The first line of defense in taming recoil is mass (weight on planet earth).
Here is a useful recoil calculator:
[url]http://www.beartoothbullets.com/rescources/calculators/php/recoil.htm?bw=400&bv=1800&cw=30&w=6[/url]
I've guessed you are using a 400 grain bullet, 30 grains of powder (total guess), and your gun weighs 6 pounds. OUCH!
The calculated recoil energy is 35 foot-pounds. That's like a mid-range 12 gauge shotgun.
[url]http://www.chuckhawks.com/shotgun_recoil_table.htm[/url] if you want the formula, it's here, too.
If you are shooting a 325 grain bullet with 30 grains of powder at 1950 fps, the calculator gives 29 foot-pounds of recoil for a six pound gun.
My frontstuffer shoots 300 grain bullets at 2600 fps using 50 grains of powder. It's kinda special. IF it weighed 6 pounds, it would have a brutal 54 footpound recoil. It actually weighs 9.5 pound (ug to lug) but brings the recoil energy down to a stout but comfy 34 ft-lbs.
Let's increase your 6 pound gun shooting 400 grain bullets with 30 grains powder at 1800 fps to 8 pounds. The recoil goes from 35 down to 26 ft-lbs... that's 74% of your original kick, for the cost of 2 lbs in weight.
OK... here goes- things I have found that reduce my "impression of recoil"
1) WEIGHT- actually reduces recoil
2) Good fitting stock. When the stock fits your build, it doesn't reduce recoil, but the recoil isn't pinching or biting you.
3) Good pad- maybe it's just part of a good fitting stock, but the Pachmayer decelerater on my skeet gun, along with a professional fitting made my 12 gauge very nice to shoot. Before fitting and pad, 50 rounds gave me a big bruise! Kick Eez pads are made of recoil absorbing elastomer plastics, too.
4) Good balance of the firearm. I prefer slightly barrel heavy, as it gets your stance leaning forward, in to the gun. So, consider weights under the handguards as well as in the stock. It doesn't reduce recoil, but it feels like it does.
In my opinion, those are the first things to chase after. Assuming you refuse to load a less kick-ass round!
Next, I would look in to a variable gas system- either an adjustable tube or a block- because I have no idea how much extra gas that freaking Beowulf produces! You might be able to save yourself a bit of a big "twang" load.
Finally, a muzzle break can help- but it's got to direct gas and NOISE back at you to reduce recoil. I think the big honking JP sherman-tank style break may be very effective, and all that weight out on the end of the muzzle can't hurt, either! You might want to call JP and have them ream one out for you.
So- before somebody waxes all poetic about muzzle breaks, consider this- you have 30 grains of powder, and 400 grains of bullet. All the powder turns in to 30 grains of gas.
Even if you had ALL the gas going as fast as the bullet, and ALL of it is used for recoil reduction, that at best reduces the bullet weight by 30 grains, effectively. That gets you from 35 to 31 ft-lbs, perfect world. Hey, it works, and you can see the upper end of what you might expect.
Good luck. You have an awesome beast. I sure would not spend extra money for a light weight scope!
Pete