- Dec 29, 2013
Like you, F-Class John tested it all and from all the videos I watch him do......I can see him being very ocd in a way and you have the same outcome as he did with runout and no longer makes a big deal of it.....I don’t use my Sinclair mandrel anymore like I did, I bought a Kenny Porter die that takes hardened tool steel precision gage pins, those pins don’t wear out like SS and carbide is $$ if you can find them.Run-out on your loaded cartridges is one of the things that effect accuacy the least. If you keep it .003 or less you are good. .001 doesn't shoot any better. Powder charge and seating depth and neck tension are all vastly more important. I have experimented with clocking my cartridges and shooting at 1000 yards and don't do that anymore either. I have purposely bent the bullet in the neck and tested groups and up to about .015 run-out couldn't tell a difference at 100 yards. I did some .050 run-out and my groups did open up to about 1/2 in. This gun I did the test in shoots 1s and 2s consistently. .015 run-out still shot in the 2s. Do the test yourself and you won't worry about run-out anymore. To get the run-out big I bent them in the Hornady run-out guage.
Another thing that could induce runout on a loaded round is the dreaded donut . You wanna talk about going down a rabbit hole.....runout is where it starts and the rabbit hole gets to be deeper and deeper, more and more expensive.