I've still got a good supply of regular H4831, but I'm planning on trying the short cut version the next time I've got to restock it. Others have said it winds up burning about the same but meters easier...I'll find out in a year or so at the rate I'm using up my current supply (or I just better start shooting more
I stumbled onto the 100gr FB X-bullet as my rifle's favorite bullet shortly after I bought it back in '95. I stocked up so many I didn't need to buy more til a couple years ago. They discontinued the flat-base 100gr, it's boat-tail only with the new triple shock lineup.
I really don't care if it's a flat-base or boat-tail as long as I can work up a load that groups as nice as that one. This rifle sure seems notice a difference between the styles though.
I have got a couple of good loads with Hornady and Sierra bullets but I'm dead-set on finding another Barnes that works in this critter. I love how they perform on whitetails!
Someday I'll find the magic combo again...I've got lots of time since I've been sticking with one of my 6.5x55 rifles for deer season the last couple years.