Coupla years ago, I emailed Hodgdon about using Trail Boss for reduced loads with jacketed bullets in my .460 X-Frame and they said it was safe. Altho their reduced load recipe calls for a minimum of 70% of case capacity, I never went below 90% for fear of a stuck bullet. They shot fine, but since the loads printed so much different than standard loads, and cost about the same to make, I gave up on it.