joe soapy Posted May 28, 2016 Report Share Posted May 28, 2016 Wondering what the minimum diameter for a tunnel would be, maybe 100 meters long Link to comment Share on other sites More sharing options...
justin credible Posted May 28, 2016 Report Share Posted May 28, 2016 The minimum diameter depends on whether you want to crawl down it or walk down it. Link to comment Share on other sites More sharing options...
Big Al Posted May 28, 2016 Report Share Posted May 28, 2016 Wondering what the minimum diameter for a tunnel would be, maybe 100 meters long Are you talking about a commercial tunnel or just something your thinking of knocking up for your own use? Link to comment Share on other sites More sharing options...
MrCetrizine Posted May 28, 2016 Report Share Posted May 28, 2016 It depends on the calibre being fired. One of my clubs has a 100m that's 1.5m diameter and it happily accommodates everything from FAC air to .50 BMG. If you were only firing fast moving rounds with very little drop then you could go smaller but you get a ground effect style deflection if the bullet goes near the edge. Link to comment Share on other sites More sharing options...
joe soapy Posted May 29, 2016 Author Report Share Posted May 29, 2016 Are you talking about a commercial tunnel or just something your thinking of knocking up for your own use? was just thinking 12 inch drain pipe dug into a trench outside the back door Link to comment Share on other sites More sharing options...
finnbear270 Posted May 29, 2016 Report Share Posted May 29, 2016 The minimum diameter depends on whether you want to crawl down it or walk down it. Or you could build a hut at the catcher end, one range I have been to has exactly this set up, the tube is around two feet in dia. Link to comment Share on other sites More sharing options...
finnbear270 Posted May 29, 2016 Report Share Posted May 29, 2016 Link to comment Share on other sites More sharing options...
gbal Posted May 29, 2016 Report Share Posted May 29, 2016 Well why not-though windless days are an option. But ask too,how will you feel if the tunnel groups are over 1/2 moa...or more? :-) gbal Link to comment Share on other sites More sharing options...
Simon J Posted May 29, 2016 Report Share Posted May 29, 2016 I've used a range where end to end containers are used. Very functional. Owner uses a bike to change targets! Link to comment Share on other sites More sharing options...
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