Being a novice with casting I have a question. I will be casting my first batch of bullets soon. I have two friends with size lubers that will help me with the lubing the new bullets.

So this is the question, one size luber is a Lyman and the other is an RCBS. I need to buy the die for my bullet size. Are these dies interchangeable just like the dies used in the reloading presses?

Thanks

Yes.

The only difference is in how the two manufacturers position the lube holes in the dies, which is purely academic.

yep any H&I style sizer will work, make sure you get one about .001 larger than your bore dia.