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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing
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Sarg
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Reged: 20/01/07
Posts: 1365
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8 & 10 Bore Barrels where from - May be 20MM ?
      #125527 - 31/01/09 04:14 PM

Does any one know where normal 8 Bore & maybe 10 Bore rifle barrels can be otained ?
Chopper Lumps are a bit much right now .
I know you can get 20MM (.825) barrels with a 1in 20 twist I think (too fast) so I could use a smaller = lighter ball & still have 8 bore cambers .
does any one know the weight of a .825 lead or WW lead ball ?

Thanks to all !

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rigbymauser
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Reged: 15/05/05
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Re: 8 & 10 Bore Barrels where from - May be 20MM ? [Re: Sarg]
      #125533 - 31/01/09 06:49 PM

Hey Sarg.

My 10 bore is .793cal which is 20.14mm. The 8bore is .875cal.
An 8bore roundball weigh approx 56 grams or 864 grains.
A twist of 1:50 in these calibers are more than enough to shoot heavy bullets

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elvas
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Reged: 18/04/06
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Re: 8 & 10 Bore Barrels where from - May be 20MM ? [Re: Sarg]
      #125534 - 31/01/09 06:55 PM

Sarg,
The weight of a .825 pure lead ball is 845 grain (D^3 x .5236 x 2,873.5).
I estimate about 50 to 70 grain less when using WW metal.
Lefteris.
www.europeancartridgeunlimited.com

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DarylS
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Reged: 10/08/05
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Re: 8 & 10 Bore Barrels where from - May be 20MM ? [Re: elvas]
      #125563 - 01/02/09 04:38 AM

According to my list of bore diameters, 10 is .775" - 8 is .835".

Modern rifles are measured for size to the bottom of the grooves. Black powder guns, ML's as well as Breech Loaders were usually measured to the bore diameter, not the groove diameter. Many people say their bore is .xxx" but they are meaning the groove diamter - it is confusing. This makes it difficult to address proper ball, patch or bullet diameters for use in their barrels.

I've a friend with a, 11 bore(.751") rifle as in .75 cal. English Sporting Rifle, period 1855 - Purdey style. It is a Muzzle Loading Rifle and the barrel is indeed an 11 bore at .750"(close enough) as that is what it measures. Unfortunately for him (another story) the rifling is .025" deep - PER SIDE, giving this rifle a groove diameter of .800". How many people would call this gun a 9 bore, (9 bore is .803") - but wrong - it is a .75 cal barrel so it is an 11 bore fur use with round balls and patches. If he shot groove diameter conicals in it, it would indeed, be a 9 bore - it can be confusing.

When shooting round balls with a patch - we measure a gun's calibre by the bore diameter as that measurement effects the size of the ball that can be used, whether it is a rifle or smoothbore also effects the size of the ball that can be used.

When shooting a bullet, the groove diameter effects the diameter of the bullet, so we use groove diameter for addressing it's size.

20" of twist is a lot fast for a 10 bore, let alone an 8. 20"of twist is for 1" to 1 1/2" long bullets in a .45 rifle. In order to need or utilize that much twist in a 10 bore, you would need a bullet that was 2 to 3 calibres long. How heavy is a 1 1/2" to 2 1/4" long bullet of .750"? Who could stand the recoil - what gun could - ridiculous.

50" to 70" would work for a short conical or the original type in 10 to 8 bore and yet, still work reasonably well with round ball if one desired.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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Sarg
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Reged: 20/01/07
Posts: 1365
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Re: 8 & 10 Bore Barrels where from - May be 20MM ? [Re: elvas]
      #125581 - 01/02/09 08:13 AM

Thank you for the info all & the ball weight elvas , so a .825 ball is not much less than a .835 in weight , would still be a good killer at 1650fps - 1750fps ?

I would need them to do a custom twist from 1 in 50 to 1 in 80 then ?
there barrels are 9 groove if that matters ?

Any one know another company from Pacnor that makes big barrels , I thought ED might have a contact ?

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