The creed case is ideal for 6.5 but with the heavy bullets of 7mm that might be a different story. Lot of difference between 143 bullets and 180 in 7mm.
Ackley worked with the 7mm mauser case a lot. Ackley improving it to several calibers. One time i remember of him experimenting with a 308x1.5. He chronographed a 150 hunting bullet at i believe 2500. He loved efficiency, and disliked overbore cartridges. He was what got me on the 280ai, 10 years before nosler applied to saami.
Ackley worked with the 7mm mauser case a lot. Ackley improving it to several calibers. One time i remember of him experimenting with a 308x1.5. He chronographed a 150 hunting bullet at i believe 2500. He loved efficiency, and disliked overbore cartridges. He was what got me on the 280ai, 10 years before nosler applied to saami.