Thinking of getting a laser boresight for a handgun, am I being an optimist?

[JLStorm]

I am thinking about getting an internal bore sight like the aimshot or similar that goes inside the chamber like a round of ammo. My reasoning is that this will allow me to practice sight alignement at different distances in my various hotel rooms in between range time (I generally stay in larger hotel rooms and have at least 10 - 15 yards of room).

Another major plus of the boresight is that it will also allow me to line up my laser sight on my weapon light/laser to the actual Point of impact (or damn close between 7 and 15 yards) when I switch it from one home/hotel defense gun to another without having to go to the range (this is done for one reason or another about every one - two weeks). I recently realized that the laser needs to be adjusted differently for everyon one of the 3 guns I use it on and I dont want to have to go to the range to feel comfortable with the sight alingment of the beam each time I swap it out. I figure it the laser sight lines up with the bore sight it should be pretty damn accurate without have to hit the range to make sure every time I switch the light/laser to a different firearm.

The downside to my issue is that the boresights arent the cheapest things in the world, and if they are not going to work for my purposes I would rather not buy one. My idea seems pretty straight forward, so can one of you let me know if I am being dumb and missing something so I dont go wasting my money?

Thanks

 

[deadin]

I think you are going to find that the Point of Aim/Point of Impact is going to be quite different from where the center of the bore is pointing at the time of firing. Especially on a handgun at short range.

 

[JLStorm]

Somehow I was afraid someone would say something like this, can you explain why this is?

It would seem to me that the laser should point extremely close to the point of impact at short range since gravity and wind resistance havnt changed the bullets path much due to such short range.

 

[deadin]

Two things right off. One is the difference in the line of bore and the line of sight. The line of sight is higher than the line of bore. This gets more pronounced the closer you get to the target. Second, and probably more important, is that upon firing, especially with a handgun, everything starts moving from recoil and the recoil is more in an upward direction. That's because the grip is lower than the bore so everything sort of rotates. The sights have to compensate for this 'flip'.
Boresighting is normally used to just get a newly mounted sight 'in the ballpark' or 'on paper' for the actual sighting in process.
For practice, your idea would probably work, but you would have to 're-tweak' your sights for live ammo.