Loading Lead in a 44 Mag ???

[PJgunner]

Rocky's coments are spot on. In fact, it can be critical towards getting good accuracy. What you need to do is get some soft lead sinkers.The eggshaoed ones work just fine. Run about three though the bore of your gun and measure carefully. Run a couple through each of the cylinder's chambers and measure those.
Let's look at the numbers. Assuming your bore has a groove diameter of .429", the throats of your cylinder should be at least .429" to .431" with probably .430" being about perfect. If the cylinder throats are smaller, say ,428", the bullet will be swaged down to that size and will be a sloppy fit in the bore and will probably lead the barrel quite badly.
FWIW though, all I shoot in my .44 Magnums are cast lead bullets that I cast myself. yes, I do load them to full power.
Paul B.