they are defiantly .22 Magnum projectiles I bought 400 of them from Reloaders Supplies in the 1970's
Winchester sold them in bulk and Reloaders sold them in bags of 200, Winchester also sold primed .22 Mag brass
There was a fad of making wildcats out of the .22 Mag necking them down to .12" .14" .17" .19" and .20"
I shot them in my .22 Hornets with 296 the velocity was 3120FPS deadly on possums
I wouldn't use them in a fast twist they will not handle the high RPM better to use 40gr Vmax.
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