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How to load 12 gn of N105...

3K views 14 replies 6 participants last post by  Benchrst 
#1 ·
Hi,
I read some threads here with loading data of more than 11gn of N105 and a 180gn bullet. The maximum of powder which I can get into my Starline brass without compressing it is quite exactly 10gn, with a Frontier FMJ 180gn bullet.
 
#7 ·
I just posted on the other thread. My favorite N105 load under a 180gr jacketed bullet, loaded to 1.260" is 12.4gr. There is a little crunching going on when you are seating a 180gr slug to that OAL.

I have never had any problem compressing any powder, pistol or rifle. I suppose if you are using a large flake powder an argument might be made that crushing it might have the effect of increasing burn rate, but given 800x was developed for game loads in shotgun and the fact that you compress every charge by definition in a shot shell, again, not seeing and real world results for what I consider pretty fanciful thinking.

This is an over book load, so it is not the area for beginners. If you are just starting out, stick with Longshot and book data, you will be getting plenty of what people come to 10mm for with max LS loads.
 
#12 ·
For anyone puzzled by my 12+ grain load of N105 when the max book is much lower, pretty much everyone who has worked up their own loads with N105 in 10mm has concluded the Lapua load data is hopelessly off. If you doubt this assertion, take a look at your chronograph when you shoot that 10gr of N105 under that 180gr slug, it will be way slower than what Lapua says it is supposed to be.

I have heard a number of theories on how they could have been off by as much as 20+%, simple things like just a clip and drop mistake on the ballistician's Excel spreadsheet, to more complex ideas like they used QL and the person running the keyboard didn't know QL.

In any case, the numbers are really wrong. So I, like so many others before me, painstakingly worked up my data. N105 will get my 180 jacketed slugs going 1300 fps out of my stock G20 barrel and will do that with zero muzzle flash and no smiled cases. In 10mm, like #9, N105 is slightly too slow and bulky to get enough in the case to break anything. Like AA #9, it is one sweet 10mm powder for the heavies.
 
#14 · (Edited)
Willy

Completely agree VV data is a bit wonkers, it's just my own expansion results are telling me it's getting close to stopping time.

I'll ladder up a bit - heck, maybe #s keep growing and case expansion doesn't :)
Every gun is different, so mind your gut and instincts as well. They aren't handing out medals for going beyond what feels right to you and the gun you are running. ;)

PS - This is N105 and 10mm specific intel. The 3N37 data I use of theirs in 9mm Parabellum is pretty accurate. I do run my SD Gold Dot loads over their max book, but we are talking tenths of grains, not grains. :)
 
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