HMC8404 said:
...I don't much care for the all-lead rounds...
As with the other posters, I assume that this referred to .38 Special rounds rather than .38 S&W, but I think a few comments are still appropriate.
FWIW almost all .38 S&W ammo uses lead bullets; however, the round is VERY low-pressure and low-velocity by modern standards, so it generally doesn't have serious problems with barrel lead buildup even with dead-soft non-alloyed lead bullets. Judicious use of a quality bore solvent followed by a few strokes with a bronze brush should take care of any buildup in short order.
In fact, the round is subject to a few words of caution regarding FMJ bullets. It is actually 0.361" caliber rather than 0.357" caliber like the far more commonplace .38 Special and .357 Magnum. However, late in the 20th century, a few gunmakers- notably Colt and S&W, I'm not sure about IJ- used .38/.357 barrels on .38 S&W firearms to simplify parts inventories. Firing oversize bullets is generally a Great Big No-No with most cartridges, but gunmakers could get away with it in .38 S&W because soft lead bullets at low pressure simply don't cause enough of a pressure spike to damage a high-quality modern solid-frame revolver like a S&W Model 33. However, FMJ bullets are much harder than lead, and using a 0.361"-caliber FMJ bullet in a 0.357"-caliber bore at low .38 S&W pressures may cause "squibs" or stuck bullets.
The bottom line: If you choose one of the few available .38 S&W FMJ loads, I recommend frequently checking the bore for obstructions* and/or carefully counting the holes in the target during the first few dozen shots, to ensure that the bullets ARE in fact consistently exiting the bore. Either that, or using lead.
*Footnote: If this is done at a public range, I strongly recommend using some sort of stiff rope or flexible plastic or wood rod to check the bore from the forcing cone end, so the range officers don't have a fit and throw you out when they see you staring into the muzzle of your revolver.