Gentlemen, There should be no bickering between us. We all have our own opininons on guns, bullets, powders, etc. Bullet manufactures have to compromise alot when it comes to certain cals. The 30 cal probably the most. This same .308, 180 bullet has to perform out of, say a 308 Win and a 300 Weatherby Mag. from ranges point blank to 'way out there'. And don't forget, making a bullet is a mass production process, using different lots of jacket material, core material, and there will be an occasional "faulty" bullet getting out to the public even with a stringent quality control system.
Back in my younger days, my go to rifle for whitetail was a Savage model 110 in .243 Win. Accounting for a bunch of deer, both neck shot and shoulder shot using Hornady 100 bullets. These deer dropped like they were hit in the head with a sledge hammer. All but one. This one took two shots and I later found out through examination that the first bullet totally disentegrated on impact and fragmented running down along the rib cage under the skin. The second bullet however broke both front shoulders causing this running buck to actually flip over when it hit him.
All I am saying is don't judge a bullet from one bad experience. We as individuals can't really condem a bullet based on the limited examples we have. Now, as a group, if we shot a few thousand animals with the Sierra Game Kings and a siginificant number of these bullets gave a less than desireable result, then we could honestly say there is a 'problem' with them.
Everyone is entitled to their own opinion and these Game Kings have been around a long time, so I guess they may be a pretty good bullet.