Yes, these mags should work with your firearm.
The ProMag AR-15 10-Round 5.56 Rollermag Magazine has the same dimensions as the ProMag AR-15 5-Round 5.56mm Rollermag Magazine.
This ProMag AR-15 10-Round 5.56 Rollermag Magazine will not work with 500 Auto Max.
No, these will not work for 350 legend.
Yes, these should work with that lower.
Yes, this magazine will work with a Sig Sauer TREAD in .223.
Yes, this will work with your Bushmaster AR-15 as long as the rifle is chambered in 5.56mm.
Yes, this magazine will work with the Juggernaut JTE-15 in 5.56 NATO.
Yes, this magazine is compatible with .223 ammunition.
While .450 Bushmaster rounds may be able to physically fit in the magazine, that does not mean the magazine will be fully functional with .450 Bushmaster rounds. Instead, I I suggest using a dedicated .450 Bushmaster magazine such as this one: https://www.opticsplanet.com/c-products-defense-cpd-magazine-ar15-450-bush-master-5rd-blackened-s-s.html