With a 14" barrel you'll be limited to a little over 2400 ft/sec with a 150gr bullet and AR2208 anyway. I'm not sure that changing either the bullet, powder, or quantity of powder is such a good idea at short notice, borrowed chrony or not. If the load you are using is one you are familiar with in term of accuracy and drop then I'd think that the confidence that brings trumps any likely gains in on-paper effectiveness from tweaking things?
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