I don't know about the AR-10, but I load for my M14 and I know for that rifle it's important to stick with faster powders, nothing slower than IMR-4064. IMR-4895 and H4895 are very popular powders for this round and give great accuracy.
Some folks will suggest using a 'small base' reloading die, for easier chambering in your autoloader, but I would not do that. It probably has a fairly loose chamber, and you'll just wear out your brass faster if you resize it too much. You may want to consider using an RCBS X-die, which reduces the need to trim your cases and makes them last longer. Regardless of how you size your cases, you'll want to check for incipient case head separation each time you resize them. Use a straightened paper clip with a 90 degree bend at the end to feel the inside of the case head. If the case head is about to separate you'll feel a definite groove inside the case.
My favorite bullet for my M14 is the Nosler Custom Competition HPBT in 168 grain. They're similar to the Sierra MatchKing, but usually cheaper, and IMO just as good.
I don't know about your AR-10, but many military rifles have floating firing pins and can fire out of battery if a too-sensitive primer is used. For this reason, Winchester and CCI primers are preferred over Federal and Remington.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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