cowpoke1955
58 Cal.
- Joined
- Oct 23, 2006
- Messages
- 2,090
- Reaction score
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You can also check ebay for bees wax. I've seen a lot of it there.
I fear we are fighting a rear-guard action on this increasingly pervasive misuse of a transitive verb identifying an effect as an intransitive verb identifying a cause. This misuse occurs only in internal ballistics, but unfortunately, this is where I hear the word the most frequently, and those who do not encounter "obturate" outside of this limited sphere may never read/hear correct usage. Apparently the OED and some technical dictionaries have limited weight here.marmotslayer said:The only reason you seem to disagree with my language is my use of the word, " Of " [the bullet] when describing obturation. My check of both my dictionary and my grammar book indicates I am using the preposition correctly.
My careful reading of your entire post indicates that you are being "obdurate". :rotf: :rotf:
R.M. said:Huh????? :surrender:
p.s. Should I open the can of worms that is the mechanism(s) of the obturation of the bore under/around a patched round ball?
The sealing could be achieved by a sphincter in a digestive tract . . .
paulvallandigham said:I disagree. Try using Unique, or 3031, or other powders in that .45-70, and you will see the bullet UPSET - as you insist on referring to obturation. 5744 powder is made specifically to be one of the slowest, low pressure powders being used. It may be slower than Black Powder. I have not tested it. But, BP does not burn with a with a Ski Jump spike as you suggest( perhaps FFFFg powder will, but that would be the exception.) BP burns slowly and has a bell curve shape to its pressure lines. That is why you need a minimum length of barrel for BP to burn efficiently.
The Bullet does Obturate. It does so in revolvers, and in rifles. I have seen this with pure lead balls, and lead conicals. With hard cast bullets in revolvers, the throat at the back of the barrel where the bullet enters the barrel will cause a slight delay causing the base of the bullet to upset in diameter due to the push of the BP gases behind it. The rest of the bullet remains its original sized shape. The back 1/10-1/18" will "bell" out a bit, and show the scoring of the lands as it passes into and through the barrel. The Belling of that base is what little "Obturation" you see using a hard cast bullet in a revolver. Even then, its rare to see that the lead is wide enough to fill the grooves in the barrel, as shallow as they may be.
The only reason you seem to disagree with my language is my use of the word, " Of " [the bullet] when describing obturation. My check of both my dictionary and my grammar book indicates I am using the preposition correctly. :hatsoff:
tiger955 said:I want to experiment with some cast bullets in my 1-48 barreled TC and am looking for a good lube recipe that will prevent leading with heavy loads. I also prefer something that will keep fouling to a minimum. I am looking for a formula that only uses common household products that can be purchased anywhere. In my searching pretty much any recipe I have found uses beeswax. Real beeswax is getting hard to find in the stores, haven't been able to find any in the state capital of NV anyway. I would prefer to use products I don't have to mail order. Was thinking of Crisco and parafin mix?
I am really worried about lead buildup. I bought a used TC years ago that was leaded so bad I finally gave up and bought a GM barrel. I have been shooting PRB's for a long time but want to use heavier bullets in my coyote/ lion gun.
Other than being messy, would plain Crisco work ok? Any advise from anyone who has experience in this would be greatly appreciated.
Oval holes or keyholes would indicate inadequate stability.
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