Ok, so I like to think that I have mastered the reloading of several pistol cals. However, when it comes to rifle cartridges, I am a bit of a newbie. I currently have only tried a few batches of 223 rounds for my AR and mini14 but have dreams of one day reloading my .280 as well. Anyhow, I see bullets everywhere with cannelures but just as many without. Can someone with experience point me in the right direction ? So far I have batched out only three sets of 20 rds, all loaded with IMR 4198(19-19.5gr), 55 and 60 gr bullets and all without crimps. My first experience with 45LC rounds is that at the lower end of the loading spectrum(near minimum loads), I had poor seal-ability of brass in the chamber and plenty of pressure blasting back at my face when I failed to use a full crimp(1 turn on a lee crimper). Should I expect the same with my 223 loads, or are cannelures and tight crimps just there to keep the bullets seated ? Anyways, any advice is better than blasting unburned powder into my eyes...so I'll take your 2 cents if you have it. - Texmex