On Practicing - Using a 9mm?

First topic message reminder :

Just a thought ...  Is there any downside to practicing with my S&W 39-2, 9mm instead of the .45?  You guys have already zeroed in on my problem with the .45 in that I'm anticipating the recoil and reacting in advance to it, a problem that I apparently don't have with the .22.  So, I was thinking that since the 9mm recoils almost as much that I could use that instead considering the ammo is so much cheaper.  I haven't started reloading yet (still can't find the powder) so the .45 is getting a little expensive to shoot.

Rob,
The "ulterior motive" had to do with a retailer that didn't want to sell a reloading press because they didn't have the powder not a recipe for bullseye powder.  Just wanted to clarify that.

whatever reloader you get buy a rcbs lockout die it will prevent double charges or empty charges, this can save you from injury and save your gun from damage, its the best insurance you can get, buy the 650, it has enough stations to add in the lock out die