Guys, I never thought I'd start so much conversation. Just proof in the comments from some of you earlier about how much fun I'll have as a member (just lazy so far about signing up).
On the topic of regulation, one thing I noted was comments that the barrels should be set for the shot to cross streams at say 50 yards. if that's the case, then given that the centerlines on the muzzles of the 12 gage are about 1.25 inch (I admit that's eyeball accuracy but, as my father always says, it's close enough for the girls we go with) and if my math is right, then for the centerlines to meet at 50 yards, they'd only be canted in 0.025 deg towards each other. Seems hard to believe such accuracy in manufacture could have been attained in pre CNC machined days. And, I'm not sure how much it would have helped. Given that at 50 yards the pattern is many inches, if my two streams were exactly parallel, they'd still have probably 90% or better overlap.
Looking at the issue of the bead height above the barrel and how moving it back would affect elevation, it's tough to say. One would have to know what the original intent of the the set up was - e.g. was the bead set so that a line from the top to the back of the rib would precisely parallel the bore centerline, or was it slightly below so that sighting would place the bore extended center line above the aim point to compensate for drop at some point. I suspect the latter since assuming muzzle velocity of 1000 fps, drop would be about 5 or 6 inches at 50 yards.
Again, back to some trig, setting up the aim line to be 6 inches below the bore centerline at 50 yards requires about 0.2 deg difference between the two. That 0.2 deg difference would mean the top of the bead would have to be about 0.105 inch lower than the rear sighting point of the rib. Moving in 2 inches closer means it would have to be 0.098 inches lower than the rear sight point instead, or about 0.007" difference. Doesn't sound like much, but it is about a 7% change which, if the original sighting was to compensate for 6 inches of drop, this would change the point of impact by around 0.5". For the Sunday trap shooter or farmer out hunting, probably no big deal. But for the top end competitors, maybe one fewer hits out of 400. That could be important.
All that said, I think it takes means two things. First, as someone else said, take it out and shoot it to see if it's on target or not (though as I noted, I don't intended shooting the gun). Second it means after reading this some of you will be advising me to reconsider joining.
|
Hybrid Mode