I have been casting for a few years and have a collection of maybe a dozen molds but I am still a very basic caster.
I recently purchased a Lyman Gould mold for my 45-70. The bullets drop at around 456 to 457. I have tried using a hot mold and cooler lead. I have also tried powder coating a couple of times to try and bring the diameter up to 459 but they still come up a bit looser than desired.
Can I please ask, what is the best way/techniques to hone the mold out? Is this even effective?
Thanks in advance