I'd forget the Lee Load manual too. I've got one and it's pretty limited in it's listings for 38 spl IMHO. ( 45acp and 9mm too!) I'd go for a more comprehensive manual and /or the online manuals right from Winchester.

Since this is your first time loading I would suggest you load 12 ea with 4.0, 4.3 and 4.6 gr. ( Steer clear of anything near max load for now.)Then go the the range and shoot them groups of 6 on clean targets. Shoot one load at a time, off the bench so you can better gauge accuracy, recoil etc. One of those offerings should stand clear above the rest once you compare them.

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Dave