Also, it rather depends on what one is "practicing for." Example: for my carry guns, I always practice with either my carry rounds or with my handloads of the same bullet weight and power factor.
If I were a pretty serious handgun hunter, I'd make sure I practice a fair amount with my hunting loads, or more logically, handloads that approximate the power factor and bullet weight (read same point of impact).
If you're just shooting for fun, I would definitely get into handloading as soon as possible. The .44 mag is just make for handloading. I shoot many thousands of .44 a year, and I enjoy loading a moderate load that doesn't hurt me yet is fairly warm. Also, I load .44 Specials by the thousands and they are fun to shoot in shorter barrel .44 mags. It's not easy to take advantage of the wonderful .44 Special round in your .44 mag because a box of factory rounds is likely to cost more than .44 mags rounds.
I didn't address your question very well, I realize, but as a .44 mag shooter for over 30 years, I thought I'd add my two cents worth. I'm a Smith Model 29 lover and own/shoot them in all barrel lengths. Great cartridge with amazing flexiblility, particularly if you have a Dillon in the garage.
Enjoy!
By the way, hope you're catching all the .44 magnum 50-year anniversary articles that are appearing in all the gun rags. Just got my American Handgunner yesterday, and John Taffin has written one, too.