I think you need powder as well

The only way to know for sure how good/bad your shot will be at the 16 yard line is to pattern it at 35-40 yds.
The 391 is a gas operated semi auto shotgun. Its self-compensating gas system has been quite a hit with the trap and sporting clays shooters because it will digest any load from 7/8 oz up to the bad ass 3" shells (not that you use them in clay shooting).
The jury is still out on mine (3 days after getting it) but I liked the balance and the low perceived recoil. 75 1 oz #8 shells digested without a glitch on Sunday.
Too bad about the bad ass loads comment, it was a real spoiler... Looks like another good idea of mine that wont fly... You know what they say..."speed kills". (Heard this at the last practice and was getting big ideas.

) Forgot the powder...5 lb keg of clays and another of Titewad from Higginsons...not any more expensive than any other powder for reloading. One seems to load a lot in trap, of course. It's nothing to shoot 75 or 100 rounds in a practice. But you are only putting in a tiddly bit of powder for each round (20 or 30 grains

). Don't know what I am going to do with the pound of Blue Dot I bought, now that I know about the bad ass thingy...don't think that purchase counts in the equation now.
The only semiauto I have seen at our club was being used in skeet. (Shot my first round about a week ago. Even made a double and was really proud (could barely walk off the line under my own steam) until they told me I had shot them out of order. Couldn't understand what all the laughing was about so I asked if it still counted. Jeez! were they ever picky, the gd things went down didn't they...!

) Needless to say the guy with the semiauto was doing way better than me. Don't think it was the difference in shotguns. Mostly pumps and OU's at our club. There is a Beretta OU. I'm going to look at it a bit more closely. I think it is a little more finely crafted than my Citori (mine's still nice though) and a little lighter.
People mention that Beretta 391 on this site all the time. It really sounds like a terrific shotgun. I have a thousand year old Auto 5 with a 28 inch barrel on it(the ugly duckling of the shotgun world, nasty square back on it looks like someone chopped the buttstock off, but you gotta love em just the same). It has very low perceived recoil, as mentioned, and will cycle light loads too. I take it if I ever want to shoot grouse.
I still don't think trap is all that expensive really. The volume of shooting is high for the expense, which is a good thing. It's a great sport too and lots of fun. It kind of reminds me of shooting handgun in a way. I mean it feels like I am learning to take a shot as soon as I have the site picture I want. Not a lot of refinement in aiming like with target rifles. OOOPs...I'm running on, time to run away...sorry, fred