I'm reloading 223 and I currently have Winchester 748 powder and Remington 7 1/2 primers. My question is which brass is the better of the two to get as many reloads as possible? How are they for accuracy? I know the cooler I keep the load the longer the brass will last but are they the same in quality? With the other components I'm using does one suit better than the other? The bullets will be hornady 55gr FMJ since I have 1000 of them. I will also be looking into the serria match king 69gr bullet also. Lastly I know its the wrong time to ask since I already ordered it but how is the 748 powder? Good quality? I saw that it was available so I ordered 5 lbs. I see today its out of stock. Please advise. Thanks