throght errotion

T

thehippy77

Guest
throat erotion

This my be old news but I am new to the br world. Is there an effect on throat erotion in relation to the length of the neck. I gess what I am asking does a longer neck slow errotion by the powder burnning in the case rather than in barrel. I may be way off here but would like any and all thoughts. thank you.
 
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Throats and Errosion

The concept of neck length and it's affects on throat errosion is probably a non issue in 100-200 yard Benchrest.........jackie
 
thehippy77,

Don't let the fact that the question is irrelevant to Jackie put you off, THIS FORUM is not all 100-200 BR. In fact 100-200yd BR is the smallest faction of even this Bench Rest forum. And plenty of folks in point blank BR are looking for ways to save their throats too.

My belief is that the length of the neck has no affect on throat erosion.

A search will turn up some posts on the subject.

Also search "turbulence point theory" or "TPT".

hth

al
 
Al

He said br world.

He also said that any and all thoughts would be appreciated.

I gave him the thoughts of a 100-200 yard Benchrest Shooter.........jackie
 
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BR world does include 600/1000 ;) And the issue does come up in regards to 100/200 but really I was just trying to reassure Mr Hippy because to me you sounded a little short or "brusque"?? maybe?? To a new guy?

In retrospect I was wrong.... I READ your post as short or brusque, in reality "pithy" and "to the point" is a better description of your reply.

My bad, sorry.

al
 
Al, Jackie wasn't brusque. The brusque answer to the original post is


No.

Remember that Turbulence Point was a theory. It started with the assumption that the 6 PPC was (1) perfect, and (2) therefore, better than anything else. From those assumptions only, the author then went on to analyze certain of the PPC characteristics.

Of course, we know that both assumptions were wrong.

There is also the long-standing example of the .243 Winchester. Turns out that the there are throat issues with a standard .243 SAAMI chamber which are more likely to explain the .243's short barrel life than the shorter neck.

On the other side, we have Al Nyus' Wolf Pup, which he reports has no more erosion than other chamberings.

And Danny Brooks, an East-coast shooter who has won more National Championships than any other single shooter, uses a .300 Winchester magnum. We keep asking him "hasn't that barrel worn out yet?" But it turns out, it wears like any other chambering of its size, and we can't sit back and hope that short barrel life will knock Danny off his throne. (Besides, he always seems to get a good barrel when he does need a new one.)

So the long answer is, "well, there are a lot of people who repeat that old saying, but no good evidence."
 
The reason I ask

A friend has came up with or stolen from somewhere a 6x284 shortend by about .300 with a realy long neck. He has data and I have personaly seen this thing push 107smk at 3250 with as he clames almost no thoat wear at 1500-2000 rounds. I have not seen this to be true with a bore scope but it still shoots in the ones. Alinwa what kind of barrel life are you getting out of the 6x47l with the heavy bullets. thanks you
 
thehippy77 said:
Alinwa what kind of barrel life are you getting out of the 6x47l with the heavy bullets. thanks you
Click to expand...

Hippy I don't know. I've got less than 700rds through my first barrel. Just yesterday I loaded a round set to the "jamset length" from my notes when the barrel was new and it pulled the bullet...... What I mean is that when the barrel was brand new I'd seated a bullet long and let the actual lands of the barrel "jam" the bullet back to a length. Then I carefully eased the round back out using nose pressure from a cleaning rod and light pressure on the bolt handle. This "jamset" is so long that at the time I would not use it for competition for fear that if I had to unload for a cease fire the bullet would be left stuck in the bore.

The match load that I've been shooting is set back .040 from the (then) lands, it's "jumping 40 thousandths"....... so I decided to check my jamset again, find out how far the lands had eroded. They hadn't. The bullet jammed, stuck in the rifling lands and when I pulled the bolt back I dumped powder all down in my gun. I went through a whole sequence to find the lands and found them to be unmoved. The imprints of the lands left on the bullet were a little rounded off on the corners but that's all. I don't have a borescope.

Most of the rounds through this rifle have been 108gr 6mm's right at 3150fps. It shoots quite well. It will do about 3225 before it starts to really pressure up but I found accuracy at 3150fps. The round is very efficient.

I hope this is clear.

Good answer Charles....:)

al
 
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