TR chamber dimensions problem?

[johngarnett]

I'm now worried about even shooting my two stickered rifles wtfwtf

At least my target shotgun is safe -------or is it? I bought S&B slug from the NRA sign85

JohnG :cornwall:

[John MH]

Some more... Allready posted above, oohps.

Is it being purported that there are quite a few potentially 'dangerously chambered rifles' in use at TR meetings that could suffer from overpressure stress as a result of a ‘short throat’?

[rox]

Some more...

Is it being purported that there are quite a few potentially 'dangerously chambered rifles' in use at TR meetings that could suffer from overpressure stress as a result of a ‘short throat’?

This is incidentally the same link as in post 3 of this thread.

I don't think anyone really knows how many , how short, or how dangerous at this time.

But surely the only impact of a shorter throat is to bring the leade closer to the bullet, thereby reducing jump. While the stickering test (inked bullet) doesn't take into account reduced throat *diameter*, it does verify the jump, albeit a little crudely, and should therefore preclude problems due to reduced throat length. Bearing in mind also that typical TR pressures are way below those of our MR and F Class brethren, there should also be a fair margin in well-made rifles.

..

[John MH]

Ah, didn't spot that.

Not a problem for a well made modern rifle and a competent handloader who develops a load for a rifle while watching for the signs of overpressure.

Is it possible that this could be an issue for an unsuspecting TR owner who chambers something other than a 155 grain RWS/RG/RUAG round?

[rox]

Is it possible that this could be an issue for an unsuspecting TR owner who chambers something other than a 155 grain RWS/RG/RUAG round?

Not an easy question to answer conclusively, but unless the ammo batch has been CIP tested you are on your own anyway. And bear in mind that at proof time the rifle will have fired an over-pressure round that is presumably made towards the upper limits of CIP dimensions, and from that point onwards the throat erodes, gradually getting bigger.

..

[Steve E]

As far as I am aware there have been over 7 million rounds of RUAG shot through these supposedly short chambered Target Rifles with no problems. There for the problem probably does not exist. All a bit of a storm in a tea cup driven by someone who did not really know what he was talking about.

[karen]

Firstly the issue of Pizer's resignation was not down to Rule 150. It was the final straw in a long list of occurrences which I am not going to debate on a public forum (especially as some really lovely person reported my last factual statement on here about cheating to certain people at the NRA - nice to have friends isn't it! :roll: )

Oddly I do not remember seeing that particular letter from Pizer before however there has been so much correspondence that I may have missed it.

At the 8 Feb and 1 March meetings the Trustees were tasked by General Council with investigating Rule 150 to make sure everything was in order and that is what they are doing as far as I know.

The statement on the NRA website will probably get everyone worried about whether their rifles are compliant or not - one statistic that is very important in all this is that somewhere between 7 and 10 MILLION rounds have been fired since the 1999 Proof House memorandum with no incidents. The only incidents of reported injury during this time have involved handloads.

STOP WORRYING! There is no conspiracy and no danger - Pizer may want you to believe otherwise but he would wouldn't he!

We now have a great Chairman in John Webster - for the first time in my 10 years on General Council I feel we have a safe pair of hands in charge.

Love

Karen

[rox]

As far as I am aware there have been over 7 million rounds of RUAG shot through these supposedly short chambered Target Rifles with no problems. There for the problem probably does not exist. All a bit of a storm in a tea cup driven by someone who did not really know what he was talking about.

The fact that nothing has happened yet doesn't mean there isn't a potential problem. Last year there were thousands of problems when primers started popping out. That had a different cause, but serious issues often arise when two or more otherwise minor issues combine, and reduction or removal of the safety margin would certainly qualify as one of them. As I understand it we will be seeing some different factory ammo in use on certain occasions this year, so that presents a whole new set of variables: different bullet shape, different brass thickness and strength etc etc.

..

[IainWR]

Some more...

Is it being purported that there are quite a few potentially 'dangerously chambered rifles' in use at TR meetings that could suffer from overpressure stress as a result of a ‘short throat’?

This is incidentally the same link as in post 3 of this thread.

I don't think anyone really knows how many , how short, or how dangerous at this time.

But surely the only impact of a shorter throat is to bring the leade closer to the bullet, thereby reducing jump. While the stickering test (inked bullet) doesn't take into account reduced throat *diameter*, it does verify the jump, albeit a little crudely, and should therefore preclude problems due to reduced throat length. Bearing in mind also that typical TR pressures are way below those of our MR and F Class brethren, there should also be a fair margin in well-made rifles.

..

The stickering test is no longer done with an inked bullet. An OAL guage with a real .308" bullet is pushed into the leade until it makes solid contact. The resulting OAL is measured with a caliper and if it is under limit (2.800") the rifle fails. Under limit can occur because the chamber is too short (bullet can't go far enough forward) or because the chamber is too narrow (bullet sticks before parallel portion of the bullet reaches the equivalent parallel portion of the chamber). So either way, the rifle fails, and you have to find an expert to tell you why and to fix it.

[karen]

General Council is made up of YOUR representatives - here is the statement from the NRA website (11 Feb) (just in case some "nice friend" decides to report me for breaking GC confidentiality again!)

Members of General Council held a Special Meeting on Saturday 8th February 2014 to consider the background to the recent resignation of Dr Robin Pizer as Chairman of the Association.

The meeting was attended by Dr Pizer and the NRA Trustees; commenced at 11.00am and was
concluded at 3.45pm.

Members of General Council recognised that both Dr Robin Pizer and the Association’s Trustees had
received a fair and impartial hearing at the meeting; and voted to accept the resignation of Dr Robin
Pizer as Chairman of the Association (28 in favour, 4 against, 2 abstentions).

After GC heard ALL the evidence (most of which had nothing to do with Rule 150) I think the results speak for themselves!

Love

Karen