I have been messin' around with the Hornet myself. I have both the Hornady 6th edition and 7 th edition. In the rifle section - Both have Lil'gun listed as a starting load of 9.5 grains and a max load of 11.7 grains using WW cases, Win srp and the 45 grain Hornet bullet. In the pistol section they have the same starting load but go up to 13.1 grains, in both manuals. I would stick to the rifle data, since you are talking rifle. I am not sure where you got the 11.9 figure from. Speer in their newest book Manual #14 (in the rifle section) uses WW cases, CCI 500 (small pistol) and their 45 grain bullet has a starting charge of 12.0 grains of Lil'gun and a max of 13.0c. They also warn against using small rifle primers with their loads, they said it will give dangerous over loads and more erratic results. I have several loads ready to try out right now. One of them is the WW Case, CCI 500 primers, 12.0 grains of Lil'gun and the Hornady 45 Hornet bullets (the starting load for the Speer manual. The bullets are seated far away from the lands and my gun has demonstrated in the past that minimum loads listed are minimum loads in my gun. A Handi SL with a 20" barrel, I also have a Savage model 40 and it has demonstrated to me that it will not handle the same loads that are safe in the Handi. Remember your gun is a CZ and has a .223 bore not a .224 bore. I would most certainly start at the minimum and proceed be very cautiously. BTW even though Lil'gun looks great on paper, I have not had the best of luck with it. I keep trying different loads, but I get erratic results. I get fliers, a blown primer now and then, even with minimum loads and when run over a chronograph, high SD figures and some times as much as a 300 fps range . I keep coming back to it like a moth to the flame, because of the promised high velocities with medium and heavy bullets (for the Hornet). I have been having better luck with H110 or WW296 with light bullets 34 - 35 grain. I get smaller SD figures and just under listed velocities with the suggested loads, as expected, because of a 20" barrel. Good Luck and Good Shooting