My cousin reloads and is new to the .223 game. He has a friend selling .222 bullets. I know there are many factors involved so I won't list all the questions/factors. Bottom line- can you load .222 projectiles in .223 brass and have it fire safely and with decent accuracy?
1. What is the actual size of the bullet?
222 rem takes a .224” bullet just like 223 rem and 5.56 NATO
If your bullets your friend has are .222” dia. Since they are not ideal for your use I would not pay much for them.
if they are under 50 grains and are older thin skinned varmint bullets they may not get down range before exploding out of a 1/7 twist barrel
find out exactly what they are
.224” vs .222” dia. Wont beca huge problem they will load and shoot just might not be that accurate. Might get some copper fouling if the bore is worn ,
again buying stuff to buy it is not good. Get them for free or cheap grab them for the day things really get bad