6mm-223

[eneranch]

Looks like you need to stick with Federal. I was very surprised by the Remington deviation.

I agree about the Federal; here are the groups shot at 100 yds( red dot is 3/4"), #1 is Win (called flyer) #2 is Federal $3 is Remington & #4 is CCI

scan0001.pdf

I wonder if full length resizing might be adding to the velocity spread.

Why do you think FLSing would cause a velocity spread??

a couple other things...

Dies, i run redding, but I use a small base FL sizer to resize first for first neck up. Then I run the FL 6x45 resizer to make sure that they feed when I neck up from 223.

I make sure that all cases are chamfered/reamed with no nics or dings. Same with the primer pockets being cleaned, and flash hole. I do this because it's a bad prairie dog habit with my 250's. Cleaning brass prep is 3 shots (slight chamfer/ream on every one), with crushed walnut, then on the 4th, into the Stainless steel media tumbler to clean the insides.

I can load up a couple rounds with my 75vmax's (8208/BenchMark) and see if they run in your guns using my method if you want. I'll try and dig up my latest target, but it was on a windy day, and I'm really happy with the grouping considering the crappy weather.

That varget load should shoot, i'll duplicate the powder charge, chrono all loads and see what I get for groups or patterns.

The redding die part number is:
MM/223 Rem (6MM x 45) 80312

I use Redding Dies for my 6x45

This brass is brand new, weighed, sized, tumbled (fine corn cob), trimmed, primer pocket uniformed, flash hole deburred, chamfered, then final tumble. Sounds like we have the same method; if I'm doing something wrong, someone let me know.