06 July 2002, 11:21
MacD37quote:Fischer,
Originally posted by Fischer:
However, I'm just wondering, with all the modern technology, that someone hasn't developed a method using lazers to set up a double. Granted, a lazer is pinpoint, and doesn't take into account bullet trajectory and barrel harmonics, but wouldn't it eliminate a lot of the early going, at the very least? Besides, line of sight is straight, too (though not as pinpoint as a lazer).
Lazers have been used, and they work quite well for a starting point, but the same thing is done at the factories when establishing the starting point, by line of sight, and educated guessing! This is the only value to either system.
Even with the lazer, to get the initial starting
point for the regulation process, one must install "TRY SIGHTS" and with the barrel assembly locked in a vice, and level, the barrels are possitioned so that the try sight is on a POA at the distance for which the regulation is to be done. With the lazer, or the line of sight insert in the chambers, the barrels are adjusted to look at a point that is LOW , and on the LEFT ,for the RIGHT barrel, and vice-versa with the LEFT barrel. Since the barrels are soldered solidly together, the hormonics, is insignificent for the regulation of the barrels for a given load. The recoil,length of the barrels, and weight/ballance of the rifle, all effect the regulation dirrectly! This effect can only be regulated by fireing, and trial and error.
Let's say the first solder is the right one. with this setting the barrels will cross,and be low, by line of sight/lazer, at a point before it gets to the regulation distance, not "AT" the point of regulation. That is determined by the barrel time . This is the time the bullet spends in the barrel before exiting the muzzle. IOW, when the RIGHT barrel is fired, the rifle will rise UP And to the RIGHT . Remember, this right barrel was looking to the left, and low of the POA,by lazer, and the point durring the recoil arch where the bullet leaves the barrel determines it's POE on the target. No lazer, or sighting system can predict this point. Believe me, if it could be done that easily, you can bet the makers would have been useing it for ever. I have built a few double rifles, and the process isn't that hard, when you are regulateing for a given round, of known balistics, and known to be of safe working pressures. IMO, the hard REAL JOB is to find a load that will match the regulation of a rifle that is already built, without blowing it up, or otherwise damage the rifle.
NO, my friend, there is no substitute for the human hand, and mind, where double rifles are concearned!
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[ 07-06-2002, 18:30: Message edited by: MacD37 ]
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