12 gauge 67mm once fired cases

[MAB1954]

Hi.

 

I spoke to Clay & Game today looking for data for reloading once fired 12 gauge 67mm PTcases, all Eley brand. They could not provide any data, I was surprised I would have paid for data plus I have bought quite a bit of stuff from them and recently put in an order for collection at the Scottish Game Fair.

 

So my question is does anyone reload 12 gauge 67mm cases and could anyone give me some data for 24 gram clay load using lead shot size 7.5.

 

The clay load I have been loading to date is:

 

70mm PT once fired cases

CX 2000 Primer

Vectan AS Powder

T2 Wad

Lead shot 24 grams size 7.5

Crimp closure

 

The above components will not fit into a 67mm case. I only reload cases once then bin them. I have quite a lot of 67mm cases that I would like to use. Thanks in advance for any data provided, PM me if you prefer.

Edited May 8, 2014 by MAB1954

[sitsinhedges]

Even though I am of the belief that using a shorter case does increase breech pressures to a greater or lesser extent because there is less room inside the case for the expanding gases to initially expand into before the crimp opens, and this is probably why smaller gauges need a slower powder too, I would replace the T2 which probably has a column height of 27mm for the B&P Z24 as long as you weren't already pushing the boundaries pressure wise. I don't think AS is a particularly hot powder for 24 gram loads so unless you are putting a lot in the pressures probably aren't that high.

[deershooter]

Even though I am of the belief that using a shorter case does increase breech pressures to a greater or lesser extent because there is less room inside the case for the expanding gases to initially expand into before the crimp opens, and this is probably why smaller gauges need a slower powder too, I would replace the T2 which probably has a column height of 27mm for the B&P Z24 as long as you weren't already pushing the boundaries pressure wise. I don't think AS is a particularly hot powder for 24 gram loads so unless you are putting a lot in the pressures probably aren't that high.

Done this many times

 

+1

 

Deershooter

[Andy H]

Here is some.

 

http://www.nobelsport.it/public/pages/ENG/schedapol.asp?ProdottoID=557&FamigliaID=0

Vectan AS.pdf

Edited May 8, 2014 by Andy H

[Guest cookoff013]

my ba10 will probably do 24 grams in a 65mm hull.

 

thats what i`ve come to realise.my test load that only just failed had 2x powdercards and a 20mm fibre to just get a 24 gram load right height. it failed by the statistical, but the average pressure was just in the limit (and i mean just in).

 

i would think about knocking off the powder charge 0.5grain minimum, or 1 grain, as the original load in a 70mm case used 2x powdercard, going to 65mm i could easily knock off a powdercard. i am "less" concerned about pressure, because i`m taking out a non compressible section. so the pressures may be near identical like for like (i hope).

 

i`ve not got round to testing or proofing the load yet, but its on the list to be done, i did this because i wanted a fibre version and my 70mm 28gram and 24gram loads have been good. especially the 24gram.

 

ba10 is a dense powder, i did do a drop chart, and i can honestly say, it doesnt take much to get stuff going. currently i`m testing a 13grain load / 70mm and should be subsonic/ just over. thats 1250 shells per KG.

 

i`ve slowed down proofing loads, i just need time off work to go and visit, get stuff done, review data / notes, bang off some loads and have a good hard think.

[MAB1954]

Thanks for data and advice, all appreciated.

[Field Shooter]

I have some data for 2inch & 2.5inch hulls using Bullseye, International, Titewad & Universal powders if your interested PM me your email address and Ill send it to you, I was going to post it on here but the pdf file is too large.