I have this Savage No.4 two groove 303Brit sporter. It is in line for a 257 Roberts barrel sometime in the future but for now I am interested in shortening the barrel, fitting a short overhang, over-barrel suppressor (maybe two baffles). The bore has visible rust damage. How short should I go? What kind of accuracy can I expect? (Given that the two groove barrel is not supposed to be that accurate to start with). Will lapping the bore before shortening help with accuracy? What bullets and loading would suite a shorter barrelled 303Brit. I was thinking of loading 150gr bullets to about 2400 fps so as to burn the powder inside the barrel. I don't mind lower velocity with heavier bullets but was thinking of those slightly longer shots that might present. The motivation is the carry of this gun in the deep woods, where my longer barrelled guns hook up all the time. Shoulder carry is the only option as I need both hands free.

Thanks in advance.