I have reloaded about 150 rds of .308 Marlin Express. Like meationed above the factory cases were all longer than the factory maxium. And required alot of case trimming. I worked up a load for my .308MX. At 100 yards my 5 shot group was .675". Compaired to the factory ammo with a 1.45" group. What worked for me was CCI LR primers, of course Hornady cases full length sized, 160 gr. FTX .308 Hornady bullets, 37.6 grs. of H4895, with a OAL of 2.600". Also to comment about the new powders that have came out for the Superformance line of Hornady ammo. This powder is extreamly dirty and if you shoot it I promise you'll be spending a couple of days on cleanning your barrel. I had a very good reloading friend of mine that loaded some for is .243 Win. and only after shooting 10 rounds noticed that his groups began to grow concerterbly. Upon inspection the problem was with the fouled barrel.