johnk wrote:There's a lot of discussion, particularly among rimfire benchresters about the interesting eddies that occur in confined spaces & the tendency of loads to shoot away from close hard surfaces. Apparently, the tunnel isn't all that ideal after all.
John, you might find this interesting about testing 22 rimfire ammo in a ballistic lab using a tunnel. http://nielsonbrothersarms.com/22%20Concentricity.htm
Lapua's tunnel testing facility for rimfire ammo. http://www.rifleshootermag.com/2012/04/ ... ce-center/
Leaving the rimfires behind for a moment most of the big bullet manufacturers use tunnels for testing and developing new designs. Even some individuals use tunnels to perfect their loads and reloading techniques. This guy even used them to see if neck turning could provide an accuracy increase! http://bulletin.accurateshooter.com/200 ... ned-necks/
If I had access to a 100m tunnel for testing my loads I would be in seventh heaven! At the moment I would even settle just for some reasonable weather in Adelaide.
ian
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