Ok, I know this topic has come up before but I can't find any threads on it.
I am trying to come up with a good load for my brother's Marlin Guide Gun in 45-70. I have loaded some 405 grain flat point lead boolits (actually weigh 415 gr. out of a Lee mold) and it shoots well. The allow is wheel weight PB dropped in water. Do I need to be concerned about leading in this barrel or not? Am I going to need to change to gas checked boolits? Just looking for insight from other Marlin owners. Thanks and sorry if this has been answered elsewhere. Will