There’s no real optimum barrel length. Optimal length is contingent on factors set forth by shooter & loading conditions. Weight savings plays into it for some. Also, for those wanting to use muzzle Brake or Suppressor, the added length can get unwieldy at some point. 26” just happens to be a popular choice. Last fall I installed a new Criterion MTU profile chambered in 260AI. I choose 28”. I do not use a muzzle or Suppressor. This was replacing my Savage Varmint 26” Barrel in standard 260 Rem. Go with what you feel is right.
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