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Shooting & Reloading - Mausers, Big Bores and others >> Muzzleloaders & Blackpowder

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tinker
.416 member

Reged: 12/03/05
Posts: 4835
Loc: Nevada

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#319194 - 20/08/18 12:44 PM

How much does this rifle weigh?

--------------------
--Self-Appointed Colonel, DRSS--

"It IS a dangerous game, and so named for a reason, and you can't play from the keyboard. " --Some Old Texan...

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Heelerau
.300 member

Reged: 31/01/17
Posts: 105
Loc: Australia

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#319200 - 20/08/18 07:34 PM

The rifle weighs about 8 3/4 pounds.

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Keep your horse well shod and your powder dry !

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Heelerau
.300 member

Reged: 31/01/17
Posts: 105
Loc: Australia

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#379029 - 01/09/23 09:41 PM

Since last here, I lost nearly everything in a bushfire back in Feb, '21 I was able to salvage the remains of my .72 Isaac Hollis, had it restocked, lock repaired, reproofed the barrel, and then fired a few shots off the shoulder. She will need a light lap to remove some patches of oxide. Pretty amazing. Most of my other firearms were totally destroyed and not recoverable

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Keep your horse well shod and your powder dry !

Edited by Heelerau (01/09/23 09:43 PM)

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93x64mm
.416 member

Reged: 07/12/11
Posts: 4213
Loc: Nth QLD Australia

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#379030 - 01/09/23 10:16 PM

Sorry to hear you had a tragic loss H!
At least you have old faithful still & she's still going strong by the sound of it.

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DarylS
.700 member

Reged: 10/08/05
Posts: 27093
Loc: Beautiful British Columbia, Ca...

Re: Isaac Hollis and Son 12 Bore Rifle [Re: 93x64mm]
#379033 - 02/09/23 02:07 AM

Glad you got the old girl shooting again, Gordon. Welcome back.

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Daryl

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

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85lc
.400 member

Reged: 19/01/18
Posts: 1038
Loc: Georgia, USA

Re: Isaac Hollis and Son 12 Bore Rifle [Re: DarylS]
#379037 - 02/09/23 02:33 AM

Heelerau,

Sorry for your loss. Very hortunate that you were able to save the Hollis but too bad about your other guns.

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RB

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bstrick
.275 member

Reged: 02/02/09
Posts: 87
Loc: MI

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#380368 - 27/10/23 02:45 AM

https://www.p-max.uk/cgi-bin/black_powder.cgi

This will show the difference of F,1.5F and FF powders.

My 12 bore has a 1-72 twist and shoots a light load 0f 4.5 drams very accurately. [not forsyth]

At 6.5 drams, you are starting to get into some power. FF

I need to find some 1.5F to try.

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DarylS
.700 member

Reged: 10/08/05
Posts: 27093
Loc: Beautiful British Columbia, Ca...

Re: Isaac Hollis and Son 12 Bore Rifle [Re: bstrick]
#380370 - 27/10/23 04:02 AM

The Swiss 1.5 F I tried worked quite well, but was heavy per volume, meaning the same volume taken up by 78gr. 3F GOEX, held 85gr. 1 1/2 Swiss (7gr. more weight). The Swiss gave lower velocity by 60 to 80fps.
I fed the particulars into the program, Bruce, and it was 300fps low of what the load actually produced in my 28" bl. 1876 .50/95.

My 14 bore ML rifle did 1,550fps with 165gr. (just over 6drams 2F GOEX) with a .682" ball of 482gr.
I've not shot it with 1.5F Swiss powder - yet.
When I input my 14 bore data with 1.5 Swiss, it showed, it showed very close to what I got using 165 2F GOEX.

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Daryl

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

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bstrick
.275 member

Reged: 02/02/09
Posts: 87
Loc: MI

Re: Isaac Hollis and Son 12 Bore Rifle [Re: DarylS]
#380374 - 27/10/23 05:56 AM

125FF and my 12 Bore showed just a few feet faster than I get with my Goex.

Accuracy with this mild load is 1.1/2" three shots at 100 yds.

It shows the pressure difference at the same velocities.

Even though slower powder is less efficient, if you use more, you can achieve a higher velocity with less pressure.

