Trimming cases for B.S.

Discussion of BPCR loading techniques, SAFETY, Case Cleaning and Prep, Indexing, BP Choice, Primers, Wads, Compression, Drop Tubes, Vibration, Load Testing, etc.
Singleshot S.A.
PostsCOLON 81
JoinedCOLON Sun Aug 30, 2015 6:19 pm
LocationCOLON Adelaide. Sth Oz.

Trimming cases for B.S.

Post by Singleshot S.A. » Mon Sep 25, 2017 7:04 pm

Hi all,
in my relentless quest to shoot better groups with a black powder rifle, I find yet another reason for advice.

I am using 40/65 Starline brass which have been checked for length, and they have been used many times.

When I drop tube my weighed Wano PP, some cases don't fill to the top.

Is this just a difference in the way the powder has fallen through the tube, or is it due to case wall thickness.

Does it matter ? Is there any real disadvantage in having some cases full, but others slightly under full. ?

I drop tube then tap the case 5 times, this leaves me with the desired load.

Should I discard those that don't fill. ?

Cheers, S.s.S.A.

bruce moulds
PostsCOLON 85
JoinedCOLON Mon May 04, 2015 11:47 pm

Re: Trimming cases for B.S.

Post by bruce moulds » Mon Oct 02, 2017 1:19 am

one assumes no case sizing is happening.
would it be worth filling preweighed cases with water and reweighing.
if you can get a consistent fill, ie no trapped air and make the tops consistent, the capacities can be compared.
how different are the powder heights?
droptubing is an art to be mastered.
if consistent airgap is the issue, a slight compression of the high charges to equal the low ones might be worth a try.
keep safe,
bruce.

Kodiak
PostsCOLON 142
JoinedCOLON Sun Nov 27, 2005 4:19 pm
LocationCOLON Mid-America

Re: Trimming cases for B.S.

Post by Kodiak » Mon Oct 02, 2017 1:47 pm

Is each powder charge weighed on proper powder scales before dropping thru the drop-tube, into the empty case?

Are all the cases fired in the same rifle?

When were the cases last cleaned well?

Just askin',
Old age ... it ain't for sissies!

Singleshot S.A.
PostsCOLON 81
JoinedCOLON Sun Aug 30, 2015 6:19 pm
LocationCOLON Adelaide. Sth Oz.

Re: Trimming cases for B.S.

Post by Singleshot S.A. » Sun Mar 04, 2018 4:52 pm

Hi guys,
thanks for the replies, I did not ignore them.

My drop tubing has improved to the point that I am happy with the result.
Happy with the way it fills the cases, and happy with the way my once troublesome rifle is now shooting.
I did find that I was not consistent with the speed at which I was pouring the powder down the tube, and that a full or over flowing case cane be re-dropped and the powder will sit differently.
I made up a trickle funnel that I can pour my weighed charge into, and let it trickle down while I do other things.

Yes Bruce, drop tubing is an art, I am finding more things to improve upon on a regular basis.

Kodiak, yes I do weigh every load on good scales. And I do clean my cases very well after each outing. I have two 40/65s, both with their own set of cases as they differ a little.

At the Range I deprime each case as it is used, then drop into a container of soapy water.
When I get home I rinse those in clean water, drop them into a container of Shower Power (citrus tile cleaner) overnight, then run them over a nylon brush in a Pedestal drill, rinse again and blow dry.
They come out very clean inside and out. They might get a Tumble twice a year.

Cheers boys and girls.

Brent
PostsCOLON 1587
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LocationCOLON the most boring real estate west of Illinois

Re: Trimming cases for B.S.

Post by Brent » Sun Mar 04, 2018 5:02 pm

I'm not much of an artist, so I droptube with a motorized tube that gives my far more uniform case filling
Image
I'm not from here, I just live here.

Singleshot S.A.
PostsCOLON 81
JoinedCOLON Sun Aug 30, 2015 6:19 pm
LocationCOLON Adelaide. Sth Oz.

Re: Trimming cases for B.S.

Post by Singleshot S.A. » Sun Mar 04, 2018 5:07 pm

Very nice Brent.

I luv your work.

Brent
PostsCOLON 1587
JoinedCOLON Sun Nov 20, 2005 9:12 pm
LocationCOLON the most boring real estate west of Illinois

Re: Trimming cases for B.S.

Post by Brent » Sun Mar 04, 2018 5:09 pm

I'ts not pretty but it works really well.
I'm not from here, I just live here.

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