I do not keep a strict inventory per se. After years of reloading, I have enough components to get me through.
When the price is right, I buy primers by the 5k or so.
Once a year or so, I place an order with Missouri Bullet. Depending on how much I shot last year (or what caliber adjustments I have made this year) , and what disposable income I have this year, dictates my order.
Powder, likewise. If I find a good price, I stock up.
Honestly, I may not live long enough to shoot up all of my components. But I attempt to replenish them when practical.
My shooting is not dictated by my ability to buy, but by my judgement regarding my current supplies...and biased by the current market availabiltiy/prices.
Going to the Gun Show this weekend. Not looking for anything specifically, but always looking for something I can't resist.