Flaring JSB 15.9's skirt in RSI mags so no light is seen

[JamesD.]

The Rainstorm is regulated 861fps avg w/ 18.1's & 880fps w/ 15.9 JSB's. 

Well, it's a tack driver but let's make sure no blow by is giving a variance. Results will be posted as soon as I have them.

Think I'll see a difference?