Re: Reloading for the AR10
Kevin is right. Zediker. Guess I should've trekked to my bookshelf and verified the spelling... oh well.
But, there is all you could want on handloading in the Competitive AR volumes. Read them first and learn what factors combine to make the AR-10 work best. The handload is not the most critical aspect for AR-10 accuracy. Sierra advises 42 grains of RL15 as an accuracy load for the .308win with 168gr matchking. Probably start .5gr light and look for ejector and extractor marks on your cases. Might evaluate your recoil spring and buffer as well. The diameter of your barrels gas port can also be influential. All these factors come into play.
One thing does suck about Glen Z's writing is his homeboy Jerry Clower euphemisms. Glen lives in MS and likes to be sure you know it. Being your own publisher must have merits, but next book Glen, just give us some relief!
There is a whole lot more involved with the AR-10 than the 15 as far as getting precision results. I have built several match quality Armalite AR-10 uppers. Most critical aspect of the upper is short oal headspace if you're going to shoot factory ammunition. Need to also know what ammunition the manufacturer endorses. In a 10T it will be 168gr BTHP match ammo. If so, that is the bullet you want to use, unless you have a smith you have great confidence in and trust to re-throat your chamber for 175, 180/185 grain bullets.
Not many semi-auto guys on this board. Not many would claim the .308 as a longrange rifle. Not that you can't shoot it to 1000yds, but there are better choices. Might want to look for load info with the M1a Service Rifle shooters as a starting point. Sierra used to have a section on semi-auto match rifle loads; not in the newest manual. Another thing to be aware of is that you must choose a primer that will withstand the firing pin indent and be aware of slam-fire potential... Anyway, a well built 10 is capable of great precision, until you understand the overall picture, you won't get all you could be getting.