Try 300gr HP's in the 45-70, it will shock you what it will do, under 300yrds I all ways grab the 45-70 over the 300WBY. My 45-70 is on a Mauser 98 so I smoke them out there as hard as possible. We have killed several elk with both and in closer there is no comparison, I have hit spooked running elk with both and when the 300grainer hits there feet stop moving and they pile, the 300 WBY takes a few hits less a hit in the CNS. You can push them hard in a Marlin also but the load I use would chunk a Winchester.