I spoke to a rep at Sierra and told him I wanted to use my AR-15 for deer, he said he had just the thing that he did the testing for. That is the Sierra gameking 65 grain sbt.
http://www.sierrabullets.com/index.c...5&bullettype=0
He went on to tell me it was tested with a Colt AR with good results using H335 powder. I myself have now loaded that round and have a dime size grouping at 100yds. Im not sure who you talked to, but they must not all have the same info.