The reply I received from the Remington Company about my question wondering if they might be willing to make another run of the .22 Remington "Jet" Magnum ammo or bullets:

"<span class="ev_code_RED">Sorry, no. If what we've been making for the last 60 years isn't good enough anymore we'll go ahead and drop it because we could sure use the production time.</span>"

Seems that they are too busy to be bothered.