Here is what I have seen out of my custom 10/22
Remington Golden Bullets Bulk - Got some about 10 years ago. Very good accuracy. No problems with leading, clean shooting. The very rare round that would not go off. The report when fired would not always sound the same (indicatinig some issues with charge consistancy), but they were very accurate. 0.25" groups at 50 yards.
Remington Golden Bullets 50 Round Boxes - bought around 5 years ago. OK accuracy. Much more frequent misfires. Far more noticable changes in the report from shot to shot. Clean Shooting. Larger than .5" groups at 50 yards
Federal Bulk Bullets - Slightly better than average accuracy. Very consistant with the Report from Shot to Shot. Very rare to have a misfire. About 0.5" groups at 50 yards
PMC - I have not fired these for years and years, as they are hard to find where I am. Back 20 years ago, I found them to be very accurate, very reliable, and very consisitant with reports from shot to shot. 0.25" groups at 50 yards
Federal Automatch Bulk - Very accurate out of my 10/22 (As accurate as the old Bulk Remington golden bullets used to be 0.25" groups at 50 yards). Very consistant report from shot to shot. Never had a misfire.
Eley Ammunition - I tried 4 different types of the ammunition. I was not overly impressed. I found that they would group better than 0.5" at 50 yards, but never got one to group down to 0.25".
CCI HiVel Ammo - I have found it to be as accurate out of my gun as Eley. It is very reliable. I do not use it because the Federal Automatch is slightly more accurate.
CCI Stingers/Quik Shok Hyper Velocity - I have found these hyper veloocity bullets to have slightly below average accuracy, with slightly larger than 0.5" groups at 50 yards.
Winchester X-Pert - I was not impressed at all by this ammunition. Leading was very bad. Accuracy was slightly lower than average. The report was pretty consistant from shot to shot, and the bullets always fired. After I decided not to shoot this ammunition out of my 10/22 I decided to use my SP101 in 22LR to burn up the rest of it. Leading was so bad, that after about 150 round, the cylinder would not spin. I had to take a brass brush I brought with me to scrape off the huge amounts of lead from the front of the cylinder. I shot another 100-150 rounds through it that day. That evening when I was cleaning the gun, I decided to see how bad the leading was. The inside of the barrel looked like a smooth bore leading was so bad.
I find it very fun to test different ammunition - I plan on testing CCI Stinger Subsonic ammunition the next time I am on leave. I am going to concentrate on Federal Automatch though.
Charlie