1862 pocket navy balistics

damoc said:

Can anyone explain to me why there is such a difference between grains weight and grains weight volume]

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?

there’s measuring by weight and measuring by volume. Not aware of “grains weight volume”

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Different grades of black powder weigh more or less due to granulation. A set volume of 4F will weigh much more than the same volume of 1F.

I weigh my charges with a grain scale. I only have one volume powder measure that matches the volume to weight. Its a brass adjustable scale...i think from traditions brand. But when i measure Old Eynseford 3f in it...it matches precisely, give or take .1 grains. All of my other detachable powder flask tips dont pour the same amount in precise volume scales...nor do they match with other brands. Like my treso tips dont match what my other brand tips pour...nor do any match on my precise adjustable volume scales...they are off by about 10%

I didn't watch the video, but how far off is "such a difference"?
If your using homemade powder, has it been corned?
My guess is that your home made powder is not the same density or consistency as commercial powder which will obviously make the weight of a given volume different.

This is a debate many who shoot black powder in competition have as well. I just set my powder measure to dispense a consistent weight that has shown to be very accurate and don't worry about it.

Now back to another factoid about the holy black, the real difference between 1f and 4f is surface area of an individual "grain" of powder. More surface area means faster burn. That's one of the differences between a quality powder like Swiss or Old E and Reenactor grade Goex where the good stuff has much, much more consistent granule size v the cheap stuff. All that adds into accuracy.

Swiss 3F is pretty close.

damoc said:

Whenever we measure out our BP charges we will mostly use a grains volume measurement I thought this was supposed to be close to the actual real grains weight that is used in smokeless reloading but it was not even close.I can understand needing a volumetric measure when using BP substitues I just thought that real BP would have been very close.

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My old rifle measure dropped 30 grns for my NMA and 35 for my ROA. When weighed (3F Olde E) it’s 33 and 38. Here’s a link where a guy tested several powders thrown from his 30 grn measure and what they each actually weighed:



His charge weighed less than what his measure dropped whereas mine weighed more. Strange.

Mr.rodwha, i would love to read the rest of that post...do you have a link you could share with us? Thank you sir!

TheOutlawKid said:

Mr.rodwha, i would love to read the rest of that post...do you have a link you could share with us? Thank you sir!

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I do:

anonymous pictures website

But did someone measured the actual volume those measures throw? This is the first thing to do - comparing it to the actual weight of the tested BP comes after that.

Thanks mr.rodwha..but i meant if you had a link to the actual website post. And going by those numbers it seems thay old eynsford is stronger than swiss if we were to compare speeds based off of a weighed load. You get an average 37.68 feet per second per weighed grain of Swiss, and you get 38.07 feet per second per grain weight of Olde Eynseford. Thats just going by deviding the average speeds by actual weight of a 30 grain volume spout. Of course more tests would need to be done..such as comparing the speeds of a matching weighed charge. Say like comparing the chrono results of a 25 or 30 grain charge by weight of the two powders and shooting them out of the same gun shooting the same bullet/ball. Things like this make me wish i had a chrono.

TheOutlawKid said:

Thanks mr.rodwha..but i meant if you had a link to the actual website post. And going by those numbers it seems thay old eynsford is stronger than swiss if we were to compare speeds based off of a weighed load. You get an average 37.68 feet per second per weighed grain of Swiss, and you get 38.07 feet per second per grain weight of Olde Eynseford. Thats just going by deviding the average speeds by actual weight of a 30 grain volume spout. Of course more tests would need to be done..such as comparing the speeds of a matching weighed charge. Say like comparing the chrono results of a 25 or 30 grain charge by weight of the two powders and shooting them out of the same gun shooting the same bullet/ball. Things like this make me wish i had a chrono.

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It’s a rather old thread, but I’ll look for it later when I have more time. As I believe posting links to other forums is frowned upon I’ll send it in a PM if that’s ok.

One thing concerning Olde E vs Swiss that I’ve come across from some who’ve used both is that Swiss is more consistent with a lower SD. Also comparing them by weight I’d assume Olde E would leave a little more fouling as there’d be more powder used (volume). I mean to compare them myself one day.

Thank you mr.rodwha. And sorry about asking for the link...i wasnt aware posting links to other forums was in bad form. Thanks for the heads up. As far as swiss being more consistent...i believe part of it is because it seems they polish their granules and also sift it more for consistent grain size. I think that if one were to perhaps get some 2ffg old eynseford and polish it and sift and separate the granules and keep only those sized to 3fffg and sift out the fines and larger granules...basically keeping the grains that are of the same size only and comparing it with swiss....it may outperform it. But maybe its just wishful thinking as i like cheering for the underdog. I make my own powder...but when i purchase...its only old eynseford 3fff. It really is a great powder and does not cost much more than goex regular. The cleanliness and performance is well worth the extra 2-3 bux a pound.

Nothing to be sorry about, and I’m not sure if it’s necessarily frowned upon (or against the rules), but I know several forums do have issues with such so I just go along with that no matter what.

I prefer to support the American company if possible. Never know what the future might bring. And it’s cheaper. I’m happy enough.