.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.