Post by cherokeetracker on Oct 22, 2017 11:47:59 GMT -5
Perhaps I need to offer up a little explanation here. I try to look for a powder that will fill the case, since usually it performs better. Not true in all cases. But even though some powders can have small amounts and work in a case, we sometimes have to consider the case capacity. Ex: rifle VS Pistol. Burn rate cannot be compared to as the last word. yes it can be a beginning sometimes, But we have to remember that different powders,, it is shapes, size of granules, coatings, and porous. Some powders are more porous than others. so therefore they burn quicker that a similar powder that is denser. Also mixture of being single base or double base.
While we might find twenty powders that will work with the JR,,, More than likely we will find that with each bullet weight and design, there should hopefully be a sweet spot to a specific powder. Yes this could entail a lot of work, but deliver a lot of fun in the process. That is worst case senerio, ( to only find a single load). Best is to find at least three powders and several weight charges that produce accurate groups and help each bullet deliver the performance designed for.
Huey is not going to load dynamite loads in his pistols. I do not blame him. It would be nice too, to quickly find a powder that is friendly and can be easily obtained. I know too well about using Vihtavouri powders and NOT being able to get them. And sometimes asking price of 46.00 a pound. Finicky is not something we want to deal with here either. LIL Gun seemed to be finicky to my observations from what Fermin stated in his post. I was surprised by his results.
Doug,, suggestions are more than welcome here, and I feel that most suggestions have been in line with what we all are trying to achieve. But hopefully you and more folks will understand that sometimes, certain powders just simply do not work for this particular application.
The JR is a small case and little changes can bring drastic results sometimes. .5 gr can be an overload sometimes. Now also I am going to bring up a point about fast burning powders. I would have thought that a faster burning powder would be better in this small case, than a slow burning one. I also want to watch placing too small of a charge into the small case with a medium burning powder. I am considering pressure spikes here. I would like to stay with 60-75% case capacity, with the faster burning powders. I am not chasing high velocity MAX loads with this either.
With some of calibers we have here, we can go up and down the ladder of velocity to suit our tastes or needs. For Hunting or just casual shooting. Huey and I both have agreed that it would be nice to have this choice in the small caliber such as the 25s that has been discussed here. Also what we need is more bullet selections.
I thought about a PM but decided that this information would be better, for all to see. Not trying to start any issues on this but to show what I am talking about. Hopefully Doug will stay my friend after this. Because this is NOT directed toward Doug for correction. But to hopefully better understand what I am talking about.
Doug suggested Longshot, AA9 as burn rate being equal or similar to N105 so hopefully we should be able to use. WE CAN !!! But here is why I did not have these first 2 powders listed on my first choices. Also I had not been able to run any of this, N105 included, as stated in an earlier Post.
Data used with the 55gr GT cast bullet.
Longshot 8.0 grs gives 62% case fill with 38,936 PSI with a velocity of 1970 FPS 100% of Longshot burned.
AA9 8.0 grs with 59% fill 15,760 PSI with 1464 FPS Only 71% of the AA9 burned.
N105 8.0 grs fills 80% of case, 21,343 PSI and 1723 FPS 92% burned.
This is simply Computer Data and is not meant to replace a pressure barrel and chronograph. But this info has helped me sometimes to eliminate some things. And I still get surprised by results occasionally.
Charles
While we might find twenty powders that will work with the JR,,, More than likely we will find that with each bullet weight and design, there should hopefully be a sweet spot to a specific powder. Yes this could entail a lot of work, but deliver a lot of fun in the process. That is worst case senerio, ( to only find a single load). Best is to find at least three powders and several weight charges that produce accurate groups and help each bullet deliver the performance designed for.
Huey is not going to load dynamite loads in his pistols. I do not blame him. It would be nice too, to quickly find a powder that is friendly and can be easily obtained. I know too well about using Vihtavouri powders and NOT being able to get them. And sometimes asking price of 46.00 a pound. Finicky is not something we want to deal with here either. LIL Gun seemed to be finicky to my observations from what Fermin stated in his post. I was surprised by his results.
Doug,, suggestions are more than welcome here, and I feel that most suggestions have been in line with what we all are trying to achieve. But hopefully you and more folks will understand that sometimes, certain powders just simply do not work for this particular application.
The JR is a small case and little changes can bring drastic results sometimes. .5 gr can be an overload sometimes. Now also I am going to bring up a point about fast burning powders. I would have thought that a faster burning powder would be better in this small case, than a slow burning one. I also want to watch placing too small of a charge into the small case with a medium burning powder. I am considering pressure spikes here. I would like to stay with 60-75% case capacity, with the faster burning powders. I am not chasing high velocity MAX loads with this either.
With some of calibers we have here, we can go up and down the ladder of velocity to suit our tastes or needs. For Hunting or just casual shooting. Huey and I both have agreed that it would be nice to have this choice in the small caliber such as the 25s that has been discussed here. Also what we need is more bullet selections.
I thought about a PM but decided that this information would be better, for all to see. Not trying to start any issues on this but to show what I am talking about. Hopefully Doug will stay my friend after this. Because this is NOT directed toward Doug for correction. But to hopefully better understand what I am talking about.
Doug suggested Longshot, AA9 as burn rate being equal or similar to N105 so hopefully we should be able to use. WE CAN !!! But here is why I did not have these first 2 powders listed on my first choices. Also I had not been able to run any of this, N105 included, as stated in an earlier Post.
Data used with the 55gr GT cast bullet.
Longshot 8.0 grs gives 62% case fill with 38,936 PSI with a velocity of 1970 FPS 100% of Longshot burned.
AA9 8.0 grs with 59% fill 15,760 PSI with 1464 FPS Only 71% of the AA9 burned.
N105 8.0 grs fills 80% of case, 21,343 PSI and 1723 FPS 92% burned.
This is simply Computer Data and is not meant to replace a pressure barrel and chronograph. But this info has helped me sometimes to eliminate some things. And I still get surprised by results occasionally.
Charles