There is no shortage of nitroglycerine or any other ammo component.
The shortage of ammunition and reloading components is being driven by the gun show promoters, scalpers, online retailers, mom and pop guns shops and others who have a vested interest in keeping prices high. The far outers on the web are making up lies and distorting the truth in order to stir up uninformed gunowners.
Yep, 20 years ago i bought into the "Clinton is going to stop the sale of small arms primers for reloading". Swallowed it hook, line and sinker. Hoarded up tens of thousands of primers. Still have thousands of primers that i seldom use.
There is a major retailer of reloading components here in OK who can't ship his powder out fast enough. The Fedex truck is limited to 700 pounds of powder per pickup.