Let's see, I have not bought a commercial round for my rifles in 30yrs. I have been quite happy with Sierra game kings, Remington bulk PSPs, and Hornady interlocks. However, I fell into my first elk hunt 3yrs ago and decided to go with "premium" bullets so I ordered a box of Silvertips. I wanted to give myself the best advantage since I had to drive 6hrs each way, set up a camp, groceries, etc. never saw an elk. Used those rounds on deer when that season rolled around. Did NOT notice any difference from standard cup and core I had been using for years.
This past season, I got set up with my regular bullets, sighted in my rifle. Had a hard chambering and the bolt stuck. Tried to rap the bolt handle with a piece of wood. Tore out the extractor and detent. NO PARTS AVAILABLE! Wife though my hunt was over. Like THAT would happen! Simply grabbed another rifle that I had bought just for the scope more than the rifle, but hadn't gotten around to doing anything with it. Guy gave me 4 boxes of corelokts with it and said that it was sighted for 165s when I bought it. So I just grabbed that, a box of bullets and sighted in. 2 weeks later, I get a shot on a nice buck. 364yds. Bullet passed between two ribs, destroyed a lung, half of the other, and pencilled through the other rib, THEN expanded and blew out the off shoulder! That dang deer ran for 3 hours until it finally died. NOT impressed!