I agree with most of what Alk has posted and it is good information BUT I would add several things to think about.
Hard or soft, a lead bullet must fit. If it fits, hardness makes little to no difference until you are on one end of the spectrum or another.
The right fit and too soft pushed too hard, leading. The right fit and too hard pushed too light, possible leading, powder dependent.
There is no reason to make your own lube, none. I have done it, and been successful with it, but there is no reason to spend the time making your own when there are others out there that will work if your bullet has an adequate grease groove. Most of the Lee standard moulds, in my opinion, don't have an adequate groove. Even the double groove designs don't have enough lube to aid in keeping lead to a minimum. Again, just my opinion.
I used to use a lube of beeswax and a liquid alox,
White Label Lube-Liquid X Lube, because I had 4 quarts left over. It worked but involved too much time to do. Maybe when I am retired, I will take it up again.
If you want the best bullet lube around, at the cheapest prices, go here:
White Label Lube
If you have a heater on your luber/sizer get the Carnuba Red, if not, BAC is the way to go for pistol cartridges. I have never used their 50/50 nor their 2500+ but, I have never had a bad product from them either.
p.s. Not affiliated with White Label Lube at all other than a customer!
p.p.s. Hobby Lobby has sheets of Beeswax too if you want to go that route. It is around $10 for a good sized chunk.
Smith Crazy,
Just to establish my bonafides. I have been casting for over 50 years, have cast and fired several hundred thousand bullets, and have used nearly every commercial lube on the market that are supposed to be super-duper in preventing leading. This included several hard lubes, LBT Blue and Commercial and your White Label. Moly bearing, with graphite, and just about any type imaginable. Absolutely none of them comes close to preventing leading as well as the Saeco formula.
So far as your comment that there is never any reason to make your own lube, this simply is not true. When I obtained the Saeco formula from an old Saeco factory rep. the company had been out of business for quite a few years. This was before Redding began began selling the Saeco Green several years ago. I had no idea how well it would work, but felt it worth the small investment to try it out. I was past amazed at how well it worked after spending quite a bit of money in the previous several years trying to find a lube that was adequate among the many commercial hard and soft lubes that were available. I'll relate a personal experience later. Even if it worked no better than any of the commercially available lubes the cost saving alone would be worth the effort. The price I related, $7.50 a stick, was right from the Redding web site. If I can make 20 sticks of the same lube, for less than the price of 2 sticks of purchased lube that would be more than sufficient reason to make it. 20 sticks purchased would cost $150, and I can make that much for less than $10! Don't you think that is a good reason? When I get around to casting I will literally, cast several thousand bullets of various types. I will go through several sticks of lube in finishing these bullets. $25-30 for just the lube is not an expense I care to bear.
I will relate one experience which absolutely convinced me of the efficacy of the Saeco formula. A few years ago I had about 1/2 box of Speer 250 .45 LSWC bullets which I loaded just to get rid of them. They were loaded w/9.0 gr Unique in .45 Colt, and fired in my USFA Rodeo. Just for the heck of it, and knowing these would lead the gun terribly, I proceeded to shoot all 50 rounds without brushing the bore every few cylinders full. When done the leading was even worse than expected. the proverbial "sewer pipe" accurately described the condition of the barrel. You, very literally, could not even tell the barrel was rifled for the lead, from one end to the other. I wasn't in a mood to stop shooting it, just a plinking session shooting shotgun shells, cans, dirt clods, etc. I loaded the gun with the same load, with the difference being the bullets were Lyman 454424, wheelweight + a little tin, and the Saeco lube. I fired 6 rounds, removed the cylinder and examined the barrel, not expecting it to be anything but still badly leaded. Nearly all the lead was gone! There was just a little wash close to the muzzle. A second cylinder load through it and the barrel was completely clear of lead!. All it took to clean it was a patch with Break Free. Would you say lube performance like this is a good reason to make your own lube??????? This isn't something I just made uo, it is a proven formula that has been sold for probably over 70 years.
I have the same experience with .44, .41, and .357 Magnums, as well as all "standard" revolver cartridges. I have used it in rifles chambered for .38-55, .45-70, and .458 Winchester Magnum, with the same results, just wipe with a patch wet with Break Free and then a dry one. At most, with few exceptions, will run a dry bronze brush through the bore and charge holes half a dozen strokes, followed by the wet patch. Often no brushing is needed for leading, but to remove the fouling deposits from the pwoder and primer in the front of the charge holes.
So far as bullet fit is concerned, you are right. A poorly fitting bullet will lead regardless of, or even because of being hard. But, a bullet hardness by itself is never the answer. As I said before, a bullet of 12-15 Brinnell, with a good lube, and fit to the cylinder throats, will do everything that can be done to prevent leading with cast bullets in revolvers. Only semi-automatic pistols and rifles have any need for harder alloys. The only time you will have problems with a revolver is if the cylinder throats are smaller than the barrels groove diameter. If this is the case the gun will lead, no matter what is done, until the throats are corrected. A proper fitting cast bullet will be throat diameter to .002 larger. Don't worry about the bore diameter, that will take care of the bullet sizing for you, that is what the forcing cone is for, to guide the bullet into the bore. Any increase in pressure as a result of an "oversized" bullet is insignificant, and it has been shown in pressure testing that often pressure will be
lower than with a bullet sized to bore diameter. This is, again, in revolvers, and is a result of the dynamics of a revolver, which are entirely different that those of a fixed-chamber firearm.
Tell me if I have left anything out!