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  1. R

    What's the attraction

    BEsides, if you have seen any hillsides strewn with percussion caps, it was hapless pilgrims what done it. :-)
  2. R

    What's the attraction

    Sorry, I had to say that.... ! But I mean it. Where I live in TExas there is flint almost anywhere, and generally true in lots of other places. I haven't used store-bought flint in a gun in probably 20years... although I have some English flints only for keepsakes. That strikes me as a...
  3. R

    What's the attraction

    IF the Lord had intended for men to use caplocks, He woulda' strewn the hillsides with percussion caps....
  4. R

    3F or 4F for the main charge?

    I agree that a poorly made gun is liable to cause a problem. But that seems to be beside the point, since a poorly made gun is liable to blow up with ANY load. I also agree with others that 3F is safe if a reasonable load (less than a reasonable 2F load). I do not use 3F exclusively now, but I...
  5. R

    4f for main charge in .36 cal

    Paul, I posted on a site here http://www.theopenrange.net/forum/index.php?topic=6429.0 where a fellow named William Kight (Dutch Bill) often posts. He has a lot of experience in the BP industry, very knowlegable on the subject, and has consulted for Goex and others. At that link you can see...
  6. R

    4f for main charge in .36 cal

    Paulvallandigham, Why would you expect more standard deviation in muzzle velocities from 4F than from 3F? Is it because of less tight control of grain size, ie, higher ratio of larger to smaller grain and subsequent un-mixing of powder in the can over time? YHS, rawdog
  7. R

    500 meter rams vs 50 cal. prb's.....

    According to a ballistics program using the GS drag curve for roundballs and a ballistic coefficient of .104 for the 176 grain .490cal ball and assuming a 100yard zero with 1750fps muzzle velocity: The drop at 500yards is 67.5 feet and the remaining velocity is 309fps. The drop at 300yards is...
  8. R

    Stuck in Barrel...

    I liked this suggestion of a coil of wire on the end of the ramrod, simple...as long as it does not turn too easily on the end of the ramrod. I have before made a worm from a used borebrush by using side-cutting pliers to cut the brush about a half-inch above the brass base and spread the two...
  9. R

    Round balls and the Greenhill formula

    RunnBall - If you can hold the Saracen's off my back for a few more minutes, I can explain a discrepancy I mentioned above.... The popularly given GreenHill's Formula assumes, among other things, that the air drag coefficient is constant with velocity; but it is not (see on this page...
  10. R

    replacement lock?

    I have an LR RPL lock for a Dixie Squirrel Rifle. I bought it as a replacement in case I ever needed it. Haven't needed it yet. However, this lock sits at my desk as a paperweight and I often pick it up and spark it.....sparks really well, and the flint in it has had many many strikes (at...
  11. R

    Round balls and the Greenhill formula

    The shape of Greenhill's original bullet was a Prolate Spheroid, not Oblate (gosh, darn!). :grin: YHS, rogerw
  12. R

    Round balls and the Greenhill formula

    Ciffer, I warn you that unless you have a physics or engineering background you are not likely to like the paper: Greenhill's 1879 paper was printed in England in The Royal Artillery Journal, he was an instructor at the Artillery College there. But it was re-printed in 1880 in the United...
  13. R

    Round balls and the Greenhill formula

    [probably more than you wanted to know....] I have a copy of Greenhill's original 1879 paper, and I can tell you that it is actually a good bit more complicated than what you generally see given as "Greenhill's Formula." The original formula was actually derived for an "oblate spheroid"...
  14. R

    When were CVA's made in USA?

    I have a CVA Mountain Rifle in .50cal that was bought as a kit in 1980 used, and it had "Made in USA" on the barrel. That barrel was poorly rifled, and I rebarreled it a number of years ago with one from Deer Creek. Now it shoots very good. The lock is Spanish made. I also have a CVA two-piece...
  15. R

    General Comment - Accuracy vs Caliber

    I agree with Paul, I thought it was answered more or less to the degree that enough info was available to enable an answer to it, and in the process some other questions came up. I hope that is not a bad thing....? YHS, rawdog
  16. R

    General Comment - Accuracy vs Caliber

    Well, I happened to have Greenhill's paper in hand when I read this thread..... :grin: Seriously, from a theoretical POV, if the ball comes out in the shape of a sphere (I will address again down below), then there is no reason to give it gyroscopic stability to prevent tumbling...
  17. R

    General Comment - Accuracy vs Caliber

    I have a copy of Professor Alfred G. Greenhill's 1879 paper in which he derived his famous Greenhill Formula for twist. It is highly mathematical, but someone with a math/physics or engineering background can follow it. It is actually MUCH more complicated than the approximation you usually see...
  18. R

    "Rotational Drift"

    Plink is almost entirely correct. A gyroscope, if pushed on one end of its axis in a direction perpendicular to its axis, will respond by moving in a direction +90deg (angularly in the direction of spin) from the direction in which the force was applied. This is basic to the physics of a...
  19. R

    Blackpowder Density

    Well, now I know why I thought I had posted an article here (Army Ballistic Research Labs paper on how the physical attributes of blackpowder affects the performance thereof) and yet couldn't find it, so I posted it again, and it is still not here. It was deleted on the grounds of violating the...
  20. R

    Blackpowder Density

    MmSlyr, I have been under the general impression for some time that the 2001 2Ed Lyman data for Goex2F,3F is "hotter" than the data for the 1975 1stEd Lyman data. That closeness of the old 3F to the new 2F would support that notion, but I need to examine that more closely. Much of what I have...
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