I have scanned the reloading data sheet from Lee, it can be found on my site at http://www.netassassin.com/reloading/50%20beowulf%20reloading%20info.pdf
I have loaded the 350 and the 325 at the suggested powder amounts. Man what a blast this thing is to shoot. Like the other guy I put the ACE stock with the recioal pad on it. Sooo much better, I started shooting it with a colapsable stock and man it felt like someone punched you in the sholder every time with that thing. So I switched the stock out... even the foam on the recoil buffer tube on the ACE is nice, cause that 50 will rattle you a bit if you don't have a good cheek weld. The foam gives you a bit of padding *duah* if shooting on the move and you squeeze off a shot when not in the best rifle welded position.
I shot a carbine competition with it a few weeks ago, about 120 rounds by the time the match was done. I am 6' and 220# and it rocks me a bit when I shoot the beast. But man can you see the holes on the IDPA targets. Even wth the ACE stock I had a bruse that wend from my sholder halfway down my bicep. The damage was done to the sweet spot you stick the rifle in, the rest of the uglyness came from the bruise simple spreading as time went on. It was ugly, but oddly didn't hurt. Using my arm for the next few days was interesting too.
The SO counted me a shot down on one stage because I hit the painted part of a target that was suppose to represent "hard cover" I dunno what that cover was made out of because a fully loaded 350 gr round out of that rifle will penetrate most anything and then keep going... maybe he was suppose to be standing behind a tank or something. Cause a car, brick or cinderblock wall, tree trunk, etc would not have helped him much. It was a zero shot though, all my shots that way were zero and ones... I had points down during the practical because I simply could not shoot that many rounds into several targets in the time given... all that having to aim again and force yourself to pull the trigger for the seventh time in a row kind of issue. My time was dog slow, the reason for both was I had to force myself to shoot the targets after the first magazine or so, then everything went numb and I just was enjoying doing head shots at 15-25 yards and watching the burms explode behind the targets.
The range owner let me nail an old fridge he had. *The old all steel kind that were rounded in the front, circa 1960s or so* There were plenty of .223 holes in the front of the fridge, and none left the back... the beowulf put a good sized hole in the front, blew a big hole in the back, and then decimated some very large rocks that were on the hill behind the fridge. I love this round! I can't wait to use it on the wild hogs here in TX.
I use a dillon 650 to reload the rounds, you can't use the case feeder as the cases would lock into one another. To use the dillion you will need the following parts from them (in addition to the Lee set for the dies)
1.) a 762x39 shell plate
2.) the same feed ramp used for 45 acp or 308
3.) the large powder funnel
4.) the 50AE powder die (you won't be able to use the lee powder die or funnel if you want to use the dillion powder charger.)
I can press out two hundred or so an hour simply because I treat the thing like loading a rifle case. You will need to case lube the brass, and I clean my primer pockets but some may decide to skip that. (it would sure speed things up.)
I would stick my light further back, or get the muzzle break for the rifle if you want to save on surefire bulbs. and go with a free float rail system with a grip on it instead of trying to mount some of the plastic ones. It will run you a bit more *well okay a lot more* but it is worth it and will allow you to mount your light anywhere along the forarm of the rifle. So kind of a two birds with one stone thing.