5.45X39 is a fine caliber, and way fun to shoot. I just put my SAR-2 through a Kalashnikov Rifle Gunfighting class last October, and ought to pass on some info:
- The best price on 5.45 right now is at
www.rguns.net, but only if you buy a 2160-rd case for $280.00; if you buy at least a case, R-Guns gives you free shipping, so you're down to $0.13/rd. The military 7N6 load they're selling is the infamous "poison-bullet" of Afghanistan fame, but it is corrosively-primed and you need to clean the bore and gas system after shooting to prevent corrosion. The corrosive primers are a requirement for reliable firing and long-term storage in extreme cold(duh, Russia...
). 7N6 has actually fallen out of favor for urban fighting, as 7.62X39 actually penetrates hard cover better - one of my instructors at the AK class is former Spetsnaz, and he mentioned an incident where a 5.45 bullet actually ricocheted off a TV screen during an apartment entry, and killed a noncombatant woman in the apartment.
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www.aimsurplus.com had some Bulgarian 5.45, and now has Polish 5.45; apart from being non-corrosive, I'm assuming it's essentially the same as the Russian 7N6. Should be about $0.15-0.16/rd in case quantities, but AIM isn't giving free shipping. The corrosive Russkie stuff should be fine for practice or even a training class, as long as you clean after shooting.
- Although Wolf and mil-surp 5.45 are available now, if/when stocks run out or are blocked from importation, all us 5.45 shooters are sunk unless Winchester/Federal/Remington, et al. decide to tool up; commercial brass-cased US-manufacture 7.62X39 is now and will probably still be available for quite some time, even though it may cost 3-5X as much as Wolf 7.62 does now. If things get REALLY bad, you've got a better chance of talking someone out of their cached 7.62 ammo than of acquiring 5.45 by almost any means.
That said, if you DO decide to buy 5.45 ammo proactively in case quantities, I say go for it. Apart from the artificial limitations and considerations above, I think the AK-74 "system" has much to recommend it, especially the stripper-clip system and the Bakelite magazines.
If you can only bring yourself to buy your ammo box by box the day before you decide to go blasting, then stick with the 7.62X39 AK.