This is a little off topic, but it is about basic lever action accuracy. From what I have read, most lever actions can be surprisingly accurate rifles, if you treat them right. I know that my Marlin 336 will out shoot a lot of fancy rifles at the range I go to, if I understand its limitations.
Specifically, one problem that comes up is that most level actions have a tubular magazine and that can impact accuracy. Speficially, if you fill the magazine with bullets you are effectively hanging weights from the barrel at various distances. You should not assume that a full magazine will have the same POI as a lever action with an empty magazine. Similarly, you are compressing the tube spring with a full magazine. Both the weight and spring will change the way the barrel vibrates and that will impact accuracy.
What that means for most of us is that if you only want to shoot at targets with high accuracy; a lever action should have at most one in the magazine and one in the barrel. Once you have gotten a highly accurate load, then you can see how much and additional round in the magazine will impact your POI (accuracy) and determine what is acceptable from a hunting perspective for you, your skills and likely distance you want to shoot.
The point of this post is that in determining what cast bullet (or any) load shoots best in your rifle, you need to be consistent and not change the amount of ammo you have in your magazine.