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Ok, to be more specific from the manual and to provide more information. The test firearm in the Hornady manual is a Winchester 70, 22", 1 in 12" twist barrel. Hornady/Frontier case and Federal 210 primer. Max C.O.L. is 2.810". Max case length 2.015". Case trim length 2.005". That is the test media listed for the 308 Winchester.
Bullet weight of 150-155 grains, sectional density 0.226-0.233. The C.O.L. is 2.735" for the BTSP, B.C. is 0.349
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Which mean very little to the handloader. Manuals are only guides and not recipes. There are two basic rules of thumb for COL. One, is to seat at least 1 bullet diameter into the case and two, is to know were the lands are on your particular firearm. Knowing were the lands are will allow you to keep unwanted pressure down by inadvertently jamming the bullet into the lands. Other than these two and maybe mag length, load em as long or short as you like. Just remember to start low and work up.