Per a Facebook post from Savage Arms:

Quote Originally Posted by Savage Arms on FB
Attention Savage MSR 15 Valkyrie and MSR 15 Recon LRP Owners:

We've heard from many of you who are thrilled with the performance of your MSR and the ground-breaking 224 Valkyrie ammo. However, if you have seen performance issues, we encourage you to refrain from using the 224 Valkyrie Sierra 90-grain MatchKing rounds at this time per the announcement from Federal Premium (link below). We have tested the other factory loaded offerings and are confident in the accuracy from our barrels with all other 224 Valkyrie ammo options available to you.

If you ever experience issues or have concerns about your firearm, please contact our Technical Services Team at (800) 370-0708. We are always here to help!
Link to Federal Premium Press Release: https://bit.ly/2m3jipy