 1192 FPS 0.5454 1.1414
1213 FPS 1.1400 1.7902
1222 FPS 0.9944 1.9086
1228 FPS 0.6502 1.7822
1220 FPS
1214 FPS
1204 FPS
1215 FPS

5. SK STANDARD 1028 FPS 0.4446 1.3360
1033 FPS 0.5716 1.4686
1042 FPS 0.5280 1.0822
1059 FPS 0.4196 0.9898
1051 FPS
1042 FPS
1053 FPS
1049 FPS

6. ELEY SPORT 1015 FPS 0.7156 1.4130
1081 FPS 0.7246 1.4260
1084 FPS 0.4806 1.2700
1047 FPS 0.5640 1.4052
1099 FPS
1087 FPS
1064 FPS
1052 FPS

7. FIOCCHI SUBSONIC 1026 FPS 0.8764 1.7658
1027 FPS 0.6894 1.9966
1043 FPS 0.5572 1.4536
1061 FPS 0.8574 1.4620
1038 FPS
1037 FPS
1047 FPS
1050 FPS

8. ELEY CONTACT 1074 FPS 0.6510 1.2918
1067 FPS 0.6198 1.3132
1070 FPS 0.6756 1.6334
1071 FPS 0.6672 1.3652
1976 FPS
1080 FPS
1073 FPS
1075 FPS

9. LAPUA MIDAS PLUS 1045 FPS 0.5440 1.3748
1055 FPS 0.5858 1.5414
1084 FPS 0.5670 1.5556
1084 FPS 0.4938 1.0080
1111 FPS
1106 FPS
1105 FPS
1085 FPS

10. ELEY TENEX 1052 FPS 0.6104 1.2084
1066 FPS 0.6814 1.4264
1074 FPS 0.5412 1.2210
1061 FPS 0.4982 1.1566
1095 FPS
1071 FPS
1060 FPS
1047 FPS

 

[linekin]

Butch, please refresh my memory. The results at the top are from the shortened barrel or the original.
I've found it pretty interesting. Thanks for posting them.
Keith

 

[Boyd L.]

Thanks for posting.
Interesting that it appears best velocity (with these particular lots) falls roughly between 19.25” and 21.25” and not in the shortest barrel lengths.

 

[butchlambert]

Butch, please refresh my memory. The results at the top are from the shortened barrel or the original.
I've found it pretty interesting. Thanks for posting them.
Keith

The top figure is the original length barre;. Each velocity below that is with 1" shorter.

 

[butchlambert]

Thanks for posting.
Interesting that it appears best velocity (with these particular lots) falls roughly between 19.25” and 21.25” and not in the shortest barrel lengths.

Boyd, what it shows me is in all cases except one is the velocity, except in one case, is still faster than the 24" barrel.

 

[mongo chicago]

It seems to depend on the particular brand in a particular barrel legnth.

 

[watercam]

No wonder my 27" match barrel is only showing 1000 fps from RWS R50. Perhaps I should counter bore back to 20" and keep the weight of the rest of the barrel. Then there's cleaning all of that...
Thanks for the test results!

 

[Boyd L.]

No wonder my 27" match barrel is only showing 1000 fps from RWS R50. Perhaps I should counter bore back to 20" and keep the weight of the rest of the barrel. Then there's cleaning all of that...
Thanks for the test results!

A 18”-20” barrel fitted with a bloop tube will get you sighting radius and velocity. But if your rifle is consistent with its accuracy from a 27” barrel why change anything?

 

[tunered]

There is lots of info out there. Slower 22lr bullets buck the wind better than faster bullets. Most of the pressure in a 22lr is used up in 16 to 17 in. Long barrels for slowing down the shot.? I think so.