Wow, a lot has changed since I was on the forum last. It seems the Gamos have gone downhill - sadly.
Greetings Jax,
I'm no expert by any means, but I can tell you that the GRT-III makes a huge difference. That trigger creep is a beast! I've set my Cat up with a one piece, low scope mount with a built-in recoil pin. I made the mistake of getting a mount without the pin at first and boy, did it ever creep after just a few shots! No amount of tightening it down would stop it. That pin is a necessity and makes the mount rock solid. Next I tried several different types of scopes but settled on the Leapers "Under The Gun" UTG 3-9x40 Full Size Mil-Dot "True Strength Platform" scope (SCP-394FMD2-C) that has been an absolute joy to shoot with. It's a bright scope that not only looks good cosmetically but gives you a nice, clear and close up sight picture. I added a bi-pod when I first got her a couple of years ago and for target shooting on a bench I absolutely love it. It's detachable so quick backyard plinking is easy, too.
Personally, I've been using the Crossman Premier Hollow Points with great success. Every rifle has different needs and you'll have to find your girl's preference, but mine, like many others', just seems to prefer these. I've tried several different brands and weights but I just keep coming back the Hollow Points. Remember that the Cat needs to be worked in. Don't expect really small groupings right out of the box. She's gotta get loosened up over time and the only way to do that is to put a good amount of lead downrange. I can tell you that right now, after having put several tins of rounds through her, I get dime sized groupings with these Premiers at 10-20 yard ranges. I like to go to the local range and plink shotgun shells at 20 yards with these pellets.
Sadly, I haven't been able to afford a TurboTune but, I've been plinking squirrels and chipmunks in the backyard to keep them off the bird feeders very accurately over the last few weeks. The wife is a bit of a naturalist but finally gave me the OK this year to engage targets since the poor birds weren't getting fed at all with the neighborhood bullies around. *chuckles* The local rodents have been falling to my Kitteh regularly and have started giving the feeder a wide birth. He he he
Enjoy your new Cat. With some TLC and a bit of work she's definitely a keeper, IMO.

LJ