When you said not a semi-auto, that put serious limitations on things. There are a lot of good rifles that can be of use, it's just that for me, I prefer a semi-auto in a defensive role due to their quicker firing, and the fact that they generally feed from removable box magazines for faster reloading.
That said... Lever gun or bolt gun is what you have left. I have a few options I have that can be pressed into defensive roles. In fact a couple of them, are just that, defensive rifles, in non-semi-auto form.
1. Lever action. My combat cowboy carbine is a Rossi 92 with a 17" heavy octagon barrel, red dot, and light. It's in .44 magnum because I only had it done up as a home defense / camp gun, but you could do one in 30/30 if you need the longer range capability. Mine is plenty powerful for the 100 yds or so I intend to use it, and the shorter rounds allow for more magazine capacity. My most fun gun to shoot anyway... Nothing within 100 yds survives this gun.
2. In the bolt gun category there are so may to chose from it's not even funny...
Maybe a lightweight little .223 like this 16.5" Weatherby Vanguard series II. I could carry this thing forever, and not get tired. It's very accurate.
A scout rifle is a good all round choice. This one is a 100+ year old Spanish Mauser carbine in 7x57. Had the barrel cut to 18" so it sits just in front of the barrel band to give it that Mannlicher look. The 7mm Mauser is a very capable, yet pretty soft shooting cartridge.
Probably (OK, without a doubt) my most effective non-semi-auto (if not my most effective overall) defensive / combat rifle is my Lee Enfield No4 Mk1. The .303 British is a very potent round, and this rifle holds 10 of them (stripper clip fed) in the fastest bolt action ever devised. I shortened it to 16.5" making it just a bit lighter (still pretty hefty) and somewhat handier. It's the red dot, however, that makes the difference. Like the one on the Rossi, the red dot makes it SO MUCH faster for target acquisition. (still has irons for back up)
Yes... I like taking photos of guns on that bolder. It's the nicest looking spot.
It's called "Princess Rock". It's where my favorite dog was buried 8 yeas ago.
She helped raise my kids for 16 years.