12ga,8ga,4ga FH; 585HE/700HE; Big Bores--

[bogey1]

My custom 50cal BMG I had to use a rubber hammer to open the bolt.
They said it was normal.

[hubel458]

What weight bullets.. What speed .Do you reload or is it factory loads,

there are slower powders that you can pack case full and

still extract ok..And get the speed . Ed

[bogey1]

What weight bullets.. What speed .Do you reload or is it factory loads,

there are slower powders that you can pack