Just what IS a musket?

I think you're right - a smoothbore, which if rifled, becomes a rifled musket. Note the thin walls of the bbl compared to a rifle of the time. The Win 95 musket is an anomaly, named probably for the long bbl and full length forend. They had marketing dudes back in 1895, too. BTW - those guns were used by the Russians and Turks as military weapons, iirc. So musket may indicate the military version. JMTC, YMMV, ETC.

The 1873s with full-length forestocks were also referred to as "muskets". I agree it is not in keeping with the typical usage of the word. Muskets are smooth-bore long guns firing a single projectile. But those Winchester "muskets" are sure fine looking weapons.

A musket is smooth bored. Less accurate but faster to ram the load down for volley fire in ranks the way they used to fight wars.

A rifled musket has a short section of rifling to increase accuracy without adding too much to load time.

Rifle is a long arm with a fully rifled barrel.

All black powder guns had thinner barrels because of the lower pressures BP operates at.

Some modern rifles are called muskets because of their styling (usually long barrels and full stocks to muzzles).

I read somewhere that the British named their new rifled, Minié ball shooting muzzle loaders (such as the Enfield mentioned above) "rifled muskets" because if they had called them "rifles", the men carrying them would have wanted to call themselves "riflemen" - as opposed to regular infantrymen. And one couldn't very well have that happen. Riflemen in the British army were after all better paid than regular infantry, and they had bean counters in the 19th century too.

I don't remember where I read it, so you may take it with a grain of salt. But knowing how the military (any military, any time period) works, it sounds at least plausible.

"...rifled musket has a short section of rifling..." Nope. The whole barrel is rifled. A rifled musket looks like the older smoothbore, but has a rifled barrel. Generally using a Minie ball instead of a round ball. The Minie ball is under the bore size to make loading quick and has a hollow base that expands upon firing to seal the bore and engage the rifling.
The Winchester model 1895 "musket" was a special order for the Russian government in 7.62 X 54 Russian to be issued to their troopies in W.W .I. Full stocked with a bayonet lug. Having a full stock protected the barrel when bayonet fighting. Now, it's just a marketing thing.

Here ya go:

Oh, you didn't say Muskrat?

mus·ket
n. : 1)A smoothbore shoulder gun used from the late 16th through the 18th century.
2)n : a muzzle-loading shoulder gun with a long barrel; formerly used by infantrymen
I guess it is a fairly generic term, as it described with, and without rifling.

I just remembered reading that the German infantrymen were called musketeers in WWI and they were armed with M98 Mausers. !!

Webster's says "...broadly:[/I] a shoulder gun carried by infantry."

That most general definition seems to be consistent with the use of the word throughout history. The term "rifle" by itself does not necessarily indicate a shoulder fired weapon, as I believe many artillery pieces have been known as rifles.

I would argue that M1 Garands, M14s, M16s, etc. are all modern rifled muskets.

I would go along with that, Dread.