8300 PSI TOO MUCH FOR 10 GA TWIST

[Richard Flanders]

Those are Shermans notes, not mine. Can't remember how/where I got them.

[10ga Hammer]

Richard, If I'm not mistaken those "NOTES" accompany Sherman Bells Excell spread sheet for 2 7/8, 10ga reloading data.

[J. A. EARLY]

Richard,

Thanks. I had downloaded a .pdf file from this forum a while back but only three pages of reloads with no notes. I don't have access to that particular article, however last year I did read the article in a friend's DGJ where they finally were able to blow the Damascus barrels of a Parker at the breech face with a tremendous overload, but only after many progressions in increasing the charges.

I am looking for very low pressure loads to be safe. These NH barrels are the thickest of any gun I have, although they are Twist. Twice as thick as one of my 20s. I am going to find a 7000 psi or less load to live with.

[Richard Flanders]

Robert: That's where I have the notes but it seems there is more than one version of the load data that was distributed and that some got a copy without the notes. I don't remember where I got my spreadsheet that includes the notes in a separate worksheet.

[J.B. Books]

Where to find them.

http://www.ballisticproducts.com/X10...tinfo/072X10X/

[StubTwist]

Originally Posted by Pete Lester

Where to find them.

http://www.ballisticproducts.com/X10...tinfo/072X10X/

Thanks Pete. Things are starting to get more clear what these abbreviations and acronyms are.

According to the "notes x10x are stated as over powder card from Ballistics Products. I thought it simply was any nitro card which also goes over powder. A bio-gradable gas seal or spacer wad.

Secondly, while on the subject. If you look at the wad combo for load #90. What does x10x 2 1/4" MR mean?

2 1/4" of what??

[charlie cleveland]

i believe it means the mylar plastic wrap ..to be cut from sheet of plastic called mylar...its purpose to help keep a uniform pattern and protect the barrel.... charlie

[Big Friend Ten (BFT)]

Charlie,

You are correct except that mylar wrappers are available pre-cut for 10 and 12 gauge shells. They are available in thicknesses of .005" and .010". Their purpose is to of course increase the thickness of compressable material, such as the wad petal, between the hard shot and the softer barrel. Mylar also reduces friction which should in turn decrease pressure.

Frank,

The x10X is a gas seal that in some loads is combined with a mylar wrap to replace what would in other loads be the wad.

Load #90 calls for (1) [thanks to Pete's correction below] x10x gas seal, (2) 1/4" filler (16 gauge wads or portions thereof) and MR (mylar wrap).

Mark

[J.B. Books]

Originally Posted by Mark Ouellette

Charlie,


Load #90 calls for x10x2 (space) 1/4" filler MR. That is two x10x gas seals and 1/4" of filler (1/4" tall section of a 16 gauge fiber wad) and a mylar wrap

Mark

I read it differently, (1) x10x and (2) 1/4" filler plus MR (it would seem 1 1/2" filler wad would work just as well). I don't see the point of using more than one gas check. Load 78 would require 3 gas check/seals???

[Big Friend Ten (BFT)]

Pete,

You are correct. I never looked at any of the 3 1/4" filler loads.

I shall correct my post so that someone doesn't read it and follow my erroeous guidance.

Mark