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#577532 - 08/11/20 10:03 AM Dacron vs. backing rod
justin Offline
Sidelock
**

Registered: 11/03/06
Posts: 609
What is the ballistic difference between Dacron stuffing and backing Rod in loading smokeless for black large caliber cartridges?
Is there any difference?

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#577542 - 08/11/20 11:48 AM Re: Dacron vs. backing rod [Re: justin]
dearmer Offline
Boxlock

Registered: 12/31/06
Posts: 16
They both work great in my opinion. I find that backer rod is the easier of the two to use, especially in the straight walled cases. Just buy a size that is slightly larger than the case size and cut a length about 1/4 inch longer than the air space you have in the case. Stick it in, seat the bullet, and done. With Dacron it's harder to get the same amount measured out so you can have consistency from round to round. I think the backer rod is cleaner on the range as well. The dacron can make kind of a mess.

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#577543 - 08/11/20 11:51 AM Re: Dacron vs. backing rod [Re: dearmer]
dearmer Offline
Boxlock

Registered: 12/31/06
Posts: 16
Sorry. I missed "ballistic" in your question. I don't notice one. If you were using a slower burning powder than most do however you can compress the Dacron more which might help in that scenario.

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#577547 - 08/11/20 12:36 PM Re: Dacron vs. backing rod [Re: justin]
justin Offline
Sidelock
**

Registered: 11/03/06
Posts: 609
Thank You dearmer
My concern is whether the backing rod seals the charge behind the bullet as well as the Dacron

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#577549 - 08/11/20 12:57 PM Re: Dacron vs. backing rod [Re: justin]
dearmer Offline
Boxlock

Registered: 12/31/06
Posts: 16
I'm assuming you're using lead and worried about gas cutting? I honestly don't know. My guess would be that the Dacron would be better in that regard but the backer rod is so cheap and easy why not just shoot a few groups and see?

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#577554 - 08/11/20 02:27 PM Re: Dacron vs. backing rod [Re: justin]
WBLDon Offline
Sidelock

Registered: 09/16/13
Posts: 282
Loc: Minnesota
Please excuse my ignorance but what is "backer rod" and where do you get it? I have used dacron for years without an issue.

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#577557 - 08/11/20 03:19 PM Re: Dacron vs. backing rod [Re: justin]
HalfaDouble Offline
Sidelock

Registered: 10/18/16
Posts: 121
WBLDon, you must be lucky. Charlie Dell in his Modern Schuetzen Rifle performed extensive testing on chamber ringing. This ringing had first been noted by the Frenchman who had developed smokeless powder and was reported later by Major Sir Gerrald Burrard in British shotgun chambers. In Dell's testing he found he could ring a chamber at will using dacron holding the powder to the rear of the case. The ring would form gradually at the base of the bullet. Depending on the quality of the barrel steel it might take 6 to 30 shots to form to the point that it was hard to remove the case from the chamber. He also did it using a thin cork wad on the powder. A thin cork wad off the powder by .20 or so did less damage but was still a factor. Kapok seemed to cause less problems than dacron. At one point he even discovered that he could ring the chamber with no filler/wad at all just by shooting straight up. The problem was that a high intensity pressure wave formed on a level surface of powder and propagated to the base of the bullet. The same powder spread out in the case was no problem. A full case of powder was no problem and a case completely filled with something like cream of wheat or corn meal over the powder was also no problem.

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#577561 - 08/11/20 07:18 PM Re: Dacron vs. backing rod [Re: justin]
BrentD Offline
Sidelock
**

Registered: 01/21/04
Posts: 5050
Loc: Iowa
Charlie's experiments were a bit curious. Note that shotgun wads do exactly the same thing as dacron. Same fast powder too.
_________________________
_________
...never pay Dave "one more dime"

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#577566 - 08/11/20 08:49 PM Re: Dacron vs. backing rod [Re: justin]
craigd Offline
Sidelock
**

Registered: 02/18/09
Posts: 6859
I thought the problem could occur if wadding was used over powder, with an air space to the bullet base? The shotgun shell concept may not be the same as using a reduced volume smokeless load for cartridges originally loaded with black powder?

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#577567 - 08/11/20 08:56 PM Re: Dacron vs. backing rod [Re: justin]
BrentD Offline
Sidelock
**

Registered: 01/21/04
Posts: 5050
Loc: Iowa
craig, it may not be the same, but what part of the explanation for Dell's conclusions don't apply to shotguns? The laws of physics, etc. don't change.

I and a few friends have been loading bpcr cartridges with light loads of Unique, 4227, and similar powders, then pushing 3/8" of fine-pore floral foam over the powder until it crushes. This also holds the powder on the primer and creates a sizable amount of space to the lead bullet. Accuracy is greatly improved in most cases. No problems have been reported.
_________________________
_________
...never pay Dave "one more dime"

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