Shooting 6" low - FIXED!

[lklawson]

A few weeks ago I took my new-to-me Smoke frame R51 out to the range.  It was shooting 6" low at 35 feet.  @%^#&*$@%!!!  This was strange because my black R51 is spot on.

Then I lent it to a friend.  As I was demonstrating it, I loaded a laser training cartridge into it and it was hitting dead-nuts.  Huh?

Eventually, I realized that I was using the laser training cartridge with my street glasses.  Tri-focals.  And I was looking at them through the proper lens.  When I was shooting at the range, I was using my safety glasses, with mono-focal corrective lenses.  It's supposed to be the same focal point as the same lens I was using with my laser cartridge. 

So I went back to the range and checked my bio-mechanics.  I found that I was tilting my head down a little, in a sort of more aggressive body position.  This aligned my eyesight through the top 1/3 of my lenses.  Remember, they're mono-focal.  Supposed to be the same focus no matter what part of the lens I'm looking through.  but changing the point I was looking through the lens very subtly added a bit of unexpected parallax.   It wasn't much but it changed my POI.

When I moved my head up to a more erect posture, my groups moved to the exact right spot.

Lesson learned.

Peace favor your sword,
Kirk

[sebvox]

Very interesting.  I'll have to try different head positions next time I'm at the range, even though I wear my bifocals when shooting.