In excess of 2 miles.
Between $100 and $150, depending on if it has a heavy varmint barrel or not.
1 in 12"
1/9? Well, maybe. Most of these rifles were made with a 1 in 12" twist. This twist was judged best for the lighter varmint bullets (40-52 gr). Some newer .223 rifles are offered with 1-9" twists. Its best to check the rifle to make sure which one it is to be certain.
Browning,s home page should contain this info.
The max range for .223 is about 300 yards.
@ 450m
1000m
Neptune has a temperature range is -223° C to -220° C.
The H&R Handi-Rifle varmint barrels in .223 made before the year 2000 typically have a rate of twist of 1:12. This slower twist rate is generally suitable for stabilizing lighter bullets, typically in the 40 to 55 grain range. Later models and variations may have different twist rates, so it's always good to check specific models for confirmation.
500-800 meters depending on the target engaged.
Both do what they are supposed to within their range limitations.
Class B - 128 - 191