I would hate to blame the 300..rather the placement. Don't you agree?
Or any other caliber for that matter. Just goes to show you that no matter what you are useing for a cartridge the first thing is getting it to where it is suppose to be. If you do not do that first and foremost all of the lead in the world ain't going to help you make a clean kill. A .277 bullet in the lungs and heart will kill an elk quickly but a .378 bullet in the gut ain't going to do nothing but cause a lot of work and an animal suffering.
Glad to hear of his and your success.