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If your house is hot enough to set off ammo, I doubt you'd be alive for long anyways. The auto-ignition point is over 500 degrees F for almost all powders, even the crappiest stuff ever invented probably won't ignite under 200 degrees F. So that means you just have to avoid crushing it (i.e. hammer) or hitting the primer hard with a pointed object. If you don't have kids then just don't keep them in the oven or blender and your probably alright. If you do have kids or your really anal, mount them in a shadowbox if you want them displayed or just store them anywhere your kids can't reach. Ammo by itself is pretty damn safe... a kitchen knife is much more dangerous. If you have money burning a hole in your pocket and your extremely paranoid you can have somebody empty the powder, dud the primer and reassemble it, or buy a pre-dudded round off ebay (the only kind they sale).
As for what ammo they are the most common military rounds near that size are .308 (7.62mm Nato) and 7.62x54R but depending on where you got them and how old they are your dimensions could make them almost anything. 2-5/8" (66mm) is too long to be 7.62x39 or .223. The best way to identify them is to measure properly. The best way to identify it is to measure it correctly. Measure it as AxB where A is the diameter of the bullet (in mm) where it enters the casing. B is the length of the casing from rim to neck (not including the bullet length). Make the measurements as accurate as possible to the closest 1/16" (<2mm), also the writing (if any) on the rim of the case.
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Whoever appeals to the law against his fellow man is either a fool or a coward.
Whoever cannot take care of himself without that law is both.
For a wounded man shall say to his assailant, "If I live I will kill you, if I die you are forgiven".
Such is the Rule of Honor.
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