Bullet Casting is almost a hobby and skill set on its own,
yes its closely linked to hand loading without any doubt,
but most people never look at it as anything but a way to reduce cost,
they don,t get into understanding blending alloys and the difference in quenching, and lube formulas
thats a damn shame as there are advantages to cast bullet use and in the correct caliber, weight and design they can perform,
very well on either target or game.
Ive purchased and use at least occasionally, at least 100 plus custom and 40 plus commercial bullet molds
most from NEI, LYMAN, LEE, a few older RCBS, and HUNTINGTON
many people have had less than stellar or praise worthy results, and give up,
many people not fully realizing,
the casting alloy, casting temp, sized diam and lube being used,
must be compatible with the rifle bore and powder charge to maximize the accuracy,
and the impact velocity and bullet design,also must match the application.
some designs are very versatile,
example the lee 310 grain 44 caliber provides excellent results in my 44 mag revolvers and marlin 44 carbine and a buddies 444 marlin
https://www.midwayusa.com/product/51...nose-gas-check
the NEI 175 grain works well in both of my S&W revolvers and my brother-in-laws marlin carbine.

http://www.neihandtools.com/catalog/index.html

theres also the advantage in some cases of allowing the use of a more powerful rifle ,
at reduced velocity and reduced recoil levels
I have a couple friends that have purchased and use 458 win and 416 rem rifles,
that are regularly used for deer and hog hunts
pushing bullets of significantly lighter weight at reduced velocity... yet ..
they still provide a devastating punch at the 50-150 yard ranges they get used at.

this NEI mold get a rather regular use.(45/70, 450 marlin,458 win)
rarely pushed to over 1900 fps