Can't tell you "worth it", that's up to you. I use 2.875" as a practical OAL in my Magpuls. I know that the mag can take longer cartridges, but if you are setting OAL off the ogive and not Max OAL; you can sometimes have some bullets seated long enough to hang-up.
All of my Creedmoor's have factory chambers and while close, can't stuff most 140 class bullets into the lands at that OAL.
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