I use all copper, my choice. I've been loading the Barnes bullets for deer for several years in 30.06. They are great in the .06, but, as was stated earlier, some rifles don't have the twist rate for them. That could lead to some testing different bullet weights to get one that works, and that could get pricey and even to the point of not being able to find the ammo to figure it out. This isn't the time for this. Bullets are in demand and scarce in some cases. If they plan on doing this it could lead to a bigger lack of hunters in the field. You can't shoot if you don't have ammo!