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

400NitroExpress
.400 member

Reged: 26/11/03
Posts: 1154
Loc: Lone Star State

Re: .458wm
28/11/04 10:11 AM

4seventy:

I read Wright's book long after having done load development in .450/.400 3 1/4", .450/.400 3" and .470 and and seem to remember being surprised at some claim he made about Kynoch ammo in the big nitros running way below listed velocity, as this had not been my experience at all. Did he say 80 to 100 fps? I liked his book so much that I gave my copy away. Your reminding me of this prompted me to go find some of my old notes.

When beginning load development in any particular nitro double, I always fired original Kynoch in it to establish a base line. I was impressed at how predictable the old Kynoch was relative to listed velocity and two variables, barrel length and priming compound, in all three calibers. Corrosive primed Kynoch from the '50s was consistently 20 to 40 fps faster than non-corrosive stuff from the late '60s and early '70s (Original Kynoch ammo is marked on the box with a date code showing month/day/year). Corrosive stuff usually ran right at listed velocity in 28" barrels (as mentioned, standard velocities were usually taken from 28" barrels, sometimes even 30"). It was my impression that Cordite was particularly sensitive to barrel length. Shorter barrels gave slower velocities as expected - seems to me to be roughly 25 fps loss for 2" of barrel.

Here are a few samples.

Watson Bros. .450/.400 3 1/4" (listed vel. 2150); 28" barrels.
Corrosive, 1953 -----------------------2141
Non-corrosive, 1968 ------------------2105

Wilkinson .450/.400 3 1/4"; 24" barrels
Corrosive, 1953 -----------------------2094
Non-corrosive, 1968 ------------------2060

Hollis .450/.400 3" (listed vel. 2125); 26" barrels
Corrosive, 1956 -----------------------2094
Non-corrosive, 1972 ------------------2070

Rigby .470 (listed vel. 2125); 26" barrels
Corrosive, 1956 -----------------------2110
Non-corrosive, 1972 ------------------2076

I've never had the occasion to try original Kynoch in a .450 3 1/4" but I have no problem believing that Kynoch from the old days (the corrosive primed stuff) actually gave 2150 in the 28" barrels that many of the original .450s had.
-----------------------------------

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"Serious rifles have two barrels, everything else just burns gunpowder."

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Subject	Posted by	Posted on
.458wm	PP_skåne	23/07/04 09:24 AM
Re: .458wm	atkinson6	13/10/04 12:23 PM
Re: .458wm	ThomasEdwards	27/11/04 12:51 PM
Re: .458wm	mickey	23/07/04 11:17 AM
Re: .458wm	Geronimo	24/07/04 07:39 AM
Re: .458wm	mickey	25/07/04 11:34 AM
Re: .458wm	Ingwe	26/07/04 01:26 PM
Re: .458wm	atkinson6	28/07/04 06:12 AM
Re: .458wm	mickey	28/07/04 09:20 AM
Re: .458wm	Ingwe	28/07/04 09:49 AM
Re: .458wm	Con	29/07/04 01:21 PM
Re: .458wm	Ingwe	29/07/04 01:28 PM
Re: .458wm	PP_skåne	30/07/04 11:34 AM
Re: .458wm	DUGABOY1	08/08/04 03:07 AM
Re: .458wm	4seventy	27/11/04 11:08 AM
Re: .458wm	PP_skåne	10/08/04 07:14 PM
Re: .458wm	DUGABOY1	12/08/04 03:10 AM
Re: .458wm	4seventy	30/11/04 01:06 AM
Re: .458wm	PP_skåne	12/08/04 09:13 AM
Re: .458wm	4seventy	12/08/04 08:41 AM
Re: .458wm	400NitroExpress	28/11/04 10:11 AM
Re: .458wm	4seventy	28/11/04 03:52 PM
Re: .458wm	DUGABOY1	13/08/04 02:37 AM
Re: .458wm	4seventy	14/08/04 09:18 AM
Re: .458wm	DUGABOY1	14/08/04 11:24 PM
Re: .458wm	4seventy	15/08/04 08:13 AM
Re: .458wm	DUGABOY1	15/08/04 11:07 AM
Re: .458wm	atkinson6	04/09/04 05:06 AM
Re: .458wm	wombat	05/09/04 03:04 PM
Re: .458wm	DONOTDELETE	06/09/04 02:03 PM
Re: .458wm	mickey	07/09/04 03:22 AM
Re: .458wm	Will	20/09/04 10:06 AM
Re: .458wm	atkinson6	29/09/04 05:08 AM
Re: .458wm	atkinson6	19/09/04 03:00 AM
Re: .458wm	wombat	27/11/04 11:48 AM
Re: .458wm	mudbug	30/10/04 06:39 PM
Re: .458wm	cooch	19/09/04 10:59 PM
Re: .458wm	Will	06/09/04 05:43 AM
Re: .458wm	mudbug	05/09/04 12:59 PM
Re: .458wm	Will	05/09/04 02:11 PM
Re: .458wm	jgttechjunkie	05/09/04 06:10 AM
Re: .458wm	4seventy	13/08/04 07:44 AM
Re: .458wm	PP_skåne	13/08/04 08:28 AM
Re: .458wm	4seventy	13/08/04 04:59 PM
Re: .458wm	PP_skåne	15/08/04 03:14 AM
Re: .458wm	4seventy	15/08/04 09:04 AM
Re: .458wm	Con	12/08/04 01:22 PM
Re: .458wm	4seventy	11/08/04 08:24 AM
Re: .458wm	DUGABOY1	11/08/04 02:42 AM
Re: .458wm	PP_skåne	11/08/04 07:59 AM
Re: .458wm	DUGABOY1	12/08/04 02:17 AM
Re: .458wm	4seventy	08/08/04 08:39 AM
Re: .458wm	DUGABOY1	09/08/04 03:26 AM
Re: .458wm	4seventy	09/08/04 05:10 PM
Re: .458wm	DUGABOY1	10/08/04 12:54 AM
Re: .458wm	4seventy	11/08/04 08:21 AM
Re: .458wm	4seventy	10/08/04 08:33 AM
Re: .458wm	Ingwe	10/08/04 03:54 AM
Re: .458wm	4seventy	09/08/04 04:58 PM
Re: .458wm	jgttechjunkie	08/08/04 09:55 AM
Re: .458wm	Ingwe	08/08/04 06:47 AM
Re: .458wm	PP_skåne	23/07/04 06:13 PM

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