I have a savage model 10 law enforcement with a 20" barrel. Action is bedded. I am wanting to change to a longer barrel to achieve longer burn rates and increase muzzle velocity. I hand load all my rounds. I use lapua brass large primers. I shoot sierra 155 palma bullets 2156 and berger 155.5 fullbore. I'm trying so decide which barrel to purchase. My question is what is the difference 308 win, 308 palma and a 308win F-tr.