If you were using older lubes, sometimes even stuff like the old standard 50/50 Alox/Beeswax, then sometimes you did need more. The older lubes that were home made conglomerations of waterpump grease, hard oils and waxes just aren't even close to the better lubes we have today. So many older designs, like the Loverins, carried a lot more grooves because the lube wasn't that great. Plus, we've come a long, long way on figuring out that it's not just lube that stops leading! Once again- it's FIT!!! Older undersized (skinny) bullets trying to be pushed at speeds/pressures approaching jacketed loads were ripe to lead a barrel. But a bullet that fits well simply isn't going to need massive amounts of lube as was thought to be needed in 1930. As Jon mentioned, many people using Loverin designs only fill one or two of those small grooves and find they way better accuracy that way and still no leading issues. There is also the theory that lube doesn't actually "lubricate" anything, but that it helps seal the bore/bullet interface to prevent gas erosion which does create leading.
I don't know that Lees Mule Snot (Liquid Alox) is a great lube to depend on if you want to get past the 15-1600 fps. It CAN work, I know that first hand. But it might not be the best choice. There are some vendors out there, some were members here or at the other site, that have liquid lubes that are reported to be several levels better than the Lee stuff. I'm sure some of the other guys recall the names of those vendors, but they escape me at the moment.
And if you are going to try a plain base design over 1500 fps, man, that's getting into masters level territory cast shooting. It's doable, but it ain't easy if you're just starting out. PB in a rifle for me ends in the 12-1350 area for most stuff. A GC makes things exponentially easier as you increase pressure.
