I have a Remington 78 Sportsman in 270 Win that I call Frankenstein. It's an old beater POS elk gun that's been stepped on by a horse, dropped off of a small cliff and run over by a four-wheeler but still keeps shooting great...which is why I won't bring another gun along when we horse it in to camp. They just get beat up too bad. I developed a load for it a few years ago with H4831sc, 140 Accubonds and Federal 210's. It consistently shoots around 0.75" at 100 which I thought to be pretty good for that gun. Last week I decided to chrono it for the first time and the velocity ranged from 2798-2864 and it shot a group just over 0.500" at 100 yards for five shots. At what range will this velocity variation become an issue? Is it an issue at all? What are some potential causes of this? I don't forsee ever having to make a shot over 4-500 yards where we hunt but just in case... I'm more curious than anything else. I've never had an issue shooting anything with it...yet. Knock on wood. Thanks.