Then you just need to check accuracy.

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bstrick
.275 member

Reged: 02/02/09
Posts: 87
Loc: MI

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#380381 - 27/10/23 07:40 AM

Heelerau,

Your gun was made for these!

https://rjrenner.blogspot.com/p/tapered-paper-cartridges.html

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DarylS
.700 member

Reged: 10/08/05
Posts: 27093
Loc: Beautiful British Columbia, Ca...

Re: Isaac Hollis and Son 12 Bore Rifle [Re: bstrick]
#380396 - 27/10/23 03:36 PM

Yes - tapered paper ctgs work very well in the larger calibres.
In my .69 using .682" ball, 2 wraps of typing paper & 165gr. of 2F GOEX, got the same poi as patched round balls and the same load. Not only that, they gave exactly the same accuracy as well. At that time, I was shooting 1" to 2" 5-shot groups at 100 meters. Several groups ran 1" to 1 1/2".
Friend Dan in Montana found paper ctgs. also do well in his 16 bore flint rifle.

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

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

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bstrick
.275 member

Reged: 02/02/09
Posts: 87
Loc: MI

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#380405 - 28/10/23 12:35 AM

Heelerau

I have a 62 that has Forsyth style rifling in a 104 twist.

The bore is .623 and I shoot a .620 RB.

It likes a tight load.

New barrel and I have only tried 135 and 150FF.

My tapered paper cartridges and a .610 RB shoot same point of impact.

You may want to try a .715 RB, or what ever is .005 smaller than the bore.

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Heelerau
.300 member

Reged: 31/01/17
Posts: 105
Loc: Australia

Re: Isaac Hollis and Son 12 Bore Rifle [Re: bstrick]
#384234 - 17/04/24 08:15 AM

I am now back in SA living with my widowed mother, still fifo to WA for the next couple of years. A mate is going to machine up a lapping rod, I will pull the breechplug on my rifle and give the bore a good lap, but not too much at the muzzle. Will post when I eventually do it with a range report. Managed to find a flask with a 3 2/1 dram nozzle !

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Keep your horse well shod and your powder dry !

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DarylS
.700 member

Reged: 10/08/05
Posts: 27093
Loc: Beautiful British Columbia, Ca...

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#384257 - 18/04/24 02:53 AM

Greener's book merely lists powder charges for the 12 bore muzzleloaders with no ball diameters given.

110gr. with a .725" ball and 191gr. with a .725" 599gr. "ball" which I assume is a very short conical.

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Daryl

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

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Heelerau
.300 member

Reged: 31/01/17
Posts: 105
Loc: Australia

Re: Isaac Hollis and Son 12 Bore Rifle [Re: DarylS]
#384325 - 20/04/24 08:26 AM

Thanks for that Daryl, I did finish up using 120 grains of FFg which brought the poi up to the poa at 50yds. I will have to check what ball but think it might be a .71 with a thick patch and greased felt wad over powder . You can feel the rifle twist between you hands on discharge

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Keep your horse well shod and your powder dry !

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Heelerau
.300 member

Reged: 31/01/17
Posts: 105
Loc: Australia

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#387114 - 07/10/24 07:08 AM

Update on my Hollis, the lock was repaired, springs reshaped and tempered, lock plate internals polished, works a treat. I reproofed the barrel with my usual service charge of 120 grains of FFg with greased felt wad, and tight patch with a .71 diameter ball. I then fired about 5 or 6 shots off the shoulder. Still need to pull the breach plug and give the bore a light lap as there is a bit of hard scale in the bar that needs removing. Will do a range report in due course

--------------------
Keep your horse well shod and your powder dry !

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93x64mm
.416 member

Reged: 07/12/11
Posts: 4213
Loc: Nth QLD Australia

Re: Isaac Hollis and Son 12 Bore Rifle [Re: Heelerau]
#387117 - 07/10/24 10:26 AM

YAHOO!

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DarylS
.700 member

Reged: 10/08/05
Posts: 27093
Loc: Beautiful British Columbia, Ca...

Re: Isaac Hollis and Son 12 Bore Rifle [Re: 93x64mm]
#387125 - 08/10/24 03:07 AM

Good news, Gordon.

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Daryl

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

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