Indiana's General Assembly passed and Governor Pence signed into law House Bill 1231. Effective 1 July the 10 mm will be a legal handgun deer cartridge. Also, deer rifles in .243,.30/30,.308, .30/06 and .300(not specified) will be legal. They have been legal deer pistol cartridges for many years. Lord willing, this year I will kill a deer with a rifle. A new .243 is calling my name.