Big Joe, there are a gazillion methods to break in a barrel. I'd guess that all of them are good in one way or another.
But the ones that feature firing 100 rounds would be brutal with a 300 Winnie!
I'd suggest a shoot and clean routine like this:
Shoot one round and clean. Repeat five times.
Fire two rounds and clean. Repeat five times.
Fire five rounds and clean. Repeat five times.
That's a total of 40 rounds. In a high-intensity or large-case caliber like the 300 Win Mag, that may be enough.
If the bore still seems rough or hard to clean at that point, start over.
I can't help you with the trigger as I've never owned a Ruger rifle.
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