I would shoot at least 1 shot to verify the zero. You can use light target loads then switch to the high priced Turkey ammo for hunting.

Interesting Tip, will give that a shot

That one works, also towards dusk or dawn while it's still dark out, UNLOAD YOUR GUN AND MAKE SURE IT IS UNLOADED, then take a Mini Mag Lite and insert it in the muzzle end of the barrel (usually will fit the 12GA without problems but you may have to swap out the choke for a IC, focus the light into a real tight spotlight, and place it on a target or object and adjust the scope to get the cross hairs on the center of the spot of light. Done that a couple times turkey hunting, swapped the chokes out, spotted it, then put the choke back in. Never lost a bird through the scope. Just remember to remove the mini mag light before loading the gun.

that's an interesting approach. I recently mounted a saddle mount (b.square) on my Browning BPS to shoot slugs for deer. After a few shop modifications to the mount, i took it to the range. First i shot 2 slugs at a pizzabox target at 20 yds, made windage and height adjustments. Shot two more at that range to verify the changes (about a 2 inch group). I then put it on the sandbags at about 60 yds and shot A four shot 3 inch group. Not bad for a smoothbore shooting cheap Rem. Sluggers. Start to finish i had an hour and a half into it. Unfortunately i only took one shot during the 6day season, at a coyote i did not recover. That however was probably due to a hasty offhand shot at a moving target where the swamp made my search difficult. Point of this story, if there is one, is that i had a relatively easy time mounting this scope and zeroing it w/o boresighting. Was i just lucky?

Thanks for the tip. I'll try it this fall.

Worked great. Had my 870 totally stripped down. Put it back together and sighted the scope using the above listed technique. Half an inch low at 50 yards! Not bad.