Understand your thought process, but not sure the big Brno needs to be cut. I own a 602 which was built prior to the 550. Either way mine handles well and the long barrel keeps the blast away from your ears. Remember, we are talking about 75 - 80 grains of powder going off each time you pull the trigger.

I also think the 25 inch barrel and the long action can really make the 375H&H perform. You don't need to seat to 3.6 inch but can go close to 3.8 inch. That means extra powder and the few extra inches of barrel make all the difference.

Now if you shoot the 375 as a DGR you can do with less length and you don't really need the extra speed, it may be counterproductive in this instance.

BUT, if your 375 is an allrounder and you shoot large game, the extra speed can make all the difference. A 300 grain Sierra boat tail at 2700 fps is an awesome large deer / antelope round. Check out the ballistics to 300 yards. Very impressive indeed. You can also do 250 - 260 grain bullets at 2850 -2900 fps in the Brno. So who needs a 340 Weatherby.

That's what you give up by cutting the barrel to short, you'll give up 35 - 50 fps. Non event on dangerous game, problematic with potential long range loads.

At the end of the day, your call.