Looking to start reloading. This will be my first attempt. Looking for some guidance/help with deciding how to begin a load development. I have a rifle that "likes" heavier/longer bullets so I'm looking to load some 50 and 55 grain Bergers as they're the only one that I know of that makes larger 204 bullets. For instance, how do you determine what primer of all those to choose from to use? If anyone has any experience as to ideal powder, primer etc., I'd appreciate it. This rifle is an AR with a White Oak upper that is a 1/10. Thanks in advance.