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This is how your supposed to do it. I would try a few different brand of ammunition (budget permitting) too as some pattern differently.
You can run slugs through anything other than those very tight turkey loads. As long as the manual says it's good, it's good.
I love my Steven's 301. I have a 410 and it's lighter than my favorite H&R mod 88 12GA.
Have fun OP!
Keep it civil.