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Discussion Starter · #1 ·
I bought a Ruger 10/22 and needed it's muzzle velocity to get its bullet trajectory from JBMBallistics. So I used CCI Mini Mag 40 grain and shot off ten of them with a MagnetoSpeed sensor attached to the barrel. The CCI package states the velocity is 1235 FPS. Below are my speeds out of the 18 inch barrel. Bullet count is now 14, four on initial purchase and ten for this test.

As this was a new rifle I got hold of a rifle with maybe three hundred rounds through it and measure it's muzzle velocities also.

New Ruger 10/22 Used Ruger 10/22 (About 300 rounds count)

Bullet No. Velocity FPS Velocity FPS

1 1238 1172
2 1179 1163
3 1165 1185
4 1158 1224
5 1186 1195
6 1196 1188
7 1204 1166
8 1199 1177
9 1201 1180
10 1194 1163

Average Vel 1192 FPS Ave 1181
Std Deviation 22.3 FPS SD 18.4

The average velocity only varies from the printed box velocity by about 3%. That could be due to the shorter barrel length. I think that's pretty good for a mass produced product.
 
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