Stalker, you're measuring most other guns at 2 times or more the velocity of the springer. Chronos can be notoriously unreliable as velocitites increase, and a 5% variance at 200 fps may translate into 10-15% variance at 500 fps.
If you try a battery-powered light source, and you still get wild drifting, ignore the voltage element as you will have bypassed that.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.