H&R 10 gauge choke ammo ?

[Bobby5]

 I have a h&r 10 gauge turkey with the short barrel and screw in choke.  I searched and found some info but was wondering what ammo and choke tube should i get. I was thinking about getting some magnum blends for ammo but was unsure on the choke.  The barrel is short does this effect range with the right choke tube? 

[lowoctane]

 
I would contact William at Sumtoy as he builds chokes for all gauges and he can recommend a combo because of his hands on.