I just picked up a Smith & Wesson 642 with a Crimson Trace laser grip. I was wondering how to set it up. I have it set parallel to the bore. That way I know it will impact about 1/2 inch left and 1 inch above the little red dot.
I zeroed my wife's 637 at 25 yds...the dot and the impact point coincide there. At all real handgun distances, that suffices, since trajectory over any thing short of 50 yds is negligable. From the muzzle to just about 50 yds, they hit within an inch of the dot, and are actually more accurate than the sights on her 1-7/8" barreled model. HTH's Rodfac
An easy trick to have the round strike where the dot is at is to use a bore sight dummy bullet and the Crimson Trace at the same time. It saves a lot of shooting and fiddling with the tiny allen wrenches. It is cool to see the two dots match up at 15 to 25 yards. You will still want to fire a few rounds to verify the bullet strikes where the Crimson Trace dot is at.
I zero mine at +/-10 yards, since the laser is for SD and I consider that maximum plausible SD range. I start by getting the laser fairly close to the red dot in the house, aiming down a hallway (that gives me about 7 yrds) Then fine tune at the indoor range.
i set mine for 7-10yrds, and have it so the dot is just behind the front sight post. __([])__ the "()" being the laser dot and the "[]" being my sight post to where i cant see the actuall dot if i stare down the sights correctly. i've noticed that its only off a few inches from point of impact out to 25yrds(the laser is high and left, the farther out i go). i figured if i sight off my front sight, thats where i want the laser to be, for when i cant use/see the sights. and in case of my colt new agent the dot is just above the trench [_o_] where a sight would normally be the "[___]" being the trench and the "o" being the laser dot
[stole this picture off the net, since im at work]
When I had a CT on a 442, I set it up like the OP did. No parallax adjustment, so reasonably close at any distance where I could see the dot. I knew the round would be slightly left of the dot, and most likely just slightly above.
I set mine as recommended by CT for both my 642 & M&P9c, and that is to adjust the dot so that POA=POI @10-15 yards. I don't even worry about the iron sights when adjusting the dot. My 642 CT is 6 years old, my M&P is 4 years old and I have never had to re-zero them since the first time I set them. I can take the head off a rattler at 20 feet....good enough for me. Some people make it a complicated process....just keep it simple, that's the way they were intended.
I had the opportuinity to trade my used New Agent for a brand new Colt Commander. In retrospect I wish I had just bought the Commander and kept the agent also! That gun just ran and ran and ran.
On a CCW, I zero the CT laser dead on at 15 yards. So I know that within 15 yards, the bullet should hit within an inch of the red dot. Without a rest, I couldn't shoot one of my CCW guns any better than that, anyway. Further than 15 yards, I would switch over to the sights since the bullet diverges rather rapidly from the laser beam after the zero point. However, I doubt that I would engage anybody beyond almost point blank.