I'm going to go out for my first deer hunt up by Barnesville MN this year. It's in the shotgun zone and I'll be on a tree-line next to a 40 acre field so 50+ yard shots are a possibility. I'll be using an 870 with the cantilevered barrel. I'd like to put a scope on my gun. I already have a Nikon P 223 3-9x40 for my AR. I understand long eye relief is important with a slug gun. Here's the spec on the scope. I'm curious to hear the wisdom of the board. Am I gonna give myself a black eye? 
Specifications for Nikon 3-9x Matte Black P223 Rifle Scope:
Magnification:	3x to 9x
Objective Lens:	40mm
Reticle:	BDC 600
Finish:	Matte Black
Exit Pupil:	3x - 13.3mm; 9x - 4.4mm
Eye Relief:	3.6"
Field of View at 100 yards:	3x - 33.8'; 9x - 11.3'
Tube Diameter:	1"
Length:	12.4"
Weight:	15 oz
Adjustment Click Rate:	1/4 MOA
Max Internal Adjustment:	80 MOA
Parallax:	100 yards
			
		
