How old were these bullets. Some of the older Partitions were pretty hard.
I've seen the exact same problem with it's bigger brother, the 175gr Partitions for years back.
Back in the 80's I experienced the same thing with some .277 NPT on Elk. Dime sized hole in and out.
I was under the impression Nosler had softened the front section of the partitions a few years back.
