My best friend and hunting buddyJust found out yesterday that he has a herniated disk in his back right between the shoulder blades. He shoots a 300win mag and a 30-06 .His doctor also a hunter said not to shoot these as it would do even more damage to his spine,my question is what calibre and recoil level shouldd he shoot now,that won't damage his back.Where we hunt a long shot would be 75 yards.any suggestions would be greatly appreciated.