Philbert now I think I see the problem. Some how you have time to sort out a bunch of chains that you borrowed from a historic museum to put on display for the rest to wonder about where they came from. And to top it all off they are all clean sized from large to small and back to large. I do have a few 3/8 micro chains which rarely get used, but now and then they cut some thing. Every thing else uses 3/8 semi or 404 semi what do I have to know? I drive up to a pile of logs several thousands ( s ) ( s ) and start up a saw and watch the chips. If the chips are dark brown I know that I just want to use a chain that is aggressive and move them out of the way. If the chips are light colored causing the motor to lug a little then I know I have some keepers. Some days I will have to cut 10 or 15 cords to get a couple of good cords and other days just 3 or 4. During this process big knots and small knots and gravel show up forcing me to get the dreaded file out to reshape the teeth. This process can at the most take 10 minutes on a 30'' bar. After 10 to 20 days of cutting and my ice is getting low I fill up my truck with a load and start driving to the closest taco stand that I know my dog will enjoy. So how in the world would I know or care if the chain is 050 or 063 or 1/2 wide? Actually as we have discussed I rarely look at the chain or teeth as it is the only time during the day that I can watch my dog chase around barking at the bears. Thanks