Alright, here we go!! Begin RANT!! Why not?? Please pay attention! This is the reason I don't post a lot and usually just lurk. People here refuse to read the posts before they respond. They are so sure that they have the dang answer and they are right!! This is not only directed to the quoted poster, but to all of those in this thread (and every other thread on this forum) who think that they know what the OP is asking without reading or putting any thought into their answer. The OP here is asking if he can get load data for the .308 Win round!! Not if you can put 53 gr of IMR 4350 into a .30-06 case and then stick a 220 gr bullet in front of that!! Since he has a rifle chambered in a .308 Winchester, he doesn't really give a sh!+ about what you can do with a .30-06, a 270 Win, a .404 Jeffires...!!!
I have 7 manuals open before me, one of them being an IMR loading manual in front of me right now. It lists 46 gr of 4350 as a max load, compressed, for the 180 gr bullet. Cartridge is listed at max OAL. Let's compare this to the .30-06. With a 180 gr round it has a max charge of 57.0 gr compressed. With a 200 gr round it is 55.0 gr compressed. With a 220 gr round, it is 53.5gr compressed. Now the avg volume of a .308 win case is 3.43 cc and the avg volume of a .30-06 case is 4.83 cc. With a 180 gr bullet, 46gr of powder in a .308 Win case, you have a compressed load. if we were to do simple math, (and I know that this is not correct but humour me), a compressed load for the .30-06, 180gr is 57.0 gr powder while, a load for the .308 Win is 46.0. 11 grains different. Let's imagine that the same difference is found throughout the spectrum. With a 200 gr bullet, we would need 45 gr (if 46 is a compressed load with a 180 gr, then what is 45 with a 200 gr or 43 with a 220 gr?) I have tried this 46 gr fills the case. I am not a ammunition expert and more than I am a licensed mechanic, but I do know that some things shouldn't be done. When the manufacturer lists data we should be aware that is is on the safe side; however, don't just pipe in a say "well I don't know about the .308 but my .30-06 eats them fine with 53 gr of that powder!" You can't even get that much powder in a .308 Win case!! Somebody, PLEASE, tell how this is possible and why we need to hear your opinion on how a your completely DIFFERENT PET LOAD will react in a weapon the OP doesn't even own!!
PS!! PLEASE READ ENTIRE POST, THEN ENGAGE BRAIN BEFORE CONTRIBUTING