So 'Muir', Alan, you both seat your projectiles at the depths as suggested in the reloading information as given by the powder manufacturer(s), with this C.O.A.L. measurement being immaterial and totally independent of the distance to lands within ANY rifle for that particular caliber.Yes, I do too-ish* partly thanks to you, but being a Doubting Thomas I still did some experiments to check!
Manufacturer's OAL would be just as useful to know as any other seating depth/jump to the lands when comparing everyone's results. Especially as we are in a thread discussing it.
* Barnes specify COAL as 2.735" for 110gr and 130gr TTSX .308W but that takes the case mouth at 2.005" just into the cannelure. So I seat them to 2.750" so that the case mouth remains on the parallel shank and then use a Lee Factory crimp. There being no more case mouth support beyond 2.750". The part overhang into the cannelure and crimp combination I reckoned might introduce a variable by either pushing the bullet in further or the crimp may be more difficult to keep constant...
You effectively ignore what 'anal' reloader fellas like myself call "freebore" so that whatever the distance from bolt-face to lands might be in your particular rifles your seating depths are independent of said measurements??
ATB ...... and shoot safely.
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