I'm not particularly fond of the Federal Hydra-shock round as I think it's over rated. I prefer the Speer Gold Dot ammunition. I feel the performance is better and it costs less. It's a matter of personal preference. Sort of like the "Coke vs. Pepsi" debate. Due to it's size, the Glock 27 can be a rather jumpy gun. I use the 165 grain bullet weight in my Glock 27s' and Glock 23. You may want to start out with a 180 grain bullet weight. I found that the heavier bullet made the Glock 27 easier to shoot. This is good for mastering the basic shooting fundamentals. Once you've got your shooting technique down and you're able to accurately place rounds in a target on a consistent basis, then you can experiment with different bullet weights, ammunition brands, etc.
Due to the size of the firearm, the Glock 27 gave me a problem with the grip. My baby finger would dangle with no place to go. I strongly recommend picking up a "Pierce" brand grip extension for each of your magazines. There are many different brands out there. I found "Pierce" to be the most comfortable and trouble free. There are two types out there. One type is simply a grip extension, the other will add 1 round capacity to your magazines. My theory is that in a gun fight, you can never have too much ammo
, so I have the +1 extension for all of my Glock 27s'. Again, this is a matter of personal choice. Which ever option you choose, be sure that you get everything set up the same way. You don't want to be guessing which magazine is which.
The most important part of shooting at this point is consistency. Learn the right way the first time, and be consistent.
gf