308Sako (name?) I'm a firm believer that you can earn points at the reloading bench long before you hit the range. Here are a few thoughts: Take no shortcuts, measure more things than you "need" to, keep notes, look for changes in your brass, take care of them before they get out of hand, don't ignore even the "mildest" signs of excess pressure, try new things, but not all at once.
OK, that's all kind of generic. Here are some specifics. Measure case neck thickness with a good tuning micrometer. Learn to turn necks well and do it. Make it an art form. Measure case bases with a blade micrometer and a little fixture so that you measure at the same height each time. Use different dies, see which matches your chamber best. You need clearance, but not too much (0.0015" at the base is plenty). Measure your throat with a Stoney Point or similar tool, keep track of it and set your seating die accordingly. Weigh those powder charges!
What I'm saying is to take your reloading as seriously as any other part of your shooting program. Do more than you need, be curious, check, double check and triple check things. Problems come from overlooked areas and things you didn't think of. Do maintenance on your loading equipment, keep dies and press clean (carbon dust is very abrasive). Go to the firing line with ammo that you can honestly say is loaded to perfection, then you can focus on shooting with one less major concern - and a small leg up on a lot of your competition.