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[quote="ovenpaaThe thing is if it fires once it is always OK afterwards so I am starting to think it has to be something in the forming process.[/quote]


Yep, that's where my thinking is heading. If once formed there is no issue, it could be that the mis-fires are literally just part of the forming. Once you've had a misfire, do you always pull the round, or have you given it another try in the gun?

Trying it in another rifle is not an option as I doubt there is another one with this chamber in the country.

Taking my RCO's hat off for a minute, if someone in a say a foreign country was to curse, remove and rotate the round and try again it still would not fire..

Are you not supposed to that in the UK? :?

Part of the RCO course covers misfires and they very clearly state you should never re chamber the round and attempt to fire it a second time.

Did they give you any explanation why? Just curious....

Sim G wrote:Did they give you any explanation why? Just curious....

Unfortunately we have had several accidents here where mis-fires have been re-chambered, hence the 'no no' attitude. What apperntly happened in all cases was that, once struck, the primers were slightly dislodged and the second strike fired them but the blast came backwards. I was actually on the firing point next to one of these and the guy was in very poor shape as they carted him off to a burns unit!

A lot of these things are as a result of accidents on ranges. Fortunately they are very rare nowadays but we still teach absolute safety in all respects - duty of care etc.

Heather

Sim G wrote:

Robin128 wrote:Doesn't light strike say more about the rifle than the primers?

I tend to agree. That's not to say you don't get bad primers, far from it. But in the numbers Dave is talking about, in excess of 22, I'd say the rifle needs looking at......

The rifle? more likely the fire forming practise. The poor extractor was probably to bear the whole
of the bolw!!!

Ovenpaa, try again with your now fore formed cases..

To reply your question; with 1,60mm fiameter FP tips, protrusion is 1,4-1,5mm.
With 2mm tips, it is 1,6mm.

R.G.C

R.G.C wrote:Ovenpaa, try again with your now fore formed cases..

To reply your question; with 1,60mm fiameter FP tips, protrusion is 1,4-1,5mm.
With 2mm tips, it is 1,6mm.

R.G.C

Thank you for that Robert, the firing pin measures at 1.58mm so the protrusion of .053" is 1.34mm - so at the lower limit but I would still expect it to be OK. I have built the cases again with CCI LR primers which are slightly softer and with a .020" jam so I expect everything to work come Wednesday when I test.

We went back to Bisley with a slightly longer COAL and most of them went bang so that seems to have done the trick.

Told you!



Hang on...most of them????

:evil: :roll: