As for those that say a .325 is better than 3/8 low profile... I have switched my 026 saws (50cc Stihl) to run with large format Picco (low profile) bars and PS loops, and they absolutely SCREAM with that setup compared to either .325 or 3/8 standard B&C.
.325 has nearly the same kerf as 3/8 std and so the cutting amount is the same. I made many comparison tests with those two setups on my 026 saw fleet, and there was narry any difference in timed cuts. So I flipped all my 026 saws at that time to run 3/8 std B&C as I had a lot of larger Stihl saws already running 3/8 std 0.050 B&C. Then I got a large mount Picco Stihl bar and ran with with PS chain, and I never looked back. Those are now my second favorite saws after my 361s now. They cut a lot faster with the narrower kerf. Less work, faster cuts. I sold off all my .325 B&C and now I run 3/8 std B&C 0.050 on my 60cc+ Stihl saws, and Picco on all the 5occ and smaller ones.