If you want a new barrel and am willing to go longer...... great.
If your thinking velocity gains between an 18" and 22" is enough to justify a new barrel, not so much especially in a 308 and the rule of thumb 25fps per inch is not reliable and even if it was the difference is not enough to bother.
I like the short barrels my self but consider 24" an optimal balance for handling as well as performance regardless of caliber.
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