Yeah, I did some testing in water jugs and the Speer was right behind the 300 Partition. I still have a couple 100 of them 300 .458 Partitions but haven’t tried them yet in the 458. I’d bet those would shock folks how well they penetrate. They’re a demon in the 45-70. I used the Speer to work up loads and match them to Partition to save what I did have.
I’d bet you could put a round ball in the 458 and it might even be a little lighter and a decent little plinker too.
