Is it true that any 2 3/4" star crimped load will be approximately the same as a 2 1/2" roll crimp. In other words, if I get on the Hodgdon website and made a roll crimped 2 1/2" load with a cut down AA hull and a recipe from a 2 3/4" load, will pressures remain similar and performance be close, out will I simply blow up my gun or myself?

Also, simple solutions for cutting the hulls would be appreciated.