Long before I owned an optical collimator, I did all my zeroing by starting out with boresighting from a sandbag rest. It works just as well as any boresighting device, just a little slower.

However, my advice is to ALWAYS fire the first shot or two at 25 yards, to make sure you' re going to be " on paper" out farther, NO MATTER HOW YOU DO YOUR INITIAL BORE SIGHTING! This can save you " several boxes of slugs" !!

I once met a gunsmith that said he could use a collimator, and " ALWAYS" be within an inch or two of the point of aim @ 100 yards, first shot! I really doubt if this is at all possible, given that every rifle, and every shooter' s eye, is different from every other one! IT IS IMPOSSIBLE FOR SOMEONE ELSE TO SIGHT IN YOUR RIFLE FOR YOU, AND HAVE ANY ASSURANCE AT ALL THAT IT WILL HIT WHERE YOU AIM!! If it does, you' d be very fortunate indeed!!