I have made it much easier by settling on one or two bullets in each caliber. Not using 5 different 45-70 bullets has made life better.
I cast what I want, when I want. I don't "keep inventory", I just have bins of bullets. If I look to be running low on something I will cast more but there is little science to,it.
I think mostly us cast more than we shoot because we cast at home but don't shoot at home. Much asker to get to the garage for an hour than to get to the range for an our.