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Join Date: Jun 2009
Location: Northern Berks County, PA
I've never run into that with nockturnals. I have used them for a while, and I've also used Luminocks and Fire Nocks, and none have changed POI for me vs non-lit nocks.
I would maybe re-look at tuning and see what's up there. Out of tune can cause goofy things. I had such a "goofy thing" cost me a beauty of a buck last fall. I wound up getting a new bow mid-season because I smacked a limb on the stand and splintered it. While waiting to see what was up with the old bow, I got a new one.
Tuned it for center-shot at the shop, and messed with it in the yard shooting it a bit and shot to 30 and was good to go, or so I thought. I was using Rage Hypodermics, and verified everything to 30 yards.
A buck solidly into the 120" range, I'm very sure, gave me a 33 yard broadside. I let a clean shot go, felt like it was dead on the mark, but it hit about 6" low, hitting him squarely in the brisket. I saw him standing at 50 yards in bino's after the shot and could see the hit. I tracked him about 500 yards before I lost the trail and gave up. I saw him on the last day of rifle season looking fine, so that was good.
Anyway, where this bears on this situation is that I went home after the flubbed shot and took that same arrow I used to shoot the buck and shot it at 33. I didn't move my sight (HHA slider) from how I had it when I shot the deer. I went to where my RF said "33" like it did where I found the hair from the hit on the buck. Put a field point on. Took a shot...boom...right on target. Assumed I just screwed up.
Then I took the actual broadhead I used, cleaned it, folded it up, and shot it on the same arrow at the same distance. 6" low.
Set it up again, went to 30 yards. 3 yards closer. 3. Another shot.... right on the mark. It dropped 6" in that 3 yard difference.
So I broke out my old Muzzy 100gr 3-blade heads. Fixed blade heads. Shot them alongside field points and started the broadhead tuning I SHOULD have done right away on that bow. In about 30 min, I had the Muzzy heads hitting with FP's out to 50 yards. And then the Rages were fine, too.
What needed tuned? My rest needed to be moved about 1/16-1/8" vertically. That little bit of movement made the difference...and had I done it right away like I should have...and knew I should have....that nice buck I screwed up on would now be on my wall and in my freezer.
Moral of the story....changes of POI, look at your tuning first. And don't accept pro-shops saying you're centered and shouldn't move your rest. Also don't do the stubborn thing I see people do where they tune bareshafts through paper, get a bullet hole and say "it's perfect, don't touch it. " Nope. That's your good start, but I then will use bareshaft tuning (shoot bareshafts with fletched, should be able to get them basically grouping together to 20 or 30 yards), and I always finish with broadhead tuning. I find that going paper, then bareshaft, then broadhead (I skip paper if bareshafts are close at 10 yards) is sort of like going to finer grits of sandpaper. Each method strips away issues, and the end result is good arrow flight and no change in POI from fp's to bh's, and I generally verify that past my shooting distances for hunting (I got lazy last fall and shouldn't have).
In fact, to verify there's no issues in arrow flight, I often use my Nockturnals, as any fishtailing or porpoising will be much more easily seen on an arrow with a lit nock than a standard one. I've never seen them make any POI change once my tuning is done, and I've never shot them prior to tuning, so I'm not sure what they do on an untuned bow.
Regardless, that's where I'd be starting if it was my bow.....tuning.