Ione, there is going to be an optimal method of shooting any bow, based on the tiller of the bow.  However, you can vary from that optimal method quite a bit without noticing any adverse effects other than perhaps an increase in noise.  The extreme would be string walking, where the string hand is placed inches away from the nock point depending on the distance to the target.  String walkers are known to be very accurate shooters, to the point that the method is banned in many traditional archery tournaments.

I'll join saying that shooting 3 under isn't specific to gap shooting or face walking or whatever aiming method one chooses, and adversely split finger isn't specific to instinctive.  

I shoot 3 under, purely instinctive.  I switched because I can feel my anchor better, plain and simple.  It most likely has something to do with how my face is shaped, in my best estimation.  Regardless it works better for me.  

I PERSONALLY don't see the any reason in switching back and forth between the two.  Like McDave pointed out it seems to be a recipe for disaster in a hunting situation.  That, however is just me.  Individuality is a resounding theme in traditional archery.

Jake

Tried 3 under went back to split finger.

I'm slowly going to three under after thirty plus years shooting split.

It all started when I could not shoot a kodiak mag with split fingers. I switched with that bow and now find myself shooting three under with my other bows.

Krex1010- I have very little difficulty putting ONE arrow where I would like it shooting split fingered, instinctively snap shooting.  I like to throw out a can and shoot it with blunt points and stump shoot. I don't know why by my ability to put an arrow where I want it without thinking about the range goes away when I shoot 3 under and can see the arrow more clearly.  I shot my turkey last spring in the base of the neck at 31 yards (purposefully) and my doe at 39 (ranged after the fact)snap shooting split fingered, but the distance was not on my mind.  When hunting I have 2 ranges, in or out of range. Knowing the range exactly seems to hurt my shooting.  I like to think to my self "I'm going to make this shot", not "I'm going to make this X yards shot". However, I have shot some pretty abysmal groups at 20 yards shooting NFAA or Vegas targets when instinctively shooting.  Shooting 3 under, for me, seems to force me to aim, atleast a little bit, and I can't so readily disregard the range of my target, so if all I shot was 20 yard paper targets I think I would score alot better if I shot 3 under while hindering my hunting shot ability.

Thanks David, just bought a bow tillered for 3 under and was told it would have to be retillered but it seems to shoot fine split. Mike

Use both and some hybrids to get my recurves,longbows,NASP Genesis bows to shoot OK.
The bow will tell you.It's up to my P brain to remember which one I'm shooting at the time.
Mike

I've been going back and forth for over 12 years. Here's what I've found. Although I like how quiet my bow shoots when shooting split, I have to admit that I struggle with a consistent anchor point shooting that way. There's no question that I shoot more consistently going 3 under...especially inside 20 yards. I do not like the extra noise when shooting that way but I have come to this conclusion. Since I am a bow hunter first and a 3D shooter second, it is more "ethical" to shoot which ever way gives me the best chance to harvest an animal with an acurrate shot to insure a quick clean kill. What difference would it make if the arrow got there silently but wasn't in the vitals ? Therefore, I will make the commitment to shoot 3 under and do my best to silence the bow as best I can. I owe that to the animals that I pursue !

Both, split most of the time, 3 under on close shots only. Not sure why, tried it and it worked for me.

I traditionally shoot 3 under but I can shoot split as well. It just takes some time to set up the bow. I tend too go through seasons when I shoot better one way than the other.

I started traditional around two years ago shooting split for first year, switched to 3 under (Rick Welch Style) for about 7 months and switched back to split. They both work well for me and I could not say one was more accurate or consistent than the other, but I find split is a quieter release for me.

I'm 3 under. I can't afford enough arrows to try and learn split