Shaft wise, I’ve had FMJs bend. It’s unfortunate but it’s just part of owning them. If you ignore that, you’re essentially looking at the same arrow. The difference in my mind is components. You can run 75gr HIT inserts in the FMJs which are tried and true. The outsert system on the Day Six shafts offers a little more room for ensuring things are straight. I may catch some flack on that but hear me out. Neither of these insert systems are a press fit onto or into the shafts, they can’t be or else it would remove all epoxy and you’d never be able to install them successfully. So because there is clearance, say it’s around .0025” inches on the diameter or .0013” per side. (I don’t actually know what the clearances are) The insert system has the ability to not run concentric by a certain degree. If the insert/outsert systems are 1” long then that amount of clearance allows for .15 degrees of wobble. (Not much right?) BUT keep in mind we are putting another 1.5” inches of broadhead out in front of that. So by the time we expand the angle out to the top of the broadhead we can be off by .005” in one direction which gives us .010” of runout at the tip of our head. (Another vote for shorter more compact heads) Now before anyone says that you can spin your hit inserts before they dry and accomplish zero runout, please do it and take a video so we can see. I’ve tried and I always end up gluing my field point into the shaft, and if you attempt to unscrew while wet, then you’re probably undoing all of the work you did by spinning them to begin with. The last issue is that with a hit system the shaft needs to be perfectly square or else your not going to seat heads well on the shaft. An outsert addresses that by how it’s manufactured. Swiss machines SHOULD be able to hold extremely tight tolerances assuming the operator does their part. A shaft that uses an outsert doesn’t care so much about shaft squareness because the sidewalks keep the outsert from canting as much. Will they still do it? Sure you bet, but at least you can spin test while wet and understand what you’re getting into.
Does any of this really matter? Honestly probably not. I’m assuming most MFG have increased clearance than what is in my example, so your run out will be more (really makes you wonder why you buy those .001” shafts) So I bought my day six based on durability, and because they’re new and I wanted to see what the hype was about. Will I shoot them forever? Who knows, I’ve got enough commitment issues as it is. Ask my girlfriend
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