I just loaded a bunch of these as per the Sierra reloading manual. Started at minimum and worked up to just under max and am quite happy.

I used twice fired LC 2008 brass, Remmington 7.5 primers and 26.2 grains of Winchester 748.

Three groups of 10 where fired. 2 where 1.3 MOA and 1 was 1.7 MOA.

The groups where that big because flyers where included.

The thing i like about the 55 grain Game Kings are that i can get my C.O.A.L. within .005

With the 69 grain SMK's i feel lucky to get the C.O.A.L within 10 thousandths.


Does anybody here have any secrets to bullet seating to tighter tolerances?

I use an RCBS rockchucker press and the the regular 223 dies.

Seems i get a good run on the 69 grain bullets and then get a few that are way over and way under, then back to normal again....

I am guessing this is due to the bullet ogive and not the reloading equipment?