Even if you don't have the steel cases crack, they will wear out your nice dies, dies that cost you good money to buy. You won't be saving much when you wear out parts that will otherwise never ever wear out ever with brass. They are made for a certain material, a metal alloy that even among its own type is mixed and designed to be drawn, perfect for its intended purpose, for case making.
Also consider that not all cases are the same, 7.62mm NATO is a great example, there are minute differences between 7.62mm NATO and .308 Winchester, then there is military brass that is thicker and heavier that has less internal dimensions because the walls take up more space and you have to know this because they have to be loaded lighter or else get overpressure. Your steel case might not only be dimensionaly similar to brass on the outside, what is its actual internal capacity? Use standard brass case loads in steel you might be OK, or you might be pushing the envelope.
Buy some good brass for 8mm Mauser, get good Norma brass, if you shoot one rifle only in that caliber consider a neck sizing die instead of full length resizing. Take good care of it, use your equipment well, and if you want shoot lighter loads at lower pressures to extend case life, and you will get your money's worth out of them. Buy some cheap ass PPU brass case Mauser ammo and shoot it up, its damn good brass, and you even get a loaded shell out of the initial cost.
As for 7.62x39, same thing, reload brass or nothing. If you can't do it cheaper than factory ammo, which is highly likely, just don't if you shoot it because its cheap. If you want high quality eat the higher costs for the higher quality product. Either or, no real middle ground.
As for general reloading, buy good equipment, buy good OFFICIAL books form the big boy book producers, don't get too fucking smart for your own good, follow directions, be particular, keep your weights and measurements exact, keep tolerances close, don't be sloppy, don't get creative, follow directions, don't get creative, remember that MAXIMUM loads mean MAXIMUM loads not "keep going till you blow your face off", don't get creative and follow directions and powder weights and OAL carefully and approach maximum pressure with caution. Don't get too creative.
Start with a single stage press and learn the basics, don't jump into a big setup. Buy good stuff, get an old fashioned powder measure to go along with any digital measure you use so you can make sure your digital scale is dead on, never hurts to use both scales to make sure you aren't doing anything wrong. You can't be too careful. And don't get creative.
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