I am not familiar with that brass - you should be able to tell if it is a small rifle primer pocket rather easily. There is considerable difference between the two in diameter. A small rifle primer will literally fall out of a large rifle primer pocket. If you are going to use a small rifle primer, may I suggest a Remington 7 1/2 or a CCI BR4 primer? They can handle higher pressures with out piercing than most of the other primers. I use the Remington mostly, because they are cheaper than the CCI primers and I get similar results. As far as data is concerned, I would use the same data, but work your way up in powder charge. It is prudent to do this no matter what reloading componet you change. Good Luck and Good Shooting.