Ciao, so che l'argomento è già stato trattato, ma dovendo usare google translator faccio fatica a trovarlo per verificare se ricordo correttamente quello che ho letto. Sto smistando la capacità dell'acqua su casse standard .300 WM dopo il primo colpo con primer esploso e prima di passarle sullo stampo e volevo sapere: in primo luogo se è troppo presto per eseguire questa operazione e in secondo luogo quali tolleranze accettare, 0,5 grani tra il minimo e il massimo possono andare bene o devo restringere il campo. Ultima cosa, esiste un sistema per evitare bolle d'aria rimanenti che possano compensare la misurazione? Ringrazio in anticipo chi può darmi una risposta. Mi scuso anche se il traduttore non fa bene il suo dovere.
Internal volume of cases
- Thread starter fabarm
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Hi, I know that the topic has already been dealt with, but having to use google translator I find it difficult to find it to check if I remember correctly what I have read. I am sorting the water capacity on standard .300 WM cases after the first shot with exploded primer and before passing them on the diee and I wanted to know: first if it is too early to carry out this operation and second what tolerances to accept, 0.5 grains between the minimum and maximum may be fine or I must narrow the field. Last thing, is there a system to avoid remaining air bubbles that can offset the measurement? I thank in advance who can give me an answer. I apologize even if the translator does not do his duty well.
MagnumManiac
Well-Known Member
To get accurate volume, you need to fire a case 3 times with only neck sizing the case.
This will get you an accurate water weight.
Cheers.
This will get you an accurate water weight.
Cheers.
Easy for you to say.
Ok Thanks, but what tolerance can I accept 0.5 -1 -1.5 grains between minimum and maximum as internal volume.
MagnumManiac
Well-Known Member
A 2 grain average spread is large to me.
I try for 1/2 to 1 grain average spread as max.
I actually measure volume using CC's, haven't used the water weight measurement for quite some time.
Cheers.
I try for 1/2 to 1 grain average spread as max.
I actually measure volume using CC's, haven't used the water weight measurement for quite some time.
Cheers.
Magnum: how do you measure volume in cc's precisely? You must have a very thin graduated cylinder.
MagnumManiac
Well-Known Member
I use a Burette graduated in tenths of CC's.
It's for measuring combustion chambers in model engines, intake runners etc.
Cheers.
It's for measuring combustion chambers in model engines, intake runners etc.
Cheers.
cdherman
Well-Known Member
You are better off measuring water volume with a good scale. Water has a nasty habit of forming a meniscus and making it hard to measure with a burette. Add a little soap as noted above, to kill surface tension. Or use grain alcohol and correct for the specific density.
If the OP would attempt to explain in English what he is trying to achieve, we might do better. As much as I love other languages, (and I speak German fluently) sometimes, reading the post in broken English is better than any translator.
If the OP would attempt to explain in English what he is trying to achieve, we might do better. As much as I love other languages, (and I speak German fluently) sometimes, reading the post in broken English is better than any translator.
MagnumManiac
Well-Known Member
I do not use water, just to clear that up.
Cheers.
Cheers.
kiwikid
Well-Known Member
One CC of water weighs 1 gram, multiple the CCs or grams by 15.462 and you will get the volume in grains.
