I would think that the cost of 405 gr. bullets for the 45/70 would vary depending on whether they are cast to your specs or not ie: your choice of dia? your choice of alloy? Lubed for smokeless or Black Powder? Machine cast? Bullet design and suitability for your use would be other factors to look for in a G-O-O-D cast bullet. Like jacketed bullets, I would think that price should not be the main factor.