The 1-38" MicroGroove does well. I am not a fan of the heavy bullets in the 44 mag. I prefer a 200 XTP for deer. I have a 2001 Ballard rifled 444 and it seems to shoot the 240 XTP very well. I am trying the 265FTX bullets but to work around the length, I trim the rubber tips at the edge of the jacket so that they function properly without have to shorten cases. I have some 300 grain HP that I got as part of a deal but have no desire to use them in the 444.