This should not be construed as legal advice, for that you need to contact a lawyer, but below are quoted 2 sections of Oregon law that seem to answer your question.
In the first quote (166.210) you see under section (2), the definition of a "firearm." This would certainly seem to include black powder guns.
In the second quote (166.250) you can see that felons are denied possession of a "firearm." Since the definition of a "firearm" seems to include black powder and muzzle loaders, it does appear that those are prohibited as well.
It's dumb, but most laws are.

166.210. As used in ORS 166.250 to 166.270, 166.281, 166.291 to 166.295 and 166.410 to 166.470:
(1) "Antique firearm" means:
(a) Any firearm, including any firearm with a matchlock, flintlock, percussion cap or similar type of ignition system, manufactured in or before 1898; and
(b) Any replica of any firearm described in paragraph (a) of this subsection if the replica:
(A) Is not designed or redesigned for using rimfire or conventional centerfire fixed ammunition; or
(B) Uses rimfire or conventional centerfire fixed ammunition that is no longer manufactured in the United States and that is not readily available in the ordinary channels of commercial trade.
(2) "Firearm" means a weapon, by whatever name known, which is designed to expel a projectile by the action of powder and which is readily capable of use as a weapon.

166.250 Unlawful possession of firearms. (1) Except as otherwise provided in this section or ORS 166.260, 166.270, 166.274, 166.291, 166.292 or 166.410 to 166.470, a person commits the crime of unlawful possession of a firearm if the person knowingly:
(a) Carries any firearm concealed upon the person;
(b) Possesses a handgun that is concealed and readily accessible to the person within any vehicle; or
(c) Possesses a firearm and:
(A) Is under 18 years of age;
(B)(i) While a minor, was found to be within the jurisdiction of the juvenile court for having committed an act which, if committed by an adult, would constitute a felony or a misdemeanor involving violence, as defined in ORS 166.470; and
(ii) Was discharged from the jurisdiction of the juvenile court within four years prior to being charged under this section;
(C) Has been convicted of a felony or found guilty, except for insanity under ORS 161.295, of a felony ; D) Was committed to the Department of Human Services under ORS 426.130; or
(E) Was found to be mentally ill and subject to an order under ORS 426.130 that the person be prohibited from purchasing or possessing a firearm as a result of that mental illness.

There are NO background checks for guns you already own. You can bring any conventional gun into Oregon with no hassle and no paperwork. (If you own machine guns please contact us for more info.)

If you buy a gun from a federally licensed dealer, there will be the standard federal background check done through the police state police. The police state police will keep a record of your purchase as long as they can. Oregon law says they can keep the info for 5 years. (If you think they'll destroy the info after 5 years we have bridge we'd like to sell you.)

If you buy a gun at a gun show, the geniuses who vote in Oregon have decided that you must also pass a background check even if you are buying from a private collector. Of course, nothing prevents you from finding a gun you want to buy from a collector at a gun show and making the actual purchase across the street at McDonalds. Oregon gun laws were written by and for idiots.

If you look at subsection “d” you'll see it appears before fB. It stands alone. License holders are exempt. Obviously this only applies to public schools. Private schools may do as they wish.

Oregon has no banned weapons. If you want to buy a machine gun, silencer or what BATF calls “any other weapon” (meaning non conventional firearms) you need Federal approval as well as the approval of your local chief of police. But other than that you can buy and own whatever you want.

Private property is private property.

The owner of the property can make it a condition of access that you dress only in plaid or wear a bunny suit. (Fortunately, this happens with relative infrequency.)

Thus, a restaurant, home or private hospital CAN tell you you are not allowed in with a firearm.

This, however, then becomes a trespass issue, meaning if you DO go somewhere private with a gun, they can ask you to leave. If you don't, you are trespassing.

There is nothing else in the law dealing with this issue.

That being said, don't fall for all the other lies you may be told about where you may and may not be with a gun.

For example, you cannot be barred from any school or school grounds, no matter what anyone tells you.

You can be barred from courts, but you're free to wander the halls of the Capitol with your (permitted) firearm beneath your coat.

In fact, there is some indication that you are not even barred from the Post Office if you are there for a "lawful purpose." (Consult your attorney.)

As you know, every dirt bag bureaucrat and his brother is trying to institute restrictions on carry.

That's why we're suing the city of Portland and have already gotten the State Fair to back down on their "no guns" policy. Expect more of this crap in the future.

As far as the private property is concerned, we (not being lawyers) would NEVER suggest you do anything that would upset the property owner.

We also would point out that you would probably feel REALLY, REALLY stupid if your gun was in the car when you needed it and why would anyone KNOW you had a gun if you didn't tell them?

We introduced this legislation in '97 and '99.

In '97 we were OPPOSED by NRA and "Oregon Gun Owners." Our bill
got a hearing and a vote in committee where it died on a 3 to 3 vote.

In '99 the "Gun Lobby" (having been beaten deaf dumb and blind by us) did not openly oppose the bill, but Kevin Mannix, who was in charge of the relevant committee, killed it.

What needs to happen is simply to find a legislator who will sponsor the bill and then go through the very ugly process of forcing a vote in committee.

Lars forwarded your note to me.

If you are an Oregon resident and meet the statutory requirements for a concealed handgun license, the sheriff must, in most cases, issue a license.

However, if you are not a resident the sheriffs have total discretion to approve or deny.

The law also requires that you have a "compelling business interest" in Oregon.

In other words, if you're not sleeping with the sheriff, forget it.

However, any county can issue the license, so your friend might well be successful by applying in a county not totally controlled by anti-rights radicals.

May I suggest starting in Douglas County.

The continued abuses and errors on the part of sheriff's around Oregon never stops amazing me.

I would very much like a hard copy of the notice you received from the sheriff. If it's not too much trouble, by mail at box 556 Canby OR 97013 or fax at 503-263-3708.

NOTHING in Oregon law restricts carry in schools by license holders.

This is just a flat out falsehood. If that law existed we would not have had the ugly fight we did in the last session when they tried, and failed, to pass just such a law.

As for a the Federal law, you know, I just wish these clowns could, or would, read.

Federal law DOES prohibit guns on school property. BUT, it again, specifically exempts license holders.

As for private property, my house is private property. Are you banned here?

The only time you're banned is if the property that is posted specifically bans concealed carry, as we are seeing with more and more hospitals. I'm not even sure that's legal because I don't know which hospitals are truly "private" property.

As you know, we're fighting several different abuses around the state but I'd be happy to add your sheriff to the list if I can get the documentation.

This is true if your are a “legal resident alien.” Otherwise it's another crock. Once again what we are facing are law enforcement agents who cannot read the law. Here's what it says:

166.291 Issuance of concealed handgun license; application; fees; liability. (1) The sheriff of a county, upon a person’s application for an Oregon concealed handgun license, upon receipt of the appropriate fees and after compliance with the procedures set out in this section, shall issue the person a concealed handgun license if the person:

(a)(A) Is a citizen of the United States; or

(B) Is a legal resident alien who can document continuous residency in the county for at least six months and has declared in writing to the Immigration and Naturalization Service the intent to acquire citizenship status and can present proof of the written declaration to the sheriff at the time of application for the license;

Ok, that’s A and B. Two different things. Oddly when they first wrote this section they didn’t make that distinction. We complained and said this would be mistakenly applied to US Citizens. Typically, the “gun lobby” disagreed. Fortunately, the committee hearing the bill agreed with us and made it as clear as they could. But still these boneheads can’t get it right.

We have gotten Marion County to back down on this. We’ll go after the others one at a time.