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 Post subject: barrel pressure range reloading 410 for old Winchester M42
PostPosted: Tue Sep 29, 2020 2:52 am 
Utility Grade

Joined: Thu Apr 30, 2020 4:38 pm
Posts: 12
Hello, all.

I am embarking on reloading 410 for my Winchester M42 made in 1947. I want to ask the group what is the safe, acceptable range of pressure for reloading. If it matters, I am using W296 and W209 primers.

thanks for the wisdom.




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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Tue Sep 29, 2020 4:21 am 
Field Grade

Joined: Thu Oct 04, 2018 4:22 am
Posts: 77
Welcome to the world of .410s, and to the forum. The information you seek can be found here:

http://www.hodgdonreloading.com/

-Ed


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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Tue Sep 29, 2020 5:58 am 
Crown Grade

Joined: Sat Feb 05, 2005 4:51 pm
Posts: 10875
Location: Phoenixville PA
1947 may be 73 years ago, but it was NOT the "Dark Ages". Unless the gun has been mistreated or abused, and does not have destructive barrel pitting, it will meet SAAMI specs for ammunition and can use modern ammunition and reloads that meet those specs..

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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Tue Sep 29, 2020 9:46 am 
Crown Grade

Joined: Sun Mar 03, 2013 11:01 am
Posts: 6069
Location: Newton Kansas
14,000psi and below.

14,000psi is the maximum any single load of a test grouping, making a Maximum Average of 12,500psi, is permitted to be.

To put it another way, all cartridge pressure are derived as AVERAGES, the Maximum Average (which is "Standard Service Pressure") for the .410 Bore is 12,500psi, with any single load not to exceed 14,0000psi.

The 3" .410 ammunition is no different, it is however proofed slightly higher.

Unless your old gun is "damaged" in some manner (corrosion, damage (cracking, breakage), or extreme wear), your "old" gun is as capable of firing standard ammunition in 2020 as it was in 1947.

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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Tue Sep 29, 2020 11:38 pm 
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Joined: Sun Aug 24, 2003 3:31 pm
Posts: 17869
Location: Kearney NE
The old Model 42 is probably the toughest shotgun you’ll run across. I’ve never ever heard of a 42 having a pressure issue. Anything that’s OK today is OK in that “old” 42. Mine is a bit older than yours, got a million miles on it and hasn’t chambered a shell in probably 25 years.

BP

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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Wed Sep 30, 2020 8:43 pm 
Limited Edition

Joined: Mon May 25, 2015 10:42 pm
Posts: 363
Location: In The Woods Of The SC Low Country
BTW.......my mld 12(1918) and my mdl 97(1917) both shoot with ease any modern shell or my reloads.
Both have had a lot of OOB through them too. Deer hunting..........Your mdl 42 is better made than any of the modern stuff made today........Relax and enjoy.


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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Thu Oct 01, 2020 7:51 am 
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OldStufferA5#1911 wrote:
To put it another way, all cartridge pressure are derived as AVERAGES, the Maximum Average (which is "Standard Service Pressure") for the .410 Bore is 12,500psi, with any single load not to exceed 14,0000psi. I'm pretty sure you meant to type 14,000 here; NOT 140,000.

The 3" .410 ammunition is no different, it is however proofed slightly higher.

Sorry OS, but I believe that is an incorrect statement. The 2 1/2" chambered shotguns are, in fact, limited to 12,500 PSI average pressure maximum. However, the 3" chambered shotguns are limited to 13,500 PSI average pressure maximum.

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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Thu Oct 01, 2020 5:33 pm 
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Joined: Wed Nov 19, 2008 3:04 pm
Posts: 828
Location: Eastern Ohio
Average means adding the total shots and dividing by the total number. That includes the high and the low. Average means just that.

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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Thu Oct 01, 2020 5:39 pm 
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dutch7373 wrote:
Average means adding the total shots and dividing by the total number. That includes the high and the low. Average means just that.
Okay - and this pertains to this thread how?

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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Thu Oct 01, 2020 5:45 pm 
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Joined: Wed Nov 19, 2008 3:04 pm
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Location: Eastern Ohio
Average pressure means there are some over 12500 and some under. Easy to understand.

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The definition of insanity, doing the same thing over and over and expecting different results. Albert Einstein
There is nothing common about good sense.


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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Thu Oct 01, 2020 6:29 pm 
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Location: Mormon Mecca
dutch7373 wrote:
Average pressure means there are some over 12500 and some under. Easy to understand.
Yes indeed - VERY easy to understand. So easy, in fact, that I'm pretty sure nobody here was confused about it. But I could be wrong about that. Thanks for clearing that up for anybody that was confused - I guess.

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Bob Hicks, from Mormon Mecca
I’m 78 years young and going as hard as I can for as long as I can.
“Be who you are and say what you feel, because those who mind don't matter, and those who matter don’t mind.”
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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Thu Oct 01, 2020 7:03 pm 
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I have seen published loads for Winchester AA CF 2 1/2” shells with Win 296 1/2 oz loads ranging from 13.5 grains all the way up to 17 grains. So there must be a lot of forgiveness with 296/H110.

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 Post subject: Re: barrel pressure range reloading 410 for old Winchester M
PostPosted: Thu Oct 08, 2020 11:53 am 
Crown Grade

Joined: Sun Mar 03, 2013 11:01 am
Posts: 6069
Location: Newton Kansas
dubob wrote:
OldStufferA5#1911 wrote:
To put it another way, all cartridge pressure are derived as AVERAGES, the Maximum Average (which is "Standard Service Pressure") for the .410 Bore is 12,500psi, with any single load not to exceed 14,0000psi. I'm pretty sure you meant to type 14,000 here; NOT 140,000.

The 3" .410 ammunition is no different, it is however proofed slightly higher.

Sorry OS, but I believe that is an incorrect statement. The 2 1/2" chambered shotguns are, in fact, limited to 12,500 PSI average pressure maximum. However, the 3" chambered shotguns are limited to 13,500 PSI average pressure maximum.

Yep, I grabbed the older SAAMI Spec (1992), and not the newest one (2015).

The 3" .410 Bore is 1,000psi higher.
A 15,100psi MPSM for a service pressure average of 13,500psi.



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