Hi to everybody, I am new to this site and i just want to say i have found this site to be very useful. Thanks all for all the useful info. On that note I am going to re-barrel my remington Model 700, 300 win mag. I want to change the caliber to a 7mm. I am stuck on which one to use. the reason being that i am not for sure which ones will work properly so that its a repeater. I want to use 180 Gr. Bergers. I would like to use this gun for long range elk/deer hunting. Im hoping to be able to reach out to 1000 yards for elk. Or should i just simply stick with the 300. Any help would be great. Thanks.