Hey, 100 rounds isn’t even enough for a decent day at the range.
Well, it is for me and my shoulder. A gunsmith friend was repairing a Saiga (sp?) AK-type shotgun. We burned about 100 rounds through it testing it. The light loads were fine, but the heavy loads really smacked us around. The owner had never cleaned it, and the gas system was full of carbon and chunks of wad. After a good cleaning and some adjusting the gas ports, it ran fine, but had a real kick with heavy loads, no matter how it was set.