I have a Marlin 444S in 444 Marlin. It has a 20" bbl. I'm wanting to chop it to 16.5". I'm planning on loading the hornady 300 grain XTP's. I don't plan on ever needig to take longer then a 200 yard shot with it. If I cut the bbl down will I be cripling the cartridge? Hornady's reloading manual says you can get them moving about 2000 fps. I would still like to be able to get near those velocities. It has a 1 in 20" twist with the micro grooves they did a while back. Any help would be appreciated.