Strange .460 Rowland casing question

KeltecFan

KeltecFan

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I shot my first test load of .460 Rowland load yesterday.
The load was a low end load right from the Rowland site.

It shot normally or at least as I expected since it was my first ever.
I would describe it as being something similar to shooting .357 magnum in my Coonan.
I didn't "Chrony" the load.

No obvious extreme pressure signs. A little flattening of the primer. (CCI)

I looked at the extracted casing and saw this. The primer dent is filled with brass.
One photo shows the casing beside a loaded round. The other shows a side view.

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What do you think caused this? I didn't shoot any more because I want an opinion before I do any more.
I'll Chrony the rest. (I've only loaded 5 total so far just to see what they were like)

It looks to me like there may have been some brass filings from the extractor and it got jammed into the primer.
However, that seems a little far fetched.

Thanks in advance.
 

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I would also think over pressure, I've seen that couple of times on range brass. Afaik most primer cups are made from brass and then nickel plated pending the company.
 
Thanks for the replies. I wondered about that and stopped shooting just in case.

I used this data taken from the Rowland site: Hornady 230GN XTP 1.245 OAL with 12.1 GN Power Pistol and CCI LP Primers. (not magnum)
The gun is using a genuine Rowland barrel with comp. on a Norinco 1911 frame. No other modifications.

I have a lot of faith in my scale. It's an AND Fx120i electronic model and I've had predictable results with other loads. (.308 precision loads as well as .45 Auto)
No crimping either.
 
That makes sense about the primers being made of brass. I've heard that a lot of folks throw spent primers into their brass scraps and return them to scrap dealers.
I think I'll pull the rest and load them lighter, Chrony them and go from there. I want a nice hot load but I would prefer to keep the gun intact! :d
 
You can also see the primer has flatten a bit at the edges but not too bad.
That cartridge can run twice the pressure of a 45acp, wow.
Chrno and then maybe try a different primer.
 
Yikes. That is the low load on the Rowland site. 12.5 is the higher load. I'll drop to 11.5.

The recoil spring is the one provided by Rowland. I'm not sure of the weight. The firing pin spring is standard for a Norinco 1911. Primers are CCI 300.
 
Is the firing pin hole in the slide oversize? The lump looks bigger than the nose on most firing pins I've seen....
 
KeltecFan said:
I looked at the extracted casing and saw this. The primer dent is filled with brass.
One photo shows the casing beside a loaded round. The other shows a side view.

View attachment 109198View attachment 109199
Click to expand...

I have a Norc 1911 with a 22 lb recoil spring in which I've fired 230 gr bullets over 11.0 grs of Longshot for 1320 fps (a comparable load to 12.1 grs of Power Pistol), and the fired primers look very much like yours with that load. The side view is most descriptive, as it shows how the primer has flowed into the firing pin hole - very common for those who shoot hot 45 ACP loads (i.e. 45+P, 45 Super, 45-08 and 460 Rowland) in strong 1911's.

There are various remedies if this troubles you:

- employ a larger firing pin; and/or
- bush the firing pin hole; and/or
- use brass with small pistol primers and/or harder "military" primers; and/or
- use a lighter load (lower pressure).

This is worth a read: https://www.canadiangunnutz.com/forum/showthread.php/1187919-Hand-Cannon-NP-30BD-45-08?
 
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