I shot 777 pellets with #11 caps this past weekend. I think I had a delayed ignition a couple of times. I heard a crack then boom, where when I used the 777 powder I heard just the boom from the primary ignition. I thought, until I read this page, that my nipple might have been blocked and was delaying the ignition slightly. I will shoot it again this weekend and try to verify the delay. I have 777 in both forms. I am shooting a Knight T-Bolt rifle. Ken