.300 Remington Ultra Magnum vs .300 Norma Magnum

No, this is not a "Which caliber is better thread".

I'd like to understand the differences between these two calibers.

I understand that the .300 Norma Magnum is a necked down .338 Lapua Magnum (to 7.62).

It looks very similar to the .30-338 Lapua & the .300 Lapua Magnum (on paper).

My question is, how is the .300 Norma Magnum able to shoot a faster .30 (7.62) caliber bullet (compared to the RUM) with a shorter case capacity?

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.300 Remington Ultra Magnum vs .300 Norma Magnum