So I own some glocks. They're all 9mm's except for one that I just got from the EE here. It is a 10mm, glock 20. I got it to replace my 357 mag as a woods gun. I knew ammo was expensive when I made the deal, but I am put off by spending 50 cents a round to blast at the range. I am contemplating putting a couple hundred rounds through the 10mm to establish reliability and familiarity, and than doing the majority of my training with the 9mm but still shooting some 10mm each range session to keep things fresh. In my mind, it stands to reason that shooting one full size glock would help me improve shooting another glock of similar size. Kind of like when people shoot 38 to cheaply practice their 357. I know the recoil is significantly more than 9mm but then again, 357 kicks the crap out of 38 and that's a pretty accepted practice technique. What do you guys think?