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Dismas316
Out of curiosity is the inconsistency due to working outside your true working speed? Have you put it to a timer on the same drills and not just at a match to reduce outside variables? For example what I have noticed for me when I put a similar smaller gun up against its' larger brethren and run the same drills on a timer I naturally speed up and start working outside of my working speed where I can obtain that 90% or better accuracy. I do not know if this is a mental thing, i.e. I have more grip to work with so I start trying to run faster splits, if it's the increased sight radius, the reduced muzzle flip, feeling of better recoil control, the increased radius making me think I'm within the acceptable window on my sight picture when I am actually not or what.
I wish I could specifically say what it is for me that effects me this way because then I could work it out but I can't. The big takeaway for me when working between larger and smaller guns of the same platform is that I have slow down and work at consistent speed to maintain the required level of accuracy. If I do so then I can pretty much be on par for my norm in accuracy and split times. It's the ragged edge of my skill set where things fall apart. The only real factor and instance I can quantify the issue is when I go from a 19, 17, 34 to a G43 or something like that. Then sight radius and grip length is a factor along with ride height and the angle the gun sits when I approach my draw. This greatly effects my draw and first rounds to target as well as recoil mitigation during multiple shot strings because there is no time to readjust my grip and a smaller gun is much less forgiving in this respect.
Readers digest, I think the natural inclination with a small gun is to slow down, larger gun, (grip length) the tendency is to speed up. I'd recommend if you haven't already to put it to a timer across a varied set of drills, (if possible I would use drills you have a large basis of data on your performance with).