I'm switching to Partitions! lightbulb
Nosler Partitions are as reliable as any bullet ever commercially manufactured. Many other controlled expansion bullets have been manufactured since the Nosler Partition in the effort to match/exceed Partition performance. It may not look as snazzy/flashy as some of the newer controlled expansion bullets, but its performance is very reliable and consistent. I've never heard or read of anyone saying they had a Nosler Partition fail to expand. Most of my experience with them has been in .338s - 210gr spitzer and 250gr round nose on Alaskan moose.
The farthest I ever shot a large game animal with a Nosler Partition was at a distance of 760yds, shooting a 250gr round nose fired from a .338 Win Mag. This was close to 30 years ago. As you can imagine, there was some Kentucky windage involved in that first round hit. Hit the moose in the ribs standing broadside, and the Partition expanded even at that reduced impact velocity. Recovered the bullet against the hide on the off side of the bull. Bull bolted about 35yds, stood still for 60 seconds, and then fell over. The Partition expands and penetrates very reliably, almost to the point of being monotonous / boring. It's a nice blend of controlled energy release and penetration.
If you want less energy released so quickly upon impact, and higher weight retention & deeper penetration than the Nosler Partition - then use a Swift A-Frame which is similar to the Partition. The lead core in the nose of the Swift A-frame is bonded to the jacket yielding ~90% weight retention, compared to ~55% weight retention for the Partitions.
The Partition and A-Frames are both excellent controlled expansion bullets for use at close to medium ranges. They lack the BC value for retaining velocity and cutting through the wind at the longer ranges.
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