Sittin' around my local gun shop, I've heard this alot. My Smith tells them
"it's preferance"....With your scope you can go as low as 36mm before touching the barrel. That's good..My opinion is "Go as low as you can go".
This regards to your rings....For the base, I've found 1 piece base's are
stronger, but you may have more options on a 2 piece style. I use several
manf. ie: Leopold, Burris, Larue Tactical, it all depends on....what else.....
Preferance...
The rings for your model are 1", so you have many options....
Your gun smith would help you with these options....If you want to really smoke the O'l brain cells, ask to look thru his Brownell's catolog.......you'll be
awed at the list.
I hope this sheds a little more light....