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Bearing Surface Area Of A Ball

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This match shooter in New Zealand certainly cares:

"I shoot at 25m targets and load for accuracy which in the Uberti is 21grains of fff then semolina filler with the ball loaded on top. This is then covered with a lube/grease. The ball is pure lead I cast from a Lee 6 gang mould. The lube is made with petroleum jelly with a small amount of lithium grease added(Ive never measured the amount) Using traditional sights ie front sight and the groove in the frame it will shoot x ring 10 and 9 ring. About 2 inches duelling (one handed) is normal. Using 454 the group opens up to about 3.5 inches. I load the ball with the sprue down and have to aim 100mm (4 inch) low and 50mm(2 inch) to the left. It takes three fouling shots to settle but will then shoot consistantly all day. The semolina acts as a scourer and cleans crud out of the barrel with each shot. The only problem occurs with the cylinder binding after about 25 shots. A quick clean and lube sorts that out. I will say that the ball weight makes a difference. For competitions I weigh each ball . The consistancy of loading is vital. I find the ball needs to be as flush as possible to the cylinder with minimal jump to the forcing cone. I have never used a chrono on this load but might just for curiosity try this Sunday. We have a traditional and modern bp pistol shoot scheduled along with a std pistol ISSF and a Russian shoot at 50m with hand guns. Will be a busy day. Love it."

I asked about the diameter of ball he usually uses since he didn't mention it, which seems obvious it's a .457" ball, but I had to hear it from him. Nearly twice the group size is significant.
 
Take a look at New Zealand's position on the map - use a real globe, and you'll quickly discover that the New Zealand shooter was just funnin' ya. In reality he was expending a lot of effort chasing balls that kept rolling off the table while he attempted to load, and had to often stop to rest, since the blood kept rushing to his head as he stood, upside down relative to North America.
 
Having carefully considered all the mathematical formulae contained herein and variations thereof, I think I'll just shove a ball down on the powder an' pull the trigger! :wink:
 

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