choke current rating

[NR5P]

I'm building an amp with a single gi-7b.  I've got a huge choke 20 henries,  15kv, 150 ohm, .3amps, are the specs, I would think it weighs something like 75lbs.  The .3 amps is the max current rating currect?  I was wanting to use it for a choke input for the amp and noticed the current rating on the side.

[WA1GFZ]

At 150 ohms DC I would think it is rated for 300 ma. You could push it some maybe .5 A peak but there will be a 75 volt drop across the choke