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Fish 307 has the Fin-Bores in stock for a good price.
I concur with ducati. 8" is going to be the one you want then. 8-12" of ice isn't going to be a problem at all. Once you get the hang of it you should be thru that much ice in less than a minute per hole, unless you have a injury or shoulder/arm problem that hampers you. The difference between the 6" and 8" in that thickness of ice isn't going to be that much. Effort to turn the auger isn't going to be much different between the two. The difference will be that it will probably take about an additional 15-25 turns of the auger using the 8" rather than the 6".Doesn't seem like much, but if your popping 10-20 holes at a time it adds up. When drilling with the finbore you use very little down force, just set it on the ice and start spinning, it will pretty much start pulling itself down. Keeping the rpm's up makes it easier once you have a hole started. The only real time that it gets harder and you start feeling resistance is when you are about to punch thru the bottom. If you take care of you blades they will last you many years before needing to be replaced.I typically get at LEAST 4-5 years out of a set. Blade care: 1. NEVER bang the blades straight down (or sideways) on the ice2. watch out for dirty ice (wind blown dirt or sand, branches, rocks or debris frozen in the ice) 3. don't try chipping ice off the blades with metal scooper (etc) 4. don't believe that you can just touch them up to make them sharper (it never works), just replace them. 5. blade guard only comes off when your ready to drill you holes and goes back on when your done, they will cut wide and deep anything that gets close to them.6. don't let someone borrow your auger that doesn't know the above rules 7. spray them down with WD40 (or your preferred oil) at the end of the season to keep the rust off over the summer. IMHO - get the 8" finbore and start popping holes.