i have a 12ga. H&R with a rifled barrel. i had it bore-sighted also. my question is... i want to sight in at 100 yds. should i start at 50 yds then go to a 100. or seeing how its boresighted can i just sight in at 100? sorry im not a gun hunter i always use a bow, i have guns but nothing with a scope on it until now. thanks