I bought some of this - knowing already it was sure functioning, relatively accurate, and very inexpensive - to break in my wife’s Savage 12 BVSS 223rem 10yrs ago. She took one shot at 50, one at 100, then shot a 5 shot group at 100 which measured under 0.2”.
You might imagine I bought thousands of rounds of this thereafter.
The best part - Gander near me used to mis-inventory their 40rnd boxes and sell them at the 20rnd box price. I called it out once and the manager said they ordered 20rnd boxes because that’s all they had SKU set up for, but Rem/UMC mailed the 40’s, charged them for the 20’s, so they just pretended they were 20’s. Cheapest factory ammo which delivered the smallest groups I think I have ever purchased.