I have a satin nickle airweight model 38-2 and it just has .38 Spl on the barrel, not +P. I have shot a few +Ps in it and it seems to handle them well, giving 2" groups @ 25 feet (Crimson Trace). I shoot +Ps in it because the cylinder is steel and should be able to take it. I noticed that the newer 638s are rated for +P ammo... is there a difference in strength or is it just that maybe the +P ammo wasn't out back then? I know that it may "shoot loose" later on, but it hasn't made any negative impact yet. What are your thoughts?