i own a remington model 700 SPS varmint topped off with a vortex viper 6.5-20x44mm and right now its shooting just smaller then 1/2" groups at 100 yards and have made shots successfully out too 589 yards. I will be going down to Montana this year and will be hunting Elk and Deer either whitetail or mule, which ever one is bigger and steps out in front of me . I will be taking my 300. wsm for the elk but wouldn't mind taking the 243. win for the deer! i love this little cartridge and WOW can my rifle shoot!! My neighbor took a 320 lbs 170" mule deer at 387 yards a few years back and another 240 lbs 170 3/8" buck at 110 yards and both deer never went further then 25 yards. I know it can take them im just unsure on which bullet to use. right now my rifle is shooting 7/16" groups at 100 yards with the Federal Premium 80 grain soft points at 3300fps and would like to stick with it but im unsure if the bullet is big enough. Like obviously with a well placed shot the bullet will do its job but which bullet would you suggest?