How can flyers be blamed on parallax?
The change of angular position of two observations of a single object relative to each other as seen by an observer, caused by the motion of the observer. Simply put, it is the apparent shift of an object against the background that is caused by a change in the observer's position.
If the shooter does everything the same, every time the trigger is pulled, then the bullets would reach target at minute differences. Parallax differences in quality reddot scopes used out to 25 or even 50 yds is minimal. Ok, the artical does list the ProPoint as having a horizontal Parallax error of some 2 1/2". Are your flyers horizontal or vertical? 10 oclock? 4 oclock? What I don't like about so many Internet articals is that they don't date their material. He doesn't discuss Collimating Reflex sights at all. Still, read his last paragraph if you're dead set that Parallax is your issue. I've used cheap tube reddots and now have an ATN Ultra Digital that is Parallax free as a Collimating Reflex sight. But the only reason I have it is for a 2moa dot. When I bought it, I was not concerned with Parallax for the ProPoint I was using at the time.
I don't own one, but my next sight will be the UltraDot L/T. It is a reflex sight with a smaller dot than the Ultra Four.
That said, I did a short survey on the Bullseye Listsrv in January. Almost everyone that responded that uses optical sight on their competition gun is using an UntraDot.
Look at
http://www.ultradotwest.com/ultradot_2008_016.htm You might want to ask them what 'Maximum Retical Movement at 100yds' is. Is that Parallax or windage/elevation adjustment? Why is this N/A for the Reflex sight?
I'm no sight expert, but I still have to believe that flyers are not to be blamed on the sight. If I were you, I'd shoot with iron sights for a while to see if your flyers still exist. If you've been shooting gallery rimfire BE this winter, and you've got flyers at 50 feet... Parallax probably isn't the issue. Harsh reality- It's you. Uh, Been There, Done That.
By the way, 91% BE scores puts you here:
High Master . . . . . . . . . . . . . . 97.00 and above
Master . . . . . . . . . . . . . . . . . . . . . 95.00 to 96.99
Expert . . . . . . . . . . . . . . . . . . . . . 90.00 to 94.99
Sharpshooter . . . . . . . . . . . . . . . 85.00 to 89.99
Marksman . . . . . . . . . . . . . . . . . . . Below 85.00
-Steve
P.S. I re-read this and well, I don't mean to be rude, and I'm sorry that my writing may sound a bit this way. If you're only getting the occasional flyer, (your sight isn't broken), then I just don't think it's your sight.