.22—-JSB 13.43s and 14.3s

I also have some unused tins of them. In my experiance you have to shoot them with lower speed, than the heavier ones. I got them to shoot well at around 750-830 fps. Going faster than the 830 range seems not to be succefull in my gun, a .22 FX crown. 

To be clear, I have not tried the 14.3 grains. It is the 13.43 grain JSB exact, which I had to slow down on speed, on my gun.

You can probably get them to group slower than 750fps also. It depends on the setup of the gun. 

I know everyone is JSB this and JSB that, give Wally world CPHP a try @850-900fps, this is at 100 yards with a light wind.