Pretty stupid question, but would an airgun shooting .22 pellets like this $350 Sig MXC Pellet gun be a great option for dry fire training for 3-gun? Is that different than what OP is asking for? I ask because the 22lr gun OP refers to might be similar but more expensive, and I don't know anything about airguns but if this could work it would be a great option and I'd pick one of these up to.
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Back in the 1990's, I owned a break-open "Biathlon Trainer" .177 air rifle, with adjustable peep sights. I took it camping, and used it down in my Bud's basement. The rifle you show would be orders of magnitude better.
I own and practiced with an ancient used Savage MKII and a Ruger 10/22. As important was/is the ten magazines I own for each.
The MKII taught many youngsters the basics of marksmanship, with six of them earning NRA Rimfire Distinguished Expert.
It very effectively educated me in how to use the various gyrations my body went though in the offhand position. Even though it had an atrocious (and slowly, continuously degrading) trigger, it helped my pick up the lost points in my N/M High Power Offhand stage.
It was very much worth the effort to work with, and much of that muscle memory is still with me today.
At various times, training strategies like the Parris Island Snap-In, endless repetition of sitting position shooting with the 10/22, and those offhand Air Rifle experiences brought my competitive edge up into the competitive pack of the other N/M shooters. Marksmen are
NOT born, they are trained, and it takes
a LOT of training.
When your trigger really sucks and you've been out there for a couple of hours just single-shooting away, concepts like The Wobble Zone become an ally, rather than a foe.
There ain't no free lunch and there ain't n such thing as too much practice. Just about when you say to yourself "I'm whipped here", and you then step up for another round of practice anyway; that's when the real, lasting improvement starts.
Just do it.
Greg