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Bart B. · July 8, 2013, 08:02 AM

Machine rests have been used by military rifle teams as well as civilians to test their shoulder fired match rifles and ammo for the accuracy it produces. It's the only way to remove the human variable. The best of such rifles and ammo shoot about 1/2 MOA at 600 yards so tested. Slung up in prone, the top ranked competitors have a good day if they can keep all their shots inside a 2 MOA circle. Records are set when they keep 'em at or less than 1 MOA.

Here's a link to some photos of the machine rest that several bolt gun shooters used testing their stuff. This one was built by David Tubb's Dad, George, back in the early 1960's. 10 to 15 others have been made. His Tubb 2000 tube gun's shown clamped in it. Conventional wood stocked rifles have coned escusheons on each side of the butt stock in front of the butt plate where cross bolts clamp into it. They recoil back and upward just like a shoulder fired rifle does. Movement back for a 13 pound .308 match rifle is a bit over an inch. The 40+ pound top cradle holding the rifle that slides on the 3-point contact base has a maximum return-to-battery error of about 1/20th MOA.

http://www.flickr.com/photos/1278722...7594303093714/

July 8, 2013, 08:02 AM	#95
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	Machine rests have been used by military rifle teams as well as civilians to test their shoulder fired match rifles and ammo for the accuracy it produces. It's the only way to remove the human variable. The best of such rifles and ammo shoot about 1/2 MOA at 600 yards so tested. Slung up in prone, the top ranked competitors have a good day if they can keep all their shots inside a 2 MOA circle. Records are set when they keep 'em at or less than 1 MOA. Here's a link to some photos of the machine rest that several bolt gun shooters used testing their stuff. This one was built by David Tubb's Dad, George, back in the early 1960's. 10 to 15 others have been made. His Tubb 2000 tube gun's shown clamped in it. Conventional wood stocked rifles have coned escusheons on each side of the butt stock in front of the butt plate where cross bolts clamp into it. They recoil back and upward just like a shoulder fired rifle does. Movement back for a 13 pound .308 match rifle is a bit over an inch. The 40+ pound top cradle holding the rifle that slides on the 3-point contact base has a maximum return-to-battery error of about 1/20th MOA. http://www.flickr.com/photos/1278722...7594303093714/ Last edited by Bart B.; July 8, 2013 at 08:10 AM.