Fabsroman,
The only bullets I use in the 308 are the 168 Hornady BTHP match bullets, due to the scope reticle settings which are pre etched for that bullet weight and design. I have had no problem with the HP design deforming or being inaccurate.
The AR uses the standard AR style ramp (almost no ramp) which could be pretty rough on bullets. I would think that a spire point might work and that the plastic tipped bullets (like the Nosler BT) would do OK.
I have shot Sierra's varmit bullets (87 and 100) and the Hornady Interlock 140 in the 260 without ill effect. You just have to make sure the bullet is well into the case so that it remains aligned after getting banged around by the bolt, ramp, chamber, etc.
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