Thanks for the plug on the parallax calc tool George.
Parallax is irrelevant at distance with most optics that we are using because unless you totally suck your misalignment shot to shot is going to be a fraction of the exit pupil diameter.
You will impart more error from inconsistent head pressure and position break down than from misalignment of the optic to eye.
I have shot optics with parallax set @ 100, 200, 250 and 300. No discernible difference to me.
For the SCATT the vortex with 100 yd parallax can be used as us at 10 meters. You can see a relatively good solid Bullseye. A rear cap with hole helps immensely to force alignment because at 10 meters parallax is like 5 moa each way from center! I actually use the vortex as is to work on standing repeatability.
With the NF I need a front cap. I started with an 1/8th inch hole and opened up incrementally until I could get enough light through the scope to see. Ideally something equal to or slightly larger than the exit pupil diameter is a good starting point. I think I am at like 5/32 or 7/32 or something. It is a balance between light transmission and maintaining as crisp a Bullseye as possible. I use a flood light pointed at my SCATT target to help. I use a rear clear lense with hole for head alignment. More to help repeatable head position than anything else. I say it works pretty well
I agree 100% with the 3 of your statements above that I bolded and underlined.
I haven't done any dryfiring in my basement since going to scope in 2016 but I plan to start soon as our season up her in NH starts late April.
I'm glad to see the Vortex PST's will give a good sight picture at close / basement distance. I can get about a 40 foot straight shot across my basement.
George
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