Look at the labels on your old bullets. Try to match the same BHN hardness you have been happy with. This should avoid a too hard lube. I would skip over anything that says "hard cast". This is a marketing misnomer with no standard that can result in bullets that will not obturate to fill the throats and barrel. It is usually accompanied by a lube that is too hard to fill the grooves as it passes them.
Consider shooting powder coated bullets as an alternative, which can help with a too hard bullet.
Consider shooting powder coated bullets as an alternative, which can help with a too hard bullet.