You're going to LOVE the 10mm, especially in the 610- some of the most accurate Revolvers/cartridges ever produced.
Had a Deputy friend who has/had one (now 2 the last time I talked to him). He got the 5" when they first came out back in the '90's.
He scoped his with a Nikon pistol scope, a 2-7 or so, variable.
He showed me the group he shot with some 200gr Hornady XTP's that I had reloaded for my 1006 S&W I had sold. He had a 5 shot clover leaf, and one called flyer that opened group to 2", fired at ......100yds!
He claimed he had spent most of his life trying to get rifles to shoot that good and often failed.
He later got a 6.5" version when word got out they were discontinuing them. ( they did for a while, then reintroduced them).
You will get good loads with both jacketed and cast slugs.
Depends what you're looking to use them for.
For inexpensive plinking the cast bullets are best, and also for high end loads too, with appropriate powders.
Jacketed bullets of course are excellent.
www.glocktalk.com has a forum just for reloading the 10mm, I suggest you start there for additional information and data.
Keep in mind that the Revolver does NOT have the unsupported case head issue that some Semi-Auto's have so you're not as restricted in loading flexibility, both at the top and bottom.
I prefer the 175-180gr bullets for cast, and the 150-155gr jacketed. I have killed deer with both the 10mm and .40, and prefer the lighter weights in jacketed bullets. I have yet to recover a bullet from a deer with 155gr to 200gr HP's, so don't worry about lack of penetration, except perhaps the 135gr JHP's.
My favorite slug is an old Lyman mould that was produced back in the '60's for the old Herter's .401 PowerMag cartridge. It is a true Keith style SWC and casts at 178gr from wheelweights. I have shot 6shot cloverleafs with it at 25yds both with above noted friends 610 as well as the 1006 I owned.
Some day, I'm going to get another 1006.
