SmallCaliberCentral

I have never been able to read much about barrel harmonics, although I have been interested. From experience, I have found that some sporter barrels shoot better with a full glass bedding. Others will not shoot that way and need to float except for contact under the chamber.

I would like to hear your opinions of this and if material is available on the net, I would appreciate knowing where.

Lenard

Check out Varmint Al's site, there is a section on barrel harmonics that is very good.

http://www.varmintal.com/amode.htm

He also goes into more detail about adding a tuner to the muzzle end of a barrel.

http://www.varmintal.com/atune.htm

The software analysis is a real help to understanding some of the hard to comprehend things that occur when shooting a rifle.

Check out the rest of Varmint Al's page, if you are fascinated with the physics of shooting (like I am) you will spend many an hour on his sight.

Varmint Al does have some good work on barrel harmonics.

To go with the info you glean from Al try googling "Audette Ladder Test" or "Incremental Load Development"

A slightly different way to develope loads for a particular rifles harmonics. I've used the Audette method exclusively.

I just ran one this Sunday on my new 6ppc. At 25 degrees I found the center of the node at 29.5 gns of N-133. Looking through Dunham Bays Winter BenchRest equipment list I found most shooters were using 29.5 gns of N-133. Go figure.

Thanks guys, that is interesting information and easily understood. Generally I work up 1/2 a grain at a time, but thought that trying different powders/bullets was somewhat cumbersome. It just seems to take a lot of time to eliminate loads/bullets. I like this idea.

Guess I have been fortunate in being able to zone in, though my requirements may not be as stringent as many here. If I can shoot into .300" I am absolutely estatic.

Live and learn.

Lenard