I think any of the three will throw some real foot pounds down range. I have the Beowulf and if you hand load it is not that bad, the brass is not cheap. I bought 500 cases and they have lasted me for 8 or so years. If anyone wants some load data and chrony results send me a private message. I love the Beowulf and with the 50 cal pistol’s plenty of bullets around and stuff like Rainer that cost less.
I have a 2X Aim point and it shoots very tight groups w/bullets touching at 50 yards and good at 100 yards. They claim it is effective at a max of 200 yards. I have the entire gun from Alexander Arms and both uppers the 16” Entry Gun, the rifle upper 24” w/brake. I plan in trying the rifle upper this summer see if it will group at 300 with the lighter bullets, have fired them as heavy as 420 grain. I have not used the rifle upper much the 16” shoots great.
I thing the rifle upper would give you 200 yards with good accuracy.
I know the Beowulf has seen combat and is effective for shooting through vehicles and walls, it is a real powerhouse.