410 Shell Psig

[classicioi]

Are the store bought 410 - 2 1/2" - 1/2 oz shells safe to shoot in a mechanically sound vintage 410 SxS ?

I have always shot the RST - 2 1/2" - 1/2 oz shells that are 5000 PSI but haven't been able to find what psig the Winchester, Remington, Federal etc. shells are.

Do you think they would be a lot higher than the RST's ?

Thanks

[Researcher]

According to the old Winchester loading guide, the 1200 fps 1/2-ounce load, pushed by 14-grains of 296, in the compression formed AA hull was 9800 psi. The load I currently use in Remington STS hulls, 13.2 grains of Lil'Gun, is 10,800 psi. The SAAMI spec for 2 1/2-inch .410-bore is an average max of 12,500 psi. Modern day factory loads are probably not much lower.

SAAMI Specs.jpg

[Woodcock survey]

Looking at Alliant reloading data they show 1 load for Remington cases at 6000psi with a powder i have not used . Other cases and loads range from 8000 up to 12000 psi. Wonder how RST gets them that low. Unless your gun was an unusual make or configuration i would think it would handle a current loading.

[Dean Romig]

The .410 Parkers have very stout chamber wall thicknesses.





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[classicioi]

I never paid a lot of attention to chamber pressure until I bought my first vintage Parker and started reading more about vintage guns.

I'm probably just over thinking the different 410 shells available in comparison to the RST's.

[Harold Pickens]

Unless you have damascus barrels, what is the worry with higher PSI. PSI does not even factor into the equation for recoil.
An RST 1/2 oz load at 1200 fps will have the same recoil, in the same gun as a modern 1/2 oz load at the same fps.

[classicioi]

Originally Posted by Harold Lee Pickens

Unless you have damascus barrels, what is the worry with higher PSI. PSI does not even factor into the equation for recoil.
An RST 1/2 oz load at 1200 fps will have the same recoil, in the same gun as a modern 1/2 oz load at the same fps.

Harold,

Why do people shooting Parker guns that have fluid steel barrels buy and shoot RST low psig shells ?

I've heard it said here many times that using Low Pressure RST shells will help head off potential problems with the older wood...

[Harold Pickens]

Hi Karl, good question for sure. #1. Many shoot RST because they have short chambered fluid steel guns, such as 2 1/2", and modern shells are 2 3/4".
Recoil is the problem with older wood and PSI does not enter into the recoil equation. Of course PSI is a factor in safely shooting our damascus barrels.
I load a lot of low pressure loads myself, all 2 1/2 ", so I can shoot them in all my guns.
RST keeps fps to a modest level, say 1150 to 1200 fps, and alot, but not all modern shells seem to be high velocity.
RST also keeps the payload minimal--3/4 to 1oz ( 3/4 oz in a 12, 16, or 20 is a sweet shooting load.).
Thus with a smaller payload, lower velocity, the recoil is less--and less problems with the vintage gun stocks--and thats why I shoot them.
Again Google or visit the recoil formula and PSI is never mentioned. The weight of the gun is critical, ie the same load recoils less in an 8 lb gun than it does in a 6 lb gun.

[6pt-Sika]

I’ve got an IJ Hercules and a Crescent Arms . I shoot my regular old 1200 FPS handloads and whatever the WIN / REM / Federal factory skeet loads are in both and haven’t had any problems to date . Might add I even shoot the factory 3” loads in the Hercules from time to time .

[classicioi]

Thank you Harold ... I really appreciate your reply.

Hopefully now I can find some 2 1/2" 410 shells other than just looking for RST's.

Thanks