I read somewhere that you cannot hunt with semi auto weapons. Is that true?

I have a Rem. .243 semi and Rem. 1100 12 ga.. If what I read is true then I don't think I can hunt deer in the state. I also read that it is flintlock only for muzzleloader.

No semis for deer hunting.
Early muzzleloader is open to basically any front stuffers. Late season, after Xmas is flintlock only.

I think he could use the shotgun,couldn't he?

Semi shotguns are legal for small game.

I also believe semi shotguns are legal for deer in Allegheny Co. only.

This is true.

That must be the reason that the only guy I know who uses a semi lives in Pittsburgh.I wonder what the rational for that law is?

To kill more deer?

I just want to add early muzzleloader is for doe only. but does anyone know if you can use them in the rifle season?

No semi-autos at all.

Semi-autoshotguns only when used for small game, fur bearer, turkey or unprotected birds.
(didn't find a rider saying whether or not they were legal for deer, so I would have to say assume no. though you can write or email the PA Game Commission to check.)

Flintlock-only during the main/regular season which is just after Christmass. During the early season you can use any muzzleloader, flint, percussion or inline, that fits in the minimum/maximum regs for the season.

muzzleloader in rifle season?
Yes, any one you want to as long as it's 45cal or larger.
Flint, perc or inline.