For those interested, the 9 twist Kimber Montana I posted a page back shoots AAC 77tmks well. My elevation is 3300 feet. It was just shy of 80 degrees, 49% humidity. Nice round holes out to 300. Will continue to add data under varied conditions, and hopefully try some black hills TMKs as well.
The 75 grain Hornady Superformance BTHP and 62 grain fusions both put 5 shots around 1" at 100, TMKs slightly larger than that, but more than acceptable for a 500 yard setup imho.
The 75 grain Hornady Superformance BTHP and 62 grain fusions both put 5 shots around 1" at 100, TMKs slightly larger than that, but more than acceptable for a 500 yard setup imho.






