1. 7.5 to be sure, some get by with 8
2. 2923 using norma mrp in a 24 inch barrel
3 46gr of N560 coated DTacs
4. Great round for killing deer say within 800 yards my personal limit. I do not think any manufacturer sells a rifle that will do the job. It is going to take a custom. Go AI and you will probably never have to trim your brass.
