Dime sized groups are achieved by dedicated practice. Having an
ortho-grip, proper target sights and low bore line which are common
characteristics of the top end match guns just makes the task
easier.
If you Benchrest any of the mid to top end .22 target guns, they will all
shoot one hole at 20/25 yards. It is the 'jerk' behind the trigger.
First, what are your goals or purpose for this target pistol? Plinking or
serious ISSF/NRA bullseye shooting - local, provinical or national level?
Or somewhere in between. What is your budge? I mean gun and annual
ammo cost.
If you practice for serious BE shooting, you will outlay more than the cost
of a new matchgun in less than 1 year. Most matchguns are life time
investments. So consider the length of your planned shooting career and
amortize the capital equipment over that time $2000 over 25 years is
$80 a year! Less than TIM's coffee money.
With target pistols, you do not shoot crap hi-velocity ammo if you want
to get any good. Not only are they not accurate, but they put unnecessary
wear on your precision instrument.
You will soon find that the cost of ammo and mindshare/practice time
are more pressing issues than the cost of owning your projectile
delivery system.
Join a pistol league, most shooters have back up guns which they will
gladly loan you to try. If you take to the sport, then look around the
league to see what people are using.