300 agl sounds like a better outcome to me.
The comment has been made earlier about entry heights and gates, and that it matters not what the entry height was so long as the gate was made. However, those that make this comment do not then comment whether the gate was indeed made.
And if the gate was not made, I would not be surprised if a contributory factor to the gate not being made was the low entry height.
Certainly an entry at 500 ft gives more margin for error if a problem occurs.