I use win 231 and also use the lee turret, 3.7 grains seems pretty light. Manual I use calls for at least 4.3 grains and the auto disk is labled .40 for loading 4.3 grains, this is for 115gr fmj. Hope this helps.
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Well you are comparing apples to oranges here!
the powder measure ( really any powder measrue) drops in capacity or volume, the manuals are listed in weight (grains) so you need a conversion, that conversion is the VMD mentioned previously.
Understand that any powder will vary from lot number to lot number and none are exactly the same as the previous, but they are very, very close!
additionally different powders have different shapes and density, so you must be able to convert from capacity to weight.
I have never dropped a charge in a Lee disk that was on the money, they are always light.
likely a built in safety feature!
What i generally do is go right to the next up size disk cavity, drop about 5 loads and weigh each one, as long as they are at or slighly below the manuals reccomended weight then I make a note in my reloading journal and then i know what size disk to use for that load in the future.
When beginning to laod a new batch i always weigh the first 2-3 drops to make sure its still the same, then i weigh about every 20th after that.
I NEVER load maximum loads with a powder measure of any brand, i always individually weigh them.
one should never assume that they can just randomly increase disk size without first weighing the charges on a reliable scale.
Thats my way, not te only way, again just MY way of doing things!
Put those disc in your kitchen trash!!! Get the adjustable one. You don't have to take the hopper off and you can adjust charge weight by hand