I've got a 16" contender barrel in 45-70. I bought some 405 grain cast bullets and they shoot ok but they were 40 cents a piece. I will only shoot 100 rds a year or so, would a lee mold hold up for this amount of shooting? 95 rds would be at paper and hopefully 5 or less at whitetails, should I stick with a 405 grain or try a lighter bullet? My other molds are rcbs pistol molds and I like them but don't want to spend $70 for a 100 bullets are year.