You don't have it loaded with alternating buckshot and slugs, do you? Dutch loading has no net gain and almost guarantees you won't be knowing what's coming out of the muzzle in the heat of a defensive situation. Plus .410 slugs are very anemic (in their construction, not in their energy). Buckshot, especially if the Saiga can use the 3" shells for five 000 pellets each, will be far more effective from an HD perspective.
Sweet gun though, for sure!