I come from an time where we zeroed our sights at 50 yards and we usually did it from a bench, resting on a bag, or from the roll-over prone. The point was to test the gun/ammo combination, not the shooter's ability to hold the gun
Using this method, anything over 4" was unacceptable and an accurate gun would usually do half of that.
A while back, a good friend of mine placed five 9mm bullets into 1.1" out of a SIG X-5 with a fitted Bar-Sto barrel
If you cover the target with your front sight blade, your aiming area (error zone) is the whole area behind the blade.
By bisecting the target, you've immediately cut that area in half
"Dump" is a relative word. I'd consider it above average if you were shooting as quickly as your sights returned onto target...so .20-.25 splits? It looks like you were tightening your grip during the string of fire or you were peeking at your target
A better test would be to shoot at a series of 1" circles or squares and only take one shot at each, then compare the relative shot placement between POA
Using this method, anything over 4" was unacceptable and an accurate gun would usually do half of that.
A while back, a good friend of mine placed five 9mm bullets into 1.1" out of a SIG X-5 with a fitted Bar-Sto barrel
I never considered the variance provided by the fact that I use the front sight tip dot but maybe that would explain why I'm unable to group as well as others? I consider the shooting displayed above as "average"...you tell me.
By bisecting the target, you've immediately cut that area in half
here's my first range report where I dumped a 15-round magazine at 12 yards.
A better test would be to shoot at a series of 1" circles or squares and only take one shot at each, then compare the relative shot placement between POA

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