Proof or pudding?

[Guest cookoff013]

Ok guys.....

 

A few of you guys know about some of my recent projects. But i would like to point out to every one here who reloads that caution should be always taken. Recently i have been taking loads to the proofhouse to be analysed.

[back story- ] Previous to this i purchased a powder that i thought would be decent for 12gauge ammunition.

 

following on from the previous good results i have received, i decided to follow up with some more loads to add to the data set so this powders characteristics can seen, ie speeds, variability, maximum / minimum payload.... etc.

 

i selected 3 variables of powder charge, fibre and plastic waddings and also different lead weights. One of the loads i went completely off piste with, but its why they are to be analysed.

 

first of all when i got the results, the ones i was expecting ¬safe¬ ,they were complete and utter failures at proof. Way over pressure. i was shocked at this because i was expecting the pressures to be lower, ALOT lower.

 

But the startling thing was, the shell that i was expecting to completely be sky high, actually sailed in nice and safe and with a brilliant speed.

 

Now, apart from being extremely embarrassing, i have a greater understanding of this powder. The failed data will never be published (i`ve a nice collection now). but it is useful to Know, then adjust the load accordingly to re analyse

 

so i urge any reloader, if you have any doubts or any issues. please send some ammunition off to be tested. it will remove doubts.

i shall be updating some more information soon. i need 10 minutes to do that.

 

cook.

 

PS

I set my self some goals a while ago.one of them i have just surpassed. my goal was to have 1000 shells per Kg of powder. it was an economical goal, not speed or payload.

 

In the first instance i shall be doing a Powder bushing chart for powder. this i hope will help reloaders USE or PURCHASE the correct bushing or a range of bushings.

 

I would also re-iterate that you must weigh your own powder charges, not relying on some MUPPET on TINTERETS. you are responsible for your own reloads.

[mereside]

very interesting indeed ,do you know why the ones that you thought would be ok went over pressure was it the same powder just with different components and powder/shot charge i would be interested to here your thoughts,

this is the reason i would never let anyone reload for me as too many things to go wrong whilst your the one on the recieving end.

better to start with known charges and work to suite your your rifle shotgun or whatever you are loading for than listen to others that have loads working for there combo ,its frightening when you here or see what people can and will do, atb wayne

[Guest cookoff013]

very interesting indeed ,do you know why the ones that you thought would be ok went over pressure was it the same powder just with different components and powder/shot charge i would be interested to here your thoughts,

this is the reason i would never let anyone reload for me as too many things to go wrong whilst your the one on the recieving end.

better to start with known charges and work to suite your your rifle shotgun or whatever you are loading for than listen to others that have loads working for there combo ,its frightening when you here or see what people can and will do, atb wayne

 

Yeah, i do know why the loads went over pressure. from the evidence that has been created its clear there is a correlation, I will be adjusting my next batch of proof loads accordingly. what i have worked out is that i have a whole heap of failures, adjust my loadings, then more and more pass. only when i try and push it, or go off piste is where some failures are, crazy thing is some successes come out of that too. i`d like to proof a hell of alot more, it costs money and time.

[mereside]

what does it cost to send them to proof and do you have to send a minimum qauntity?, atb wayne

[Guest cookoff013]

It is quite simple, you manufacture either 10shells or 5shells + 5shells, make an appointment to the proof house, have a declaration sheet ready, and ask for the service that you want. i opted for the standard proof thats 740bar for normal 12gauge.

 

then you should be sent a bill in the post. you pay the bill. then the results turn up in the post. a nice lab report. lots of numbers, and a summary.

 

edit, it cost £40 inc vat for 10 shots.

Edited September 27, 2013 by cookoff013

[Guest cookoff013]

I would like to purvey my results from a Powder drop weight check. This is to be used as a "rough" bushing guide for the powder "nobelsport Ba10". How i created this drop check is with a single stage MEC Sizemaster reloader, the sequence was shake 3 times, drop and weigh. This drop check list is unadulterated so it is not like the manufacturers Bushing powder drop charts where the weights dropped are light.
This powder is very dense, small kernel, and meters great. The drops vary little.

For the bushings i have not got, I ran the data through an excel graph and filled in the blanks. these are marked as "guesstimated". That is a fancy word for "i guessed". if you look at the numbers (which i didn't notice) each bushing advancement is +0.6 grain throughout the bushings i have.

This information is to help loaders, as to what bushings to potentially get. I strongly advise all loaders weigh powder and shot weights.

Ba10 powder
MEC bushing / Grain

#21 - (12.6) guesstimated

#22 -13.2
#23 - (13.8) guesstimated
#24 -14.6
#25 -15.2
#26 -15.8
#27 - (16.4) guesstimated
#28 -17.0
#29 -17.6
#30 - 18.2
#31 - (18.7) guesstimated
#32 -19.2

[Guest cookoff013]

12-70mm

cx2000

15 grains nobelsport Ba10 (fifteen)

Gualandi Superspark Plaswad

28grams #6 Lead shot

8 point crimp

 

399 m/s

528 BAR

momentum 11Ns

 

please enjoy this data responsibly.

 

the one amazing fact about this load, even with such a small powder charge, it still is at standard speeds.

[pestcontrol1]

:good: