one hole'
it seems to me that some of us haven't studied the ballistic results available with some of the .44 mag' loads. if j.d. jones has gotten nearly 1400 fps' with a 320 gr' hard-cast lead bullet out of a 7 1/2" revolver safely, then i think the .44 is misunderstood by those who play down its abilities.
i'd get some good jacketed or gas-checked hard-cast bullets for your barrel and load them as .44 mag's --- keeping in mind that today's manuals understate the design parameters of the .44 mag'. it was originally designed for a maximum product average chamber pressure of 43,500 cup. (the .357 mag' was designed for 46,000 cup originally!). if you get some 'weight-forward' bullets, like j.d.jones and randy garrett have produced (and others), you'll have more of the bullets weight moved into the nose of the projectile outside of the brass case. this leaves you more room in the cartridge for powder....and the ballistics are greatly improved with the heavier bullets.
i'd start with 240 gr' hornady xtp's or 270 gr' speer gold dots and see what you get. then try a cast bullet with a gas check like i described above and get ready for even more velocity...... and, tell us how well you've done with it all, please.
good luck,
ss'