Grandpa:
And a welcome from me as well! I hope you are as satisfied with your new R9 as I have been with mine for th past 3 years and 5 months.
As for the ammunition, I've begun regularly carrying 147-grain Remington Golden Sabers in my R9, which has shown no difficulty in digesting the "heavyweights." When it comes to self-defense ammunition, I've gradually come around to the "big-and-slow" school.