Snap Ring holding axle in place

With "Strange" axles, and a snap ring.
You likely have "green bearings", the snap ring is to stop the bearing/axle going in too far.
With the axle bolts undone, give the axles a tug, and they should pop right out.
If not, invert the drum, bell out, slide it onto the axle studs, put on 2 or 3 lug nuts a few turns, push the drum in, and tug it out, as a slide hammer, a few tugs should bring the axle with it.
Cheers