We have a similar saying but it's for Barnes and Accubonds, have literally not tracked an elk since starting to shoot Berger's, well, take that back when my daughter was 8 I had her tracking elk to learn since the Berger blood trails were short and so easy a blind man could follow them its good for a youngster to learn. I'm not recalling even having an elk get out of sight since switching.
Buddy got talked into the bonded bullet coolaid last year, after a dozen on shot kills on one gun the first one they switched bullets on ran for over a mile and had to be shot again with all the same placement.
Personally I've seen more elk wounded because guys think they have an advantage with a bonded or mono bullet and take shots that just don't work at a high percentage, I dang sure was one of these guys till I started shooting elk in open fields and I could have guys use my guns and test stuff, I was horrified the first season and by the end of the second I was ready to give up hunting. IN the mountains every once in a while you'll get a shot that you just don't know what happened, cant find blood, elk run for ever and you just chalk it up to elk fever or pulling it. I've come to believe a higher percentage of those are hits just wrong bullet and placement because of misplaced confidence in a chambering or bullet. If you think a 300 mag with a bonded or mono bullet lets you shoot an elk at any angle and get 100% performance your simply in denial, I've seen more elk shot in the shoulder with 300's and bullets like barnes and accubonds and they did not make it into the chest and the elk will make it for days with a blown shoulder, I've finally worked in on many of them and helped dispatch them days later and inspected the shoulder when cutting and found perfectly mushroomed accubonds blown down the the base in a shoulder or they deflect. The best bullets I've seen for getting through an elk shoulder is a heavy for cal bullet that will shed the frontal area so it stays small and keeps the resistance down, or a bullet that will blow the petals of to stay small, bullet that retain a lot of weight and frontal area simply don't have the momentum to get through the heaviest elks shoulder bones.
If you shoot every elk like your shooting it with an arrow you'll find the only hard part about killing elk is hauling them out!!