I want the pro's and con's of all of them.
Anything you can think of!
Alright, here's the order I would put the three in:
1. Enfield : As I said before, I prefer the No.4 Mk.I. The Jungle Carbines are cool, but IMO, not worth the drastic rise in recoil. The full size No. 4 is a finely balanced and quick handling rifle.
Advantages:
-Fastest, Smoothest Bolt Action
-10 round magazine capacity
-excellent sights (especially the earlier pre * models with the micrometer rear peep)
-very accurate
-cheap (can still be found quite cheaply, expect to pay less than $300 for a decent example. Sporterized versions can be had for much less)
-extremely rugged. They've been carried all over the world, under any condition imaginable, and never failed to get the job done
Disadvantages:
-Hard to find ammo
-Hard to mount optics
2. Marlin 336: Levers are fun. I have several, though mine are all Winchester 94s. It's lighter and easier to handle than the Enfield, but doesn't pack nearly the punch.
Advantages:
-Quick handling, fast firing
-Decent Magazine Capacity
-Easy to find for a relatively low price
-Cheap, easy to find ammunition
-Easy to scope if you so choose.
Disadvantages:
-Relatively low power (.30-30). Limited to a maximum effective range of about 200 yds.
-Not as rugged as the bolt action, but should do very well as long as its properly cleaned and maintained
-Can jam if you don't do your part working the lever properly.
3. Mosin Nagant: Would be a distant third for me. Personally, I would much rather have a Mauser, even over a Finn M39.
Advantages:
-Rugged, built for peasants to operate with little or no training
-Powerful round, on par with the .303 British
-Easier to find ammo for than .303, not as easy as .30-30.
-You already have one, thus, you're quite familiar with its operation.
Disadvantages:
-Clunky action, by far the slowest of the three to operate.
-Accuracy issues. Finns are accurate, most others are hit and miss (with emphasis on the miss for many)
-Lowest magazine capacity of the three
-Worst handling characteristics of the three. May be more personal choice, but I don't like the shape of the stock or the balance of the rifle. Finns are better in this regard, but still no Enfield.
-You already have one, thus, you might want to try something different and broaden your horizons. Having two rifles in different calibers can also make it easier to find ammo when supplies are tough. You have twice the chance of actually finding something on the shelves that you can shoot.
That's my recommendation. I don't own a Nagant, and have never had a burning desire to get one other than the Finn M39. My Swedish M96 cured me of that.
I would be leery of the pump 760. They are rapid firing, but they are no where near the level of ruggedness of the others suggested. If you think a lever is going to have problems operating under adverse conditions, there's a lot more cheap easy to break parts in that pump than in a 336. I've never particularly liked the 740s, 760s, or their variants. It's a deer hunting weapon, not something for a SHTF scenario unless that's all you can get ahold of.
