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  1. M

    FFFF?

    When COMPLETELY confined, all black powders produce the same maximum pressure (about 32,000 psi, according to modern Russian researchers) because the chemical composition is identical. However, in a firearm, all the powder does not burn (and may not even all ignite), so granulation size and how...
  2. M

    Ballistics calculator error

    I put together the round ball calculator in question. I used the ballistics data from the British round-nose cannon reference round (19th and early 20th Century data) as a starting point and adjusted the results to account for the lower sectional density of the round ball. The output was...
  3. M

    Serpentine powder and handgonnes.

    There is a very good description of handgonne ballistics and serpentine powder in this web site. Handgonnes I believe the author is deceased, but his web site has been largely archived. A very good reference.
  4. M

    Powder Explosion Caused by Static Electricity Injures Man

    Here is a series of experiments that demonstrate that simple 'static' sparks can NOT set off black (or smokeless) powder. The 'Thunder boxes' used a stored charge (Leyden jar), which can hold much more energy than a person or simple object. It is certainly possible to set off powder with an...
  5. M

    Cast lead ball weight tolerance.

    Here is an article that looks into this a little - Ball weight accuracy.
  6. M

    what is considered a good collection of BP revolvers

    Don't forget probably the best shooting C&B of all - the Rogers and Spencer .44. I bought a (slightly used) Euroarms reproduction a few years ago off the internet for $200, and it was the best buy I ever made. This version has a non-traditional, adjustable rear sight, but it comes in a...
  7. M

    4F Black Powder Question

    First, it is important to remember that ALL black powders, regardless of manufacture and grain size can only produce a maximum pressure consistent with their chemical composition, and this is in the order of 64,000 PSI for a completely confined solid block of powder, with granulated powder...
  8. M

    Lets see some flintlock pistols!

    Here is the web page that describes everything: Breech-loading flintlock pistol
  9. M

    Lets see some flintlock pistols!

    Here is a .36 caliber breech-loading pistol I built a few years ago - shoots quite well with up to 30gr of 3F, fire-swaging a .395 ball through the barrel.
  10. M

    Up for auction - with a tear in my eye...

    I am beginning to dispose of my firearm collection before my heirs do, so now I have some of the collection going up at Morphy's (used to be Julia's) Auction this month. I found that parting with them peeled a little of me away with them, but that is the nature of life. Something we all face; I...
  11. M

    Suspicious pair of flintlock pistols

    Those are perfectly legit boxlock select-fire screwbarrel pocket pistols; I have several like them in my collection, and they are fun to shoot. As you can see, the powder chamber limits the load to about 10gr, and they generally shot a ball a bit bigger than the bore so pressure could build up...
  12. M

    Very stupid, very lucky

    Used properly, BP is a very safe propellant because the maximum pressure from ANY granular BP load is limited by the powder's physics to about 32,000 PSI. Smokeless, OTOH can generate North of 250,000 PSI, which is beyond the capacity of any steel to confine it without damage.
  13. M

    "Mang in Graz" Pistols

    You might consider buying an antique instead. A few years back I picked up a German percussion target pistol at an auction for about $1,100, and it has a micro-grooved rifled barrel (.44 cal), single set trigger and modest but nice engraving. I have seen a number of similar pistols for less than...
  14. M

    Rust stopping oil

    In case you have not seen this, here is a good review of various lubricants used with BP rifles and how well they actually prevent corrosion. https://ctmuzzleloaders.com/ctml_experiments/corrosion/corrosion2.html
  15. M

    Best barrel rust preventer ?

    Here is a study which looked at a number of products for corrosion-proofing steel fouled with black powder residue. http://ctmuzzleloaders.com/ctml_experiments/corrosion/corrosion.html And a larger follow-up study here: http://ctmuzzleloaders.com/ctml_experiments/corrosion/corrosion2.html
  16. M

    weighting in on volume

    Unfortunately, the link seems to be broken...
  17. M

    weighting in on volume

    Here is a web page which gives the densities and packed weight of a number of powders: http://ctmuzzleloaders.com/ctml_experiments/bp_burning/bp_burning.html
  18. M

    SOLD .62 Jaeger

    As mentioned on its web site, it uses a .580 ball and a .018 patch.
  19. M

    SOLD .62 Jaeger

    It does not have a patent breech. It does have a gold touch hole insert which is about 1/4" in diameter with about a 1/16" touch hole - much smaller overall than the larger ones used by British gunmakers.
  20. M

    Measuring group size?

    If you want the most reliable method, you should use the metric used by the military, which is a statistical method called 'Circular Error Probable'. It is easy to use and can give fairly accurate results with groups as small as 10 shots. See how it is done here...
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