.44 special brass dimensions and custom expander design....

[kadams]

Hello folks,

If any of you have experience with .44 special brass and custom expanders I am looking for some info, My bullets are 215gr. hollow base wadcutters sized .4315. My NOE expander expands the cases to .4295 When i seat the bullets in the star line .44 special brass the base of the bullet at the hollow base portion is getting sized down to .429. I'm getting best accuracy at the top end of powder charges in a few different loads I'm thinking I may be missing out on some accuracy. I believe the max powder charges are blowing the hollow base back out and the lesser charges are not achieving obturation? To solve this I'm working on designing a custom expander. I'm wondering if any of you may know how deeply i can expand the case without causing a bump in the case Where the case begins to get thicker? I can only measure the brass wall thickness about .360" deep and the brass thickness is uniform to that depth. I need to get another .130-40" in depth to expand the brass deep enough that it doesn't swage down the hollow base of the bullet. So I need to expand the brass .490-500" deep If any of you have done something similar I would like to know your experience and outcome.

Thankyou for any info.

 

[Alk8944]

Just a suggestion. Try loading without sizing the cases, just bell the case mouth. The .4315 bullet may fit the case well enough without sizing. I have done this in the past. he other possibility is what is the diameter of your cylinder throats? Sizing the bullets to match the throats may solve the issue that concerns you.

 

[jem102]

There may be enough on an M die expander mandrel that a machine shop could turn it to the dimensions you want and reform the bell. They may chamber OK but extraction problems may result especially with heavy loads as you are, in a sense, un-sizing the case. If you have a drill press, are handy with a draw file and sandpaper you could probably turn one out yourself that would be good enough to try and then have one machined if it works for your needs. I don't think the expanders are file hard but they may be.

 

[kadams]

Just a suggestion. Try loading without sizing the cases, just bell the case mouth. The .4315 bullet may fit the case well enough without sizing. I have done this in the past. he other possibility is what is the diameter of your cylinder throats? Sizing the bullets to match the throats may solve the issue that concerns you.

I will try some unsized brass, Thanks for suggestion. The bullets are sized to fit through the cvlinder throats with slight finder pressure so im good there.

 

[kadams]

There may be enough on an M die expander mandrel that a machine shop could turn it to the dimensions you want and reform the bell. They may chamber OK but extraction problems may result especially with heavy loads as you are, in a sense, un-sizing the case. If you have a drill press, are handy with a draw file and sandpaper you could probably turn one out yourself that would be good enough to try and then have one machined if it works for your needs. I don't think the expanders are file hard but they may be.

I have a machinist that will cut the expander to my specs. I'm just trying to insure my specs will be functional and not cause other problems.

 

[kadams]

Just a suggestion. Try loading without sizing the cases, just bell the case mouth. The .4315 bullet may fit the case well enough without sizing. I have done this in the past. he other possibility is what is the diameter of your cylinder throats? Sizing the bullets to match the throats may solve the issue that concerns you.

I just tried seating a couple dummy rds. for a test with no primer they seat fine and when pulled have not swaged the bases!!!, the rounds cycle in the revolver with no issues hopefully the crimp will keep them from walking out when firing I am only shooting them about 850FPS, What was your experience after the second firing do they expand larger again under the pressure of firing and need to be resized? after a second firing? Thanks for the tip I will at least get to check on the accuracy of the unswaged bases without buying the custom expander to find out.

 

[Dan W. Cady]

I just tried seating a couple dummy rds. for a test with no primer they seat fine and when pulled have not swaged the bases!!!, the rounds cycle in the revolver with no issues hopefully the crimp will keep them from walking out when firing I am only shooting them about 850FPS, What was your experience after the second firing do they expand larger again under the pressure of firing and need to be resized? after a second firing? Thanks for the tip I will at least get to check on the accuracy of the unswaged bases without buying the custom expander to find out.

Watch the pressure with hollow base bullets. It's possible to blow the skirts off the bullet and and they will be left in the barrel. Barrel obstruction.

 

[kadams]

Watch the pressure with hollow base bullets. It's possible to blow the skirts off the bullet and and they will be left in the barrel. Barrel obstruction.

thanks for info, I have pushed them over 1000fps and not had any problem, they are cast wheel weights not swaged so I don't think ill have a problem.

 

[rockquarry]

I just tried seating a couple dummy rds. for a test with no primer they seat fine and when pulled have not swaged the bases!!!, the rounds cycle in the revolver with no issues hopefully the crimp will keep them from walking out when firing I am only shooting them about 850FPS, What was your experience after the second firing do they expand larger again under the pressure of firing and need to be resized? after a second firing? Thanks for the tip I will at least get to check on the accuracy of the unswaged bases without buying the custom expander to find out.

You might be able to go several loadings without a full-length resizing, but that's based on my experience with bottleneck rifle cartridges that require a full-length sizing after about five loadings.

 

[kadams]

You might be able to go several loadings without a full-length resizing, but that's based on my experience with bottleneck rifle cartridges that require a full-length sizing after about five loadings.

thanks Im going to give it a go