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Double Rifles, Single Shots & Combinations >> Double Rifles

Bill_Cooley
.300 member

Reged: 14/12/06
Posts: 197
Loc: Fort Worth, Texas

Re: Foam Filler = Ruined barrels ?
29/04/08 01:19 PM

I posted this on Accuratereloading.com on the same post on using filler and blowing up his Krieghoff barrels. I don’t think he used enough filler to take up all the space and got the results G Wright talked about the base of the bullet acted like a secondary obstruction in the chamber/ barrel.
Hear is my other post.

I have read this thread and found it quite interesting. I read up on this phenomena back when I was starting to reload as I was using a filler over the powder in my old 45-70 trapdoor and was afraid of damaging it. Charlie Dell’s work was helpful in understanding the problem. A problem I didn’t know existed until a friend cautioned me about it.
I think the problem is caused by the pressure front caused by the rapidly expanding gasses of the burning powder. With a over powder wad this becomes a part of the pressure wave hitting the back of the seated bullet resulting in the barrel obstruction syndrome. This is why filling ALL THE SPACE is important. This retards the pressure wave enough that you don’t have a problem. Uniform ignition is just a happy by product of doing this.
“Federal factory 470 ammo sometimes has large variation in velocity due to the position of powder in the case when the trigger is pulled.”
I wonder what would happen if you pulled some of these and used a foam filler as Kynoch does and see if it helps.
Bill[

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Subject	Posted by	Posted on
Foam Filler = Ruined barrels ?	Westley375	19/04/08 01:56 AM
Re: Foam Filler = Ruined barrels ?	new_guy	19/04/08 08:15 AM
Re: Foam Filler = Ruined barrels ?	new_guy	19/04/08 08:16 AM
Re: Foam Filler = Ruined barrels ?	DUGABOY1	19/04/08 09:17 AM
Re: Foam Filler = Ruined barrels ?	DarylS	19/04/08 09:30 AM
Re: Foam Filler = Ruined barrels ?	Rolland	19/04/08 03:53 PM
Re: Foam Filler = Ruined barrels ?	JabaliHunter	19/04/08 09:06 PM
Re: Foam Filler = Ruined barrels ?	new_guy	19/04/08 10:38 PM
Re: Foam Filler = Ruined barrels ?	DarylS	20/04/08 01:48 AM
Re: Foam Filler = Ruined barrels ?	CptCurl	19/04/08 09:05 PM
Re: Foam Filler = Ruined barrels ?	9.3x57	19/04/08 10:45 AM
Re: Foam Filler = Ruined barrels ?	Ripp	28/04/08 07:52 AM
Re: Foam Filler = Ruined barrels ?	DarylS	28/04/08 08:30 AM
Re: Foam Filler = Ruined barrels ?	9.3x57	28/04/08 11:12 PM
Re: Foam Filler = Ruined barrels ?	Ripp	28/04/08 11:20 PM
Re: Foam Filler = Ruined barrels ?	9.3x57	28/04/08 11:47 PM
Re: Foam Filler = Ruined barrels ?	DarylS	29/04/08 01:30 AM
Re: Foam Filler = Ruined barrels ?	Bill_Cooley	29/04/08 01:19 PM
Re: Foam Filler = Ruined barrels ?	Ripp	29/04/08 10:51 PM
Re: Foam Filler = Ruined barrels ?	DarylS	30/04/08 01:18 AM
Re: Foam Filler = Ruined barrels ?	Bill_Cooley	30/04/08 12:47 PM
Re: Foam Filler = Ruined barrels ?	Ripp	30/04/08 09:39 PM
Re: Foam Filler = Ruined barrels ?	450_366	30/04/08 10:21 PM
Re: Foam Filler = Ruined barrels ?	REN3	01/05/08 12:17 AM
Re: Foam Filler = Ruined barrels ?	DarylS	01/05/08 03:06 AM
Re: Foam Filler = Ruined barrels ?	DUGABOY1	28/04/08 01:36 AM
Re: Foam Filler = Ruined barrels ?	CptCurl	19/04/08 10:45 AM
Re: Foam Filler = Ruined barrels ?	NitroX	19/04/08 02:25 AM
Re: Foam Filler = Ruined barrels ?	9.3x57	19/04/08 02:34 AM
Re: Foam Filler = Ruined barrels ?	Anonymous	19/04/08 05:17 AM
Re: Foam Filler = Ruined barrels ?	Huvius	19/04/08 05:27 AM
Re: Foam Filler = Ruined barrels ?	Anonymous	19/04/08 05:28 AM
Re: Foam Filler = Ruined barrels ?	Paatti	19/04/08 05:51 AM
Re: Foam Filler = Ruined barrels ?	500Nitro	19/04/08 02:21 AM

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