I think that you will find that bore dimensions will vary widely among old rifles chambered for the 32 L centerfire.  The cartridge was similar to a 32 Long Colt, and yes, you should be able to reload 32 LC for a 32 L centerfire.

I believe that originally, the 32 L Colt had an outside lubricated bullet of diameter of approximately .311-.314" and a case diameter of similar diameter. At some point, and those with more historical knowledge than I can provide more info here, the cartridge became one with an inside lubricated bullet of approximately .298" with a hollow base with a relatively thin skirt that would (should?) blow out upon firing to fill the bore and grooves of the barrel.

There are bullet molds available that cast a bullet with a reduced diameter heel to fit inside the case, and a larger ~groove diameter forward of the case to fill the bore/grooves.

Tom at Accurate Bullet Molds can cut you a heeled mold of proper forward diameter to fill the grooves in an odd-sized barrel.

I have a Ballard No. 2 in 32 L that I reloaded for with a heeled bullet and 32 LC cases.  The groove diameter of my barrel is .308" and reloading was not too problematic.  However, the bore is toast in that rifle, and I will have it relined and rechambered to 32 S&W Long, for which there are ample bullet molds and brass.

I have relatively little experience with the 32 L, so I expect that others here will have much more helpful information for you. 32 L barrels can certainly be rechambered for 32 S&W L if the rifle is not original and has lesser collector's value.

I have a Favorite (1915 I think) that is in 32 L (rim fire).  The 32 S&W will not chamber but the 32 LC will chamber.  Ok, I may or may not ever get to it, to change the block to CF.  Then, of course, is the issue of strength and the loads.

This gentleman will fix you up with brass and bullets for your .32 Long Colt.  He also posts here from time to time.

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This might help. Article I wrote for single shot exchange magazine

I have used the same components and equipment as marlinguy but have used plumbers teflon tape wrapped around bullet as lube, not messy, but will have to try lee alox as it sounds fairly easy to use.  Krag

RCBS cowboy dies are great, but so are a number of die sets. I've used regular RCBS for years with no problems.