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The general concensus in a previous thread on the topic was that it would be too aggressive for the shallow micro-groove rifling typical in NEF/H&R bores, using the finer grits may be ok, but polishing with JB Bore compound or Flitz would be a much better alternative to just shooting it with conventional bullets than the Tubbs for break-in.

Tim
 

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Just a Tidbit I found that may be helpfull :)

Some people say that the finish in the barrel is important and the better the finish, the better the barrel. What seems to be true is that if the finish is too good, less than 10 microinch roughness, then metal fouling tends to become a problem. It seems that in a "rough" barrel, the bullet rides on the high spots and so there is relatively little friction. But the smoother the barrel gets then the greater the surface contact with the bullet. The friction goes up and more bullet jacket gets left behind. Of course, if the barrel is too rough, then this just picks up metal and acts like sandpaper on the bullet. But there is a band of surface roughness where metal fouling is minimised which is between 10 and 20 microinches.
 
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