Been working on getting a cast boolit to work with my 357 SIG and found one that shoots pretty decent so far and holds well during recoil which is a problem with 357 SIG on a lot of cast boolits . I am using the 9mm-124-CN sized at .358 w/ PB gascheck. Probably 80% of the boolits will not stay seated at the OAL I have my die set at. They will slowly creep out of the case, sometimes as much as .050". I am using a Lyman M die to expand the cases and have tried the 38P and 38AP expander plug to no avail. I have had to reseat them upwards of 6-7 times before they will stay long enough to get a slight taper crimp on them. After the crimp , obviously, they will stay put.I actually left the dial caliber on a few times while checking OAL and you can watch the dial slowly move up as the boolit creeps out. I have tried not using the gaschecks also which made no difference. It actually looks like air is trapped inside the case and is pushing the boolit out. By the way it is not a compressed load either. Using 6.5 grs of Unique and have tried tapping the cases to get the powder down in the case as far as possible prior to setting the boolit. I do not think this was necessary but tried it just for sh## and giggles which also made no difference. Any possible solutions that anyone can help me with will be appreciated. Thanks
Two words- different powder.You have a compressed charge. You need either to crimp and seat in a single step so the crimp is made while bullet is held in place by a seating stem OR load with far more neck tension so,the bullet is held by the neck while you crimp.
That case has a very short neck. Neck tension isn't gonna be real strong anyway.
Use a less bulky powder. Compressed charges in your case are the issue, changing powders gets away from that. Try a ball powder like AA5.
I might try a smaller expander and different powder also.
I am a sovereign individual, accountable
only to God and my own conscience.?You cannot spend your way to prosperity,
just like you cannot fornicate your way to virginity.?
I belive that for the 357 sig with such a short neck area to hold the bullet and specfiec COL for the bullet you would need a special designed bullet mould , a special mould was designed by a fourm member and one of the fourms custom mould makers made him one . do a search.
Also check the size of your case expander / powder drop tube it should be at least .002 to.004 smaller than bullet dia for normal neck tension and .006 to .007 for heavy neck tension , also you bullets may be soft and swedging down in size after seating & crimping operation , if so try harder bullets or water dropping bullets from the mould may help.
Last edited by bobthenailer; Today at 04:16 AM.
The only fix I can figure is to take your expander plug out and finely sand it down until you get more grip..
This may be a balance act, because if you reduce your expander down too much, your case could squeeze the cast boolit and down size it causing leading, tumbling, Key hole from a small boolit.
Take one thousand at a time, test and do another if all is ok.
Had that happen with 380 rounds, and it was expansion plug not expanding the case fat and deep enough. Case squeezed boolit back up a little, just like you describe.You may not post new threadsYou may not post repliesYou may not post attachmentsYou may not edit your postsForum Rules
Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"
0 comments:
Post a Comment