So in what caliber do you use themand what do you set you col at? Thank you.We are really brainwashed (or maybe we brainwashed ourselves) on weight retention. 100% is necessary in some circumstances, but not in many. The 60% to 70% works for me and kills quicker for me than 100% bonded.
The partition is placed where it is for well thought out reasons. The further forward it is, the less weight is shed, the smaller the mushroom , the deeper the penetration, and, in small animals for the calibre, the slower the kill.
The only thing that I have found, is that to get maximum accuracy, I sometimes have to jump them a little more than some others.
@rookhawkI was gearing up for Africa and found these old mementos from last summer to share with you. Other people were asking about some of this info but I felt bringing it up in their threads would become a distraction from the conversation.
I'm a 7x57mm lover, a heavy bullet for caliber lover, and an impact at 1900-2400fps for proper controlled expansion and energy transfer fan. Thus, I've had very good luck with Nosler Partition 175gr projectiles.
The picture is of a retrieved bullet from an Ontario black bear and a Greater Kudu from last June and August. As you'll note, they worked very well. I also had no defects, bolt-of-lighting efficacy on Warthog, 9 impala, 2 baboons, steinbok, and a few other animals in the past 12 months.
I share this info because I had to find out for myself why I've had such great luck and others have had such bad luck with Partitions over the years. (jacket separation, total franging, etc.) I don't believe it is luck and I don't believe the complainers are liars so I did a lot of research and some interviews on this topic. After speaking with some of the top commercial/custom loaders in the business, this is the working theory:
Bullets less than 150-160 grains and in diameters less than 7mm / .284 seem to be group A that has occasional problems with partitions.
Bullets of 7mm and greater fired from guns in the 2600-3200 fps range with high twist rates seem to be the group B that has problems.
The experts believe that the centrifugal force of the Partition at high speeds and high rotations is dislodging the jacket from the core during firing OR during initial impact resulting in these problems. They believe the .22-25 caliber partitions have too little core area to adhere the jacket too properly and the bonding fails.
For what it's worth, I'd not hesitate to use partitions in 7x57, 30-06, 35 whelen and the other calibers that push bullets at that ideal 1900-2400 fps impact velocity. The stories of bullet malfunctions appear to not apply to these calibers/velocities.
View attachment 153798
John Nosler designed them to be better than the standard cup and core. This he did very well for cartridges of the time. They worked well with this cartridges like the 30 ought six and 150grain 270s,257 Roberts and others in the sub 2,900 fps. They were not designed for the magnum craze and experienced failures at the higher speeds. Kept within the original velocity parameters they did what they were supposed to do.
@sheephunterabLet's not forget that the Partition in 1946 technology. It shouldn't come as a big surprise that jacket separation and excessive fragmentation happens with very high velocity hits. The bulk of these high velocity chamberings didn't exist in 1946. The bullet was designed for low-medium velocity hits. Each bullet has their own performance envelope and many of the new magnum chamberings fall outside that envelope for the Partition. Use a bullet for what it was designed and expect good performance.....stray outside that performance envelope and expect less than ideal performance.
308 (150,165), 30.06 (180) and 7x65R64 (160)So in what caliber do you use themand what do you set you col at? Thank you.