I shot 777 pellets for many years, they are extremely easy to use for sure. They did build a "crud ring" just above where the bullet seated. Could shoot 3-4 times then would have to clean it out or bullet would not seat. No problem when hunting, always hunted with clean barrel and could get the second load in without swabbing. I did make a batch of swab solution out of windex and a industrial solvent we use at work, was some good stuff as long as I didn't get it on me