When you pull it back, does the hub stil rotate freely? If not, then it is the shoes dragging, or there is a ridge on the inside of the drum. Lynn's advise should work.
If you pull it back to the point of sticking, and the drum will still turn freely, then you problem is either a nick or slight corrosion on the spindle or a cocked bearing. Push the drum back in, with a brass drift gently tap the outer bearing back in and try again. If the outer bearing is already off, then most it may be that you are cocking the hub as you remove it.
For the nick or the cocked bearing, and even for the shes if it isn't too tight, a little more force is fine.
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