Originally Posted by bwinters
Recently bought a Sinclair concentricity gauge. Its been eye-opening. I wondered why my 257 Robts Hornady Superformance still shot so crappy in my bedded Montana. They have runout from 0.000 to 0.010. You can see some of the bullets wobble, and it ain't a little bit.

So, spent some time this AM sorting cases. I'm doing final load work-ups and picked only those cases with 0.0015 or less runout to use. I checked some of my other loaded handloads and they are fairly straight - most at ~ 0.002 or less. I did come across a couple of 0.005-6 which I think explains a few of my flyers I get. I'm hoping any way. Can't tell you how tired I am of shooting great 3-5 shot groups with 2-4 tight and 1 out an inch or so, making a nice 1.5-1.75" group. All this time I thought it was me wink

Anywho - how do you guys straighten loaded ammo? I know Hornady has a system but I'm looking for the redneck ingenuity method.

Thanks.

BTW: my Redding dies turn out some really straight cases. I have a couple of RCBS that do but have a couple that may need some investigation as most of the big handful of cases I measured had necks with up to 0.005 runout. Gonna be pretty hard to get bullet concentric when it starts out 0.005 crooked.........


I played this game years ago when I got into bench rest shooting, but since then let it go. What made me stop was having ammo sorted with run out, shot them out of my bench gun and sh&t didn't make a bit of difference. Gun was grouping in the .1's just like the sorted rounds, from that day forward I stopped doing it. And if that didn't make that much difference in a bench gun I sure it wont make any difference in a factory gun. You guys can flame me on this but I have a lot of custom guns that will shoot bug holes without doing the concentric game. If I can put 10 shots in a group that measures .1 or .2 how much better can it get.