I am renewing my shooting and reloading hobby that I put aside in the 70's to raise a family. I shot S&W .357 revolvers then but now the 9mm has got my interest. I have applied for CCH and I have an LC9 to start out with for my carry weapon. I would like to buy a M&P 9 to use to improve my shooting skills and not necessarily get 2" groupings at 25yd.

Is there any reason I should not buy the FS M&P 9mm for the purpose I have described. It seems to me the issue is the weapon will not provide something less than 3" grouping at 25yd. For my purpose I really don't see an issue.
Thanks for your input.
Ken