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4 members (HalfaDouble, Lloyd3, SKB, 1 invisible),
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Forums10
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Jul 28th, 2025
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Joined: Jan 2006
Posts: 9,770 Likes: 466
Sidelock
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Sidelock
Joined: Jan 2006
Posts: 9,770 Likes: 466 |
No. 7 1/2 1374 MV to 1300 3' = 74 fps  No. 8 1336 MV to 1263 3' = 73 fps 
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
With a chronograph some spacing of the pickups are required in order to have a time/distance relationship. At 1200 fps with a one foot spacing you would read .00083 seconds. I do not know what the minimum time interval for modern chrono's is, but that might well be a limiting factor.
Time of flight over 20 yds for the 1330 fps load was .0548 secs, thus an average speed of 1095 fps (Read that as observed velocity over 20 yds)
Time of flight for the 1135 fops load over 20yds was .0626 secs for an average velocity of 958 fps. Thus a difference of 195 fps at the muzzle amouited to a difference of 137 fps at a point inside 10 yds. It is rather obvious loss came quicker above sonic than at any other point & that drag was not linear according to V˛..
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Jan 2002
Posts: 11,574 Likes: 167
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 11,574 Likes: 167 |
Interesting stuff. Thanks, Drew and Miller.
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Joined: Jun 2008
Posts: 2,768 Likes: 115
Sidelock
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Sidelock
Joined: Jun 2008
Posts: 2,768 Likes: 115 |
The old muzzle loader's mantra was 'Little powder, much lead, shoots far, kills dead!'
As for cartridges I went to the local black powder shoot (only about 10 or a dozen show up on a good day) and as it was a rainy day I though I would be a bit lazy and took along an old Harrison & Richardson 12 bore single and some Baikal cartridges that were supposed to be for 2 1/2" chambers. Number six shot but load not specified but I suspect 1 1/8th. ounce. I'd had them (stored correctly) for about 40 years. My goodness they were tooth rattlers. What the velocity was I have no idea but they bust the clays; in fact they just pulverized them! Fearsome things that I certainly would not use in a 2 1/2" chambered gun. I still have about 180 left. Any takers? Lagopus.....
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Joined: Nov 2015
Posts: 67
Sidelock
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OP
Sidelock
Joined: Nov 2015
Posts: 67 |
According to a ballistics calculator I used, it seems that with #6 English shot, a 1255 fps muzzle velocity would give the roughly 1050 fps average over 20 yards. This is at an altitude of 500 feet, and a temperature of 68 degrees Fahrenheit, the actual average velocity I got was 1058 fps.
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Joined: Nov 2015
Posts: 67
Sidelock
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OP
Sidelock
Joined: Nov 2015
Posts: 67 |
I wouldn't mind taking some of those off of your hands, PM me.
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