I have had a lyman Lube Sizer for 26years. Only use it if I can't cast a bullet of the correct diameter. Never used it for anything over .451".
Sizing should be avoided if you can: pan lube for black powder, tumble in liquid alox for smokeless.
fred.

I lube with SPG using a RCBS lube sizer.  I don't use the Lyman sizers, finding most are egg shaped pretty bad.  Tried three, and returned them.
I order a .458 sizer from RCBS, and it is dead on concentric .458.  My bullets measure .4582 to .4583 after sizing and lubing, 20:1 lead, from a .459" Brooks 545 gr. creedmore mold.  Brooks states on his website that he cast his bullets to .459 and resizes them to .458".  I am kind of new at the BPCR silhouette, but what works for a two times National champion, Steve Brooks, should work for me!  
                           Best to all,   Tim Smith-Lyon

I suppose if you tighten the set screw too tight it might egg the die

Mostly pan lube or use a Dell style at the shooting bench. However use a Lyman sizer sometimes.  Wintertime in my shop when it's cold it works better heated. So seldom it's not worth putting a heating device on the sizer.

Get a heat gun, mine's a Craftsman and not very expensive. It only takes a minute or so to warm the sizer up so things flow nice.  The heat gun is also usefull if switching lubes. Hang the sizer upside down and melt all the old lube out.

Boats

Garbage in garbage out. If you buy a good mould from a good aftermarket mould maker you will get a round mould that is a proper size. If you buy from a manufacturer with a one size fits all approach to mould making you will have to jump through all the resizing hoops. Think about it first they sell you a mould that is somewhere in the neighborhood of the size that you need. Then when it doesn't shoot well they want to sell you a resizing contraption to fix the already shoddy work they did when they cranked out a couple of thousand moulds. Spend your money on a good mould that is the right size and round then pan lube them and you will have a lot more time to shoot. Or you could spend your time deforming the bullet with dies in hopes that you can make a silk purse out of the sows ear that fell out of a commercial mould.
40 Rod

40 Rod & Westerner you are connoisseurs of bullet molds.  Lots of guys shoot well with factory molds.  They ain't all bad. Ask Froggy who has a mixed collection and shoots them all.

I do agree something custom is better though.   38/55 have three molds that work, two custom and one out of the box Saeco, it throws a pretty good bullet too.

For monthly offhand matches with about 100 fixed rounds expended and another 100 per month practice, the lube sizer set up right and one of LBT's old custom two cavity's cut for my barrel is the ticket.  It shoots almost as good as breech seated Hoch bullets. Probably 2 moa compared to One & 1/2 moa. Production is way faster allowing more shooting and fishing time.

Boats

I've got about 1/2 a dozen or more Ideal and Lyman moulds in .32 caliber ranging from a couple so old they have integral handles to a variety of the later ones... all single cavity and most small blocks, so they are indeed old.  All the ones I cast with cast as consistently and as round as most of the moulds people brag about.  BTW, Joe... the French bullet (tapered w/spitzer point) was about the third one I got.  Don't use it much any more, but used to love it in my high-wall .32-40.

Froggie