As most others have said, try Li'l Gun and 35 or 40 gr V-Max or BT's. Personally I have difficulty getting 13 gr in any case except Remingtons, about 12.5 gr is about all I can get into the others. YMMV.
I found Hornady brass to have the largest capacity of all, and took 13gr of Lil'Gun, which I found to be PFM in the Hornet.
Jeff
