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Gunsmithing Short throat

Run a throating reamer down the barrel. 1000 ways to skin the cat-- can pull the barrel or make/buy a tool that allows you to do it through the action with everything installed. I've seen it done in someone's driveway before going to the range... lol
 
I deep throated a 223 AI with a throating reamer by hand, in my garage. It shot better than I did so I must have done a decent job. Not something I'd do again because I prefer a shorter throat. Shoot it long enough and you'll end up needing to load longer than mag length to be near the lands.
 
My buddy has a throat reamer and With a little research I found the hornady measuring tools and how too videos . I think we will do this I'll keep you posted