Jacko ,
Just my personal feeling on it .... I own a 45 LC in a lever and have owned more then one 44 mag ... And i too hunt those awnry critters we call wild pigs here in the states .
If you are not set up for reloading at this moment in time i would recommend the 44 ..
Like you already stated the availablity of good power from factory ammo is already there for you , And should you at a later date decide to get into reloading the 44 is a straight forward cartridge to learn to do so with ..
As for the H&R/NEF rifle versus the Rossi ... and im guessing the Pomba is a refference to thier lever action known here in the states as the Puma ... I would say thats a purely personal preference type choice brother ... Like i mentioned i have the H&R singles, and I like them just fine .. And i own lever action rifles as well and they are great ... I would say HOW you like to hunt those pigs is the most key thing to answer your question right..
If you hunt from a stand or a box blind then the single shot will serve you well ... Now if you are like me and like to get into the thick stuff with these beasts then you may be better off with a lever , Giving that you can quickly rechamber and fire in a hurry ..
Now if the Pomba is the single shot Rossi like they have here in the states then i would say stay with the H&R just for the extra accessories etc. that are available for it ..
And as far as accuracy goes the new H&Rs have changed their bore diameter and that has seemed to fix alot of the accuracy issues that that caliber once had, For the 44 that is.
I for one have never had bad or horrible accuracy out of these H&R rifles .. And have only owned one Rossi single though my brothers wife has one too .. And accuracy hasnt been an issuse with either
Sure do hope this helps you out a little Jacko,
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And by the way , Welcome to the forums