New to the site, but I'll jump in with a question that's probably been covered before. I searched around a little and didn't find what I needed, so here's the deal. I've loaded lots of pistol ammo, but new to casting bullets and loading for 45-70 rifle. I have an Ideal brand 405 grain mold (457-193), which throws 418 grain bullets with wheel weight lead. My question is: do I need to account for the extra 13 grain bullet weight, i.e. 420 grain bullet when selecting my desired load from the loading manual tables, or is it within an acceptable range? I've looked for load data for a 420 grain bullet using IMR 4198 but haven't found anything I'm real sure with. Not interested in hot loads at this point, but something on the lower pressure side. Any assistance would be appreciated.