Quote Originally Posted by concretus View Post
I have a question; Since the rifle is somewhat shooting decent w/ .264 dia bullets, would the 160gr RN bullets be preferred due to the added surface area, or could I try the 140gr bullets? Also, with the smaller dia bullet; can I use a regular large rifle primer w/ the other type powders; (IMR4064, Varget, H4895, IMR 4350, etc)?
The answer to all three questions is yes.

Be sure to read and understand Dave Emary's comments at SHOOTING THE 6 before experimenting further with the .268" Hornady bullets. Although his experience with H414 differs from yours, the underlying phenomena described may give some insight into your problems.
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