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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

mauserand9mm
.400 member

Reged: 03/09/09
Posts: 1040
Loc: Queensland, Australia

Re: CZ 550 in 505 Gibbs
30/03/11 11:48 AM

The hangfires in the Jeffery sound like they were possibly underloaded (they were mentioned as being reloads). Large cases with too much unoccupied space can do this - I had these dramas with reduced cast loads in my 458. There is also a risk of pressure excursions if this happens with a slow burning powder. The pressure wave bounces up and down the case and adds to itself at the ends and can put "rings" in the steel of the chamber or possibly even blow apart the rifle (haven't heard of local cases of the latter though). This pressure increase effect is well known in the gas industry and is known as "pressure piling", and there are standard measures generally employed to prevent it occurring.

I also found out a bit more about the CZ Custom Magnum model. The difference from the standard Safari Magnum are – they have a barrel band sling mount, #1 Fancy Grade (?) American Walnut timber and are glass-bedded. The Jeffery and Gibbs also have mercury recoil reducers fitted. This equates to the extra $1,500, or thereabouts, that they cost over the standard magnum.

I was interested in the Jeffery as it is lower in power than the Gibbs. A 500NE would meet the requirements for BGR group 3 and the Jeffery is next closest for a bolt gun.

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Subject	Posted by	Posted on
CZ 550 in 505 Gibbs	Empire375	29/03/11 07:28 PM
Re: CZ 550 in 505 Gibbs	fourbore	03/04/11 07:24 PM
Re: CZ 550 in 505 Gibbs	Ben	03/04/11 07:43 PM
Re: CZ 550 in 505 Gibbs	chuck375	04/04/11 07:40 AM
Re: CZ 550 in 505 Gibbs	Empire375	04/04/11 10:07 AM
Re: CZ 550 in 505 Gibbs	500grains	29/03/11 09:08 PM
Re: CZ 550 in 505 Gibbs	FATBOY404	29/03/11 09:26 PM
Re: CZ 550 in 505 Gibbs	mauserand9mm	29/03/11 10:15 PM
Re: CZ 550 in 505 Gibbs	450_Ackley	30/03/11 07:33 AM
Re: CZ 550 in 505 Gibbs	FATBOY404	30/03/11 07:39 AM
Re: CZ 550 in 505 Gibbs	450_Ackley	30/03/11 08:19 AM
Re: CZ 550 in 505 Gibbs	Empire375	30/03/11 10:26 AM
Re: CZ 550 in 505 Gibbs	500Nitro	30/03/11 10:32 AM
Re: CZ 550 in 505 Gibbs	Empire375	30/03/11 10:57 AM
Re: CZ 550 in 505 Gibbs	500Nitro	30/03/11 11:09 AM
Re: CZ 550 in 505 Gibbs	mauserand9mm	30/03/11 11:48 AM
Re: CZ 550 in 505 Gibbs	500Nitro	30/03/11 11:51 AM
Re: CZ 550 in 505 Gibbs	NitroX	30/03/11 12:10 PM
Re: CZ 550 in 505 Gibbs	450_Ackley	30/03/11 12:27 PM
Re: CZ 550 in 505 Gibbs	mauserand9mm	30/03/11 12:40 PM
Re: CZ 550 in 505 Gibbs	500Nitro	30/03/11 12:31 PM
Re: CZ 550 in 505 Gibbs	NitroX	30/03/11 01:32 PM
Re: CZ 550 in 505 Gibbs	500Nitro	30/03/11 01:36 PM
Re: CZ 550 in 505 Gibbs	450_Ackley	30/03/11 01:55 PM
Re: CZ 550 in 505 Gibbs	500Nitro	30/03/11 02:05 PM
Re: CZ 550 in 505 Gibbs	450_Ackley	30/03/11 03:15 PM
Re: CZ 550 in 505 Gibbs	500Nitro	30/03/11 03:44 PM
Re: CZ 550 in 505 Gibbs	NitroX	30/03/11 04:07 PM
Re: CZ 550 in 505 Gibbs	450_Ackley	30/03/11 05:18 PM
Re: CZ 550 in 505 Gibbs	NitroX	31/03/11 03:06 AM
Re: CZ 550 in 505 Gibbs	chuck375	31/03/11 07:22 PM
Re: CZ 550 in 505 Gibbs	Ben	31/03/11 08:03 PM
Re: CZ 550 in 505 Gibbs	chuck375	31/03/11 11:54 PM
Re: CZ 550 in 505 Gibbs	fourbore	03/04/11 07:11 PM
Re: CZ 550 in 505 Gibbs	500Nitro	31/03/11 05:03 AM
Re: CZ 550 in 505 Gibbs	Ben	31/03/11 08:10 AM
Re: CZ 550 in 505 Gibbs	500Nitro	31/03/11 08:13 AM
Re: CZ 550 in 505 Gibbs	mauserand9mm	30/03/11 04:35 PM
Re: CZ 550 in 505 Gibbs	FATBOY404	30/03/11 12:39 PM

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