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#496476 - 12/02/17 10:20 AM Re: Gibbs Farquharson [Re: 49NORTH]
Poorhouse Offline
Sidelock
**

Registered: 09/11/08
Posts: 44
If I were much younger, I would be tempted. Maybe the next "custodian" will consider a recreation.

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#497102 - 12/06/17 09:07 PM Re: Gibbs Farquharson [Re: 49NORTH]
49NORTH Offline
Sidelock

Registered: 02/20/06
Posts: 54
Loc: NORTHERN B.C.
Finally back at this, got a chance to slug the barrel, I couldn't find a pin gauge to use, the slug measures .468.When you look down the barrel the rifling is extremely shallow, it looks like just swirls down the barrel. There are definitely lands but not very pronounced. After more research I think a 540 grain paper patch cast bullet over over 70-90 grns Swiss #4, now I just need brass.

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#497103 - 12/06/17 09:09 PM Re: Gibbs Farquharson [Re: 49NORTH]
BrentD Offline
Sidelock
***

Registered: 01/21/04
Posts: 2604
Loc: Iowa
How fast is the twist? I would guess that a 540 gr bullet will be too long for whatever the twist is. I'd want to double/triple check anyway. Is it Metford rifling? It looks swirly, but is not really that shallow, just rounded.

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#497106 - 12/06/17 09:26 PM Re: Gibbs Farquharson [Re: 49NORTH]
49NORTH Offline
Sidelock

Registered: 02/20/06
Posts: 54
Loc: NORTHERN B.C.
Brent, I do believe its Metford, the barrel is marked Metford on top, I wouldn't know the twist or how to measure it, the rifling barely shows on a chamber that goes 3 inches into the barrel, they are defiantly there but not very pronounced. The original bullets for the were if I remember right were 360 grn hollow point, 540 grn for express load? and 570 for match, this is all I have found so far, so I thought I would start there.

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#497107 - 12/06/17 09:37 PM Re: Gibbs Farquharson [Re: 49NORTH]
BrentD Offline
Sidelock
***

Registered: 01/21/04
Posts: 2604
Loc: Iowa
49N, I just fit a really tight patch to a jag in on a good cleaning rod. Then I put a piece of tape around the rod so that the tag end of the tape is straight up when the patch is engaged in the rifling near the chamber. I push it forward being careful to allow the rod to twist as the rifling wants to rotate it until the tape has done a full rotation. I measure the distance the rod has moved forward to get the twist rate. Easier to do than to explain. I bet the 540 is way too heavy for an express load. 400 or less would be my guess. That 360 hollow point sounds about right. But I'm guessing a bit.

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#497112 - 12/06/17 10:20 PM Re: Gibbs Farquharson [Re: 49NORTH]
49NORTH Offline
Sidelock

Registered: 02/20/06
Posts: 54
Loc: NORTHERN B.C.
Brent, took me a couple of tries but, your method worked great, it worked out to be 1/2 turn in 20inches, 25 inch barrel, so then it would be 1 in 40.

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#497182 - 12/07/17 12:44 PM Re: Gibbs Farquharson [Re: 49NORTH]
Bob Saathoff Offline
Sidelock

Registered: 03/29/09
Posts: 114
Loc: MN
49North, If you slug the muzzle of your rifle, you will probably find that it is smaller at the muzzle than it is at the breech. I have a Metford barrel in #2 Musket that has a groove of .469" and bore of .455". At the muzzle, it is .450". Think of it as a long funnel. This is what Metford segmental rifling looks like. Is that what you have? Could it be a gain twist?


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#497292 - 12/08/17 09:40 AM Re: Gibbs Farquharson [Re: 49NORTH]
Huvius Offline
Sidelock

Registered: 03/07/10
Posts: 94
49N, your rifle would have surely used a 480gr bullet and a charge of 85grs of powder. The 540/75 load was a target shooting type load in the No.1 cartridge that pretty much replicated the performance of the 577/450 MH. Your rifle being a sporter and not a MBL or match rifle, I would think the 480gr is it.
From my reading, the 360gr bullet was introduced well after your rifle was made.
That said, many of the later Gibbs sporters were sighted for both the 360gr and a 570gr bullet and shoot both well so don’t get hung up on your bullet’s weight too much to begin with. The Metford rifling must be pretty forgiving in respect to bullet weight variation.

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#497293 - 12/08/17 09:46 AM Re: Gibbs Farquharson [Re: 49NORTH]
49NORTH Offline
Sidelock

Registered: 02/20/06
Posts: 54
Loc: NORTHERN B.C.
Bob, no mine does look more like conventional rifling, just really really shallow.I am pretty sure the entire bore is .468 and has 7 grooves and 7 lands, my first attempt at measuring the bore from my chamber - bore cast was wrong as I put my digital caliper on the cast and slowly rotated it to get the reading I now see that probably wouldn't work properly.

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#497296 - 12/08/17 09:55 AM Re: Gibbs Farquharson [Re: 49NORTH]
49NORTH Offline
Sidelock

Registered: 02/20/06
Posts: 54
Loc: NORTHERN B.C.
You guys are great, I really appreciate your patience and help.
The one thing that keeps eluding me is bullet diameter, I just cant figure out what I need to start with.
I have 100% cotton 9 lb paper for patching,
I am proficient in casting and reloading.
And is there a commercial available mold that would be a good staring point?

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