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" BX 25 mag for my Ruger 10/22 is about the same length as the 30 round mag for my AR, why?"
The 22LR magazine is single stack while the 5.56 magazine is staggered.
The 6.8X43mm case is based on the .30 Remington case (base dia - 0.421 inch) so the base is a bit wider than the 5.56X45mm case (base dia - 0.377 inch).
The 6.8X43mm round was developed to push a heavier bullet at a decent velocity out of a carbine built on a standard AR lower. It was also designed to optimize performance out of shorter barrels. It does not loose much velocity out of a 14.5 inch barrel compared to a 20 inch barrel.
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