They sound like awesome calibres and would surely do the job.
I do need to try and keep the overall size of the handgun down or else I most likely won't have it with me when /if I need it.
It needs to be small and light enough that I wear the thing all the time I'm out hunting.
I'm putting the cart before the horse here because first of all I need to apply for the licence and it seems unlikely that they will grant me one.
I did enquire about a permit once before (about 1995) and they did agree that I had a "genuine need", but they also said that there would only be a slim chance that a licence for my needs would be granted.
I will make some enquiries and keep you posted.