The RCBS lubrimatic is worth more then the kit and kaboodle...so it is a good deal. I wouldn't hesitate. Saecol makes quality stuff...no matter what the bullet mold ~ if it's in good shape and has a set of handles ~ it's worth starting with. Your going to need a top punch and lubrisizer die for that .38 bullet. I would say there's a chance that they might be with the rest of the stuff. If that is so...then you are really getting one hell of a deal, IMHO...
You'd be getting everything you need to get started, except a few basic hand tools...
Might last longer than a summer. I've been pouring hot metal since the mid 60's. Started out with a tuna can and a spoon with a Lyman tool with the mold on the end of a reloader. Thankfully, things are a little easier now.
There's a SAECO lead furnace pictured on the cover of this NRA publication on casting:
Redding bought out SAECO in the 1990s and drropped the furnace from their line of products for some reason. I've used one before and prefer it to the Lyman and Lee furnaces. IMO, it was the best one available until RCBS came out with their Pro Melt.
I believe that the name is an anagram for Santa Anita (?)Engineering Co.
I'm thinking you will like that 358477. I've been using one for several years and it is still my favorite general purpose bullet for 38 and 357. I use 1 to 16 tin to lead usually. This is hard enough for the moderate loads I use. Your wheel weight metal will work fine as is for light to moderate loads, but a small amount of tin may make it pour a little easier. Hopefully, your sizing die will be 358 or 359, that usually works out well.
It sounds like you are off and running, best of luck. Ken
Here is a photo of one of my 358477 bullets. This is Lyman/Ideal's clone of the SWC bullet that Rem-UMC & Western C.C. developed for their .357 Magnum cartridges. They shortened the nose of Elmer Keith's 358429 so that the .357 case could be crimped in the proper groove and still have the cartridge fit in the chamber of a pre-M-27 .357 Magnum revolver.
Mine weighs ~152gr. when cast of wheelweights and has the rounded cut for the lube groove. I understand that later versions of this bullet have a squared-off cut for the lube groove - like E.K. requested. I hope yours is the newer version. This is an OK bullet - just not inherently as accurate as 358429 at long range.