Bismuth in a lead recipe

[Jeff Elder]

Originally Posted by Jerry Harlow

http://www.hodgdonreloading.com/relo...reloading-data


Matching Shot Type and Size to Reloading Data

It is easy to assume that all shot types can be reloaded similarly; after all, they look the same – being round balls of metal. However, in loading shotgun shells, this assumption cannot be further from the truth.

The two characteristics of shot that change reloading data are shot hardness and density.

Shot hardness has a direct effect on chamber pressure. Softer shot produces lower pressure; harder shot raises chamber pressure dramatically. The softest shot type is lead. The hardest shot types are steel and tungsten. Bismuth falls between lead and steel. This is the primary reason that lead shot reloading data can never be used with any other type of shot.

Shot density affects how much room in the shell case the shot charge will take up. To try to simplify shot density, think of it this way:

A coffee cup of steel shot weighs less than a coffee cup of bismuth shot
A coffee cup of bismuth shot weighs less than a coffee cup of lead shot
A coffee cup of tungsten shot is heavier than all the others

Just remember, in shotshell reloading the reload data must be specific to the type of shot being used. Hodgdon reloading data meets this requirement.

Thank you for breaking that down. Fully understand now.

[Victor Wasylyna]

Swapping bismuth for lead does not concern me. See this thread:

http://parkerguns.org/forums/showthr...&highlight=Wsf

I tested the same load twice: one test with 1.25 oz of bismuth and one test with 1.25 oz of lead. All else the same. I was not surprised when the velocity and pressure data were essentially the same for both loads.

What’s heavier? 1.25 oz of bismuth or 1.25 oz lead?

The difference in volume is easily accommodated with less fiber wad in the shot cup.

-Victor

[J. A. EARLY]

Fine and dandy, for the 10 in a low pressure load. Squeeze it into a 20 or 28 gauge loading it to standard velocity and pressure for modern loads for say an automatic and this may not be true. A 20 gauge barrel in a vintage gun never approaches the thickness of a 12 or 10. The question was a general one, not specifying gauge, velocity, or pressure of the load to switch from lead to bismuth.

So why monkey with it when bismuth loading data is readily available? Bismuth is harder but weighs less, so there will be more shot in the column to reach the same weight thus probably requiring a new deeper shot cup wad in the smaller gauge so now one has changed not only the shot thus hardness, but also the wad used. It will not require a filler in the shot cup but will take up more room. So we are not using the original lead data.

But if one insists, they could always send it off for testing like you did.

[Jeff Elder]

Originally Posted by Jerry Harlow

Fine and dandy, for the 10 in a low pressure load. Squeeze it into a 20 or 28 gauge loading it to standard velocity and pressure for modern loads for say an automatic and this may not be true. A 20 gauge barrel in a vintage gun never approaches the thickness of a 12 or 10. The question was a general one, not specifying gauge, velocity, or pressure of the load to switch from lead to bismuth.

So why monkey with it when bismuth loading data is readily available? Bismuth is harder but weighs less, so there will be more shot in the column to reach the same weight thus probably requiring a new deeper shot cup wad in the smaller gauge so now one has changed not only the shot thus hardness, but also the wad used. It will not require a filler in the shot cup but will take up more room. So we are not using the original lead data.

But if one insists, they could always send it off for testing like you did.

Sorry about that.

16 gauge 1 once load in a Chedite 2 3/4 hul.
I have found A bismuth recipe for Remington that I like. It's 1200 fps with 8500 psi. Only problem is I'm only getting one reload out of Remington hull before it splits.
I searched around and cheddite hulls get good reviews. Only problem is in my 16 gauge manual from BP is all their chedite recipes for one once are fairly hot. And no I don't want to shoot less than one once.

[Ron Scott]

Originally Posted by Victor Wasylyna

Swapping bismuth for lead does not concern me. See this thread:

http://parkerguns.org/forums/showthr...&highlight=Wsf

I tested the same load twice: one test with 1.25 oz of bismuth and one test with 1.25 oz of lead. All else the same. I was not surprised when the velocity and pressure data were essentially the same for both loads.

What’s heavier? 1.25 oz of bismuth or 1.25 oz lead?

The difference in volume is easily accommodated with less fiber wad in the shot cup.

-Victor

Great info Victor -- thank you for sharing. There is so much misinformation out there that gets passed on from one person to another without anyone actually testing its veracity. That's why I really enjoyed the series of articles, "Finding Out For Myself" by Sherman Bell in DGJ. He dispels many of they myths we have taken as facts for years.

Question: when the testing lab tests a load for pressure does their test gun have a choke or is it cylinder bore? I would assume it's cylinder bore which brings up the issue of how soft vs hard shot gets squeezed as the shot column enters the choke area of the barrel. Again, I am assuming, that steel or bismuth, being harder than lead isn't so easily squeezed down to the smaller diameter and thus would cause higher pressure than the softer lead.

I don't agree that the pressure difference (if any) can be attributed to the volume of the shot column. As you say, and ounce of lead weighs the same as an ounce of bismuth -- so what difference could it make? The only difference is hardness and the shot column's resistance to the squeezing down at the choke.

Another myth probably but I've heard you should not shoot steel shot through a full choke because you could ring the barrel just ahead of the choke constriction. I am sure someone has tested this, I just haven't seen the results.

[J. A. EARLY]

Originally Posted by Ronald Scott

Another myth probably but I've heard you should not shoot steel shot through a full choke because you could ring the barrel just ahead of the choke constriction. I am sure someone has tested this, I just haven't seen the results.

This is not a myth. Because in steel shot one is using shot two or three times larger to get the same killing power as lead. Thus if one liked BBs for geese, they now skip BBB and go to T which at 40 yards delivers 12.5 foot pounds of energy which approaches but does not quite reach the 13.8 of lead.

T steel is .020 which is approaching #4 buck of .024. When the full choke compresses the steel pellets which do not give any you can get bridging of shot, shot that is not going anywhere as they touch each other and the barrel may ring or split, especially if it is an older gun not designed for steel shot. The barrels that are designed for steel and have the thickness of a small water pipe will not ring or split.

The rule is for steel if one wants a full choke pattern, shoot modified because the pellets do not deform as lead does and the pattern will be denser.

[Mark Garrett]

"I don't agree that the pressure difference (if any) can be attributed to the volume of the shot column."

This statement could not be more wrong , especially when dealing with loads that are close to max pressure . It can get dangerous really quick.

In the case of Victors' loads he increased the column height in the lead loads with 2 16ga ocs cards to make the load crimp well . Now take the same lead load with extra filler and substitute bismuth and have it tested and the pressure of that will be greater than the original bismuth load .

[Ron Scott]

Originally Posted by Mark Garrett

"I don't agree that the pressure difference (if any) can be attributed to the volume of the shot column."

This statement could not be more wrong , especially when dealing with loads that are close to max pressure . It can get dangerous really quick.

In the case of Victors' loads he increased the column height in the lead loads with 2 16ga ocs cards to make the load crimp well . Now take the same lead load with extra filler and substitute bismuth and have it tested and the pressure of that will be greater than the original bismuth load .

I doubt it -- show me some data to support your claim. IMHO The filler would change the pressure only because the entire payload is slightly heavier but the volume being greater due to filler has very little effect. It's the weight of the payload that makes the most difference.

Try just light weight filler and no shot at all -- put a bunch in, try different amounts -- you'll see very little difference.