Personally I would forget the crimp.
I would start at 2.80" with the 175 Sierras or 178 Amax in the 308 and go from there. You might find that 2.80" is best for both....or not. 41.7gr of 4064 with the 175 Sierra Match King is the load used in the M118LR long range load and it is set at 2.80".....Very good load in every 308 I have used it in.
Another Great Load
Savage 10FLP.
Bullet: Sierra 175 gr. HPBT
Powder: Hodgdon Varget 43.0 grs.
Primer: Federal 210M
Case: Lapua
Velocity: 2582
LOAL: 2.805 (2.230 Base to Ogive with Stoney Point)
Comments: Ten shot group measured 0.815.
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