Wow...
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I have stock and (a single) Giesselle triggers. The Gisselle in an LR in 6.5CM. All the others have stock GI triggers, with maybe a little help from a Powers II trigger jig. The CM is set up for longish range work. The others...not so much, maybe 50-200 (one's a 9mm).
It's good to learn to use a stock trigger (even the odd ball three round burst one), as you learn how to shoot
in spite of the stock trigger. That being said, it takes a lot of practice (not necessarily ammo) to become comfortable with it. Cue the long groan of...wait for it...wait for it....dry fire practice (ugh). While boring, it does teach you to use the stock trigger without burning through a lot of ammo for practice.
That being said, if you're not going out to compete in MSR competition, IMHO just get an after market trigger. As someone who has taught the aforementioned marksmanship classes, I can say the regimented, repetitive drills, dry fire and snap in practice really does teach you to be a better shooter. However, most folks don't have the time, inclination or desire to do so (which is not necessarily a bad thing), and will never
NEED to know how to work with a stock trigger. Build what you want, and run with what you brung...
Both sides to this (someone would say pointless) debate; neither right nor wrong, just different.
OP, have fun with whatever you decide to do, and as LoneWolf likes to say "Just get out and shoot!".