My dad and uncle were very much into Ackley's system. I grew up shooting an AI 25-06 as well as a .35 AI. Read on an old thread that u could fire factory loads out of these and it raised a question for me as my dad said that was never to be done!! We always used factory .270 Rem cases but also had a "hot" load to fire form the new brass and then a different load after that. Anybody else out there ever hear of necking down .375 HH Mag brass to a .35 AI? Would love to hear any info or thoughts on this.