I can tell. Varget is my go to for 308 handloads. I just got numerous boxes of Sierra GameKings in, in 30 caliber and 338 caliber.
I don't go through lots of cartridges, I build a load ladder, get the accuracy where I want it and then the only time I shoot the rifle (or pistol) is competition, I shoot pistol competition or hunting with a long gun.
For a while I thought Sierra was not going to produce anymore projectiles, they got scarce before the big panic.
I just went to the Top Brass/Sarch website and they have suspended all sales until further notice. I have pending orders there as well for extremely large quantities of Top Brass (Starline) in 308 and 223. I really like Sarch for quality plus they come pre sized to Sammi specification and I can specify the brand of primer I want inserted. Makes life less complicated. All I have to do is check a couple for dimension and load the propellant and seat the projectile. I've never gotten anything but quality primed brass from them, ever.
I don't shoot 223 but I load themn for friends.
It will get better. I don't believe it could get any worse. At least the muzzleloader stuff didn't vanish. No issues with Blackhorn 209, WhiteHots, CCI 209 primers (just got a thousand) Sabots or non-saboted FMJ's.
Was talking to another muzzleloader the other day. He said the reason was because most people don't understand front loading a rifle. Might be true. No problem with me, in fact, I prefer a muzzleloader. More fun, less cost.