Fun with a new toy. Have measured every round thing in the house that will fit in the gage, I finally ran some factory loads thru the gage with the following result:

Norma 7.65 Arg: 75 % had less than.003 run out, min to max. 25% had +.003, less than .006, min to max.

Rem .270: 50% had less than .003 run out, 25% had .003-.006, and 25% had +.006.

Fed Premium .270 150 Nosler: 80% was less than .002 and the other 20% ran .002 to .005.

Fed Classic .270 130 Hi-shock: (24rounds)13rounds less than .03; 3 rounds were .003-.005; and the remainder were +.005.

I did not have any factory Winchester rifle cartridges around. Ku-dude

I've measured the runout on Winchester's factory Super-X 130 grain .270 stuff (awesome factory ammo for the .270, by the way), and found it to be in the .002" range...

Thanks for sharing your info.

Dan

YUP--BEEN THERE AND DONE THAT. Everyone is scared to death of some runnout. You'd think the bullets are gonna come out of the barrel sideways if they have more than .003" runnout.

One of the best groups I ever shot was loaded before I got my casemaster. When checked the remaining ammo I found out it had .007".

NOW....I wish I did enough shooting to do this but, since you have some "variable" ammo would you do us a favor and shoot the low runnout ammo against the high runnout and and see if there really is an accuracy difference. I do admit that I sometimes segregate the ammo based on runnout and mark the primer with a sharpie marker. The high runnout gets a black primer, the medium runnout gets no marking, and the low runnout gets a green primer.
I don't think you'll see any difference in that factory ammo at all but, if you have a chance let us know!! thanks kraky

If you do test the high runout against the low runout, it would be a good idea to use "blind bags" so that you won't know until the groups are on paper which bag was which. (Just fold a note stating which is which, and stick it in a zip lock bag with the cartridges. Then mix up the bags and take them to the range).

I think it's worth pointing out again here that runout can have many origins--some more detrimental than others.

Virgin factory cases may not be concentric themselves, which would cause oscillation of the runout gauge. But this type of runout may not necessarily mean that the bullets enter the chamber in an offset manner.

Here's a link to more details on the matter...

http://www.serveroptions.com/ubb/ultimatebb.php?ubb=get_topic;f=6;t=007345#000000

Dan

I'd like to see you "run-out" guys do an experiment. Take 5 of the worst-case run-outs you got and shoot a group; then take 5 of the best in same load and shoot a group. I'm curious to see what the difference would be.

Tried that Reedg just got very frustrating, found my rifle ( 22-250 Sako V ) shot same groups????

Again, you would have to segregate runout types to get any sort of definitive results. Case body induced runout may not make any difference at all. Case neck runout would likely make a noticeable difference--especially with light, fast varmint bullets. But you'd have to have better than a 1/2 MOA rifle to really see it.

Dan