Setting headspace for heavy cast bullets?

I know of one so far, let's see if more show up.

Moderator: MudBug

Re: Setting headspace for heavy cast bullets?

Postby GaCop » Wed Apr 29, 2020 4:08 am

Hoot wrote:
GaCop wrote:Searched and searched, no useful data on the internet for heavy cast bullet loading in the Bushmaster, everything is jacketed. I just ordered the 50th Edition of the Lyman manual from Amazon, hope it has some decent cast data.


A snapshot from 9 years ago:

http://450bushmaster.net/viewtopic.php?f=5&t=5252&start=10

Lots more experimentation chronicled here over the years and if it comes from member "pitted bore" you can take it as gospel. Lots more reading using the Google forum search tool site:450bushmaster.net boolits.

Search process detailed in my post in Hoots Information Depository sub-forum here:
http://450bushmaster.net/viewtopic.php?f=15&t=15629

Keep your search term(s) as simple as possible.

BTW, I also work for LEO, albeit for a short while longer. Just about to retire after 23 1/2 years.

Hoot
I did 22 years LE along with 20 years military.
Vietnam Vet Jun 66 - Dec 67
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Re: Setting headspace for heavy cast bullets?

Postby GaCop » Wed Apr 29, 2020 4:19 am

Just go my new 50th Lyman manual. Only cast data in the new book is for a plain base 225 grain RN and a 275 grain gas checked SWC. I did receive some 275 grain SWCs with gas checks from a friend who casts along with some 260 grain plain base pills. Both are poly coated. We also ran some of my .458" 405 grain Missouri Bullets through his bullet sizers to bring it down to .452" but so far I can't find any data for a bullet that heavy. I believe the 1/16" twist of the Rhineland barrel will stabilize it. Learned something about my Rhineland barrel purely by accident. I shot some 230 grain JHPs yesterday loaded over 296 powder. Loads at 29.2 and 29.4 grains grouped 2.4" and 3.1 inches respectively at 75 yards. I decided to see how the rifle would shoot removing the "flash hider". 29.6 grains grouped five into 1.191" with a velocity of 1826 fps and 29.8 grains grouped 1.991" for 1810 fps. Definitely going to ditch the flash hider. I contacted Rhineland to see if they made, or could make a threat protector for the barrel and am awaiting an answer.
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Re: Setting headspace for heavy cast bullets?

Postby Al in Mi » Wed Apr 29, 2020 4:47 am

what kind of flash hider did you have?
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Re: Setting headspace for heavy cast bullets?

Postby GaCop » Thu Apr 30, 2020 4:26 am

Al in Mi wrote:what kind of flash hider did you have?
One made by Rhineland and installed when I bought the barrel from them.
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