I just bought my first gun, the 686, although I have used one before. When I went to purchase ammo, they said for the first 250 or so shots I should use a good ammo, so they sold me 38 spl 125gr FMC-FLAT. I cannot find anything about this particular ammo anywhere, so is this what I want to start out with at the range? And, if so, what kind after that for regular practice? And also what kind for home defense?