[LineCutter]

Not exactly... dry firing is akin to blank boss shooting in that you practice your sight picture & hold without a target to annoy you. The purpose I failed to convey is that it allows you to examine the post triggering behaviour of the gun. I suspect you're right, we have no closer analogue than blind shooting available to us - unless we can borrow the high speed video camera.

We shoot with little/no grip of the bow to hold it still for the follow through, which makes ironing out of the twitches difficult as they are hard to see, either from inside or from the coaches POV. YMMV, of course.

I should add a warning here though - shooting with iron sights is about focus on the front sight & not the target. This proves to be poisonous to my shooting (indoors at least) - I'm much more accuarte looking at the target & letting the sight sort itself.

Just had a thought - could somebody inventive come up with a randomiser for a compound D-loop? Something that would either loose the arrow, as normal, or transfer the weight to the wrist/elbow of the shooter when the release aid is triggered? Then we could study the effect of apprehension on the shot.
Needs more refinement, but the principle is viable (I think). Kind of like the practice loose you can get with a Formaster & a recurve.

Hmm, would need to have the tension on the release aid preserved if possible... maybe this would need to be a coaches only tool.

Thoughts Geoff?