The bullet is brief more than enough to permit for just a COL (cartridge Over-all size) that doesn’t compromise case capacity, and using a powder like IMR4064 — with its extended grain structure — is no problem. Warning: You'll find zillions of loads to the .308 Win. from questionable sources https://andersonhaueo.dbblog.net/12008890/the-ultimate-guide-to-best-308-bullets-for-reloading