Home Forums Hunting & Shooting Ask The Gunwriters Sectioned Partitions

I understand what you're saying.

My main motivation was comparing the 7mm's. I didn't know if they added "beef" behind, in front of, or equal amounts on either side of the partition. I threw the others in for the heck of it. That 210 was quiet a surprise. Wish I had a 140 7mm to check, also.

Your link has an extra "http://" at the front of it for some reason. If you're copy-n-pasting into a field that already has "http://" then maybe you just need to clear that before pasting your link into that field. Your link looks like this:

http://https//www.24hourcampfire.com/ubbthreads/gallery/80/full/149453.jpg

Got it! Thanks 👍

If you pm your address, I’ll send you a 243-100gr, 257-120gr, and 338-250gr

I may have a 270-150 as well

Sent

I sectioned a couple Sierra bullets many years ago. It's very interesting to see inside them. Thanks for taking the time to post your findings.

Teeder,

Thanks for your post, but I have sectioned a bunch of bullets over the years (including Partitions in diameters up to .416) and have not only found that assumptions about how each will behave after sectioning are often wrong, but also that water-bottle testing isn't nearly as accurate as other "media," especially big game. Can provide plenty of examples if anybody is interested--but one that is that the 200-grain 30 Partition far out-penetrates the 180 .30, even though the partition is in the same place relative to the bullet base.

Also, Nosler has continued to experiment with partition placement in somePartitions, as well as core alloy. Can elaborate on that as well since many are designed to retain far more weight than the 65-70% usually mentioned.

Am assuming, from your comments, that when you section bullets you're measuring the half-thickness. I do it a little differently, putting bullets horizontally in a heavy bench-vise, and then either rasping or grinding them down to nearly half-diameter, then fine-filing and eventually sanding them down to the final thickness, which also results in a more precise view of construction. This is an image of various bullets from Gun Gack III--the lead photo for the section on bullets in the 24hourcampfire questions.

Thanks for your comments, JB. I was hoping you would chime in.

The partition on 270 cal 150g vs 160g look proportionally identical. Based on a sample of 3 elk with the 160g, and 40-50 elk for the 150g, the 160 penetrates further!

John,
It would be great to hear about any info on weight retention, core alloy, and partition position on the NPT's.

For those who do sectioning - do you ever come across any oddities when doing so - like voids in cores, foreign matter in cores, very thin (or thick) places on jackets? Just interested.

MD: What chapter in Gun Gack III? I checked my copy and could not find it. Thanks.

That's a nice job...............I deal with a lot of metallographic related analysis & can appreciate what you did.

I've killed lots of animals up through moose with NPT's and have recovered just a few. I've never been disappointed with their performance.

MM

Here's 3 from a couple of different animals at relatively close & long range. Looks exactly like what they are supposed to.

anyone got a picture of a Berger bullet cut ? that might be interesting,thanks,Pete53

I'll send you a 140 gr 7mm, a 125 gr 6.5 mm, a 225 and 250 gr 35 cal also if you want. PM sent

👍

Sorry, it's actually not a chapter, but the lead photo for the section on bullets in the 24hourcampfire questions--page 335.

Thanks

My 3 Favorite NP bullets that have killed well for me over the years.

28/160, 30/200, 338/250

The 338/250 doesn't really get tested until game weight gets 800-1000 + lbs.
Comparing it to the 30's and 338/210 is not a fair comparison.

Looking forward to seeing that one sectioned.


Dry print is the only way to go for test firing.

That's my experience as well.

Have never recovered a 250-grain .338 Partition on animals up to around 1500 pounds in weight, but have recovered 210s and 225s. In fact, have seen one 210 stay inside a mature but not huge whitetail buck that a companion shot as it ran angling away at maybe 50 yards in timber. Came across the bullet when we skinned it, and he assumed somebody else had wounded the buck previously with a "smaller" Partition. But the buck only had one bullet hole, and the shank of the recovered bullet measured .338."

One 250 did stay inside an animal, a Cape eland. But it landed sideways, due to striking a small thorn-branch a few inches before landing right where I aimed, in the pocket behind the shoulder. In fact the entrance "hole" was a perfect silhouette of a 250-grain Nosler Partition. The bull ran into the neaby thornbush, and we found it in a clearing, still standing but with its head down, after trailing it for about 100 yards. I put another 250 in the chest, and it dropped instantly--but the first bullet was never found in the chest, despite considerable looking. Would have been very interested to see what it looked like!.

MD do you know how many times say the 175 grain 7mm Partition has changed. The obvious switch from the screw machine bullets to impact extruded, but it also seems like the Partition has been moved around, although I may be thinking of in comparison to the 160.

Also are there three generations of Ballistic tips, I believe so if you include the early solid basses?