Lever action 30-30, 35 Rem, 444 or 45-70 etc with open sights. Possibly a receiver sight (peep). Red dot would work too. If you have Weaver bases on your rifle, remove the scope and put on a red dot like a Bushnell TRS 25 or Vortex Sparc. Quick release rings on your scope will make the transition easier.
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"I would not be an old man if I had not been an armed young man." JTJ
I was taught to respect my elders but they are getting harder to find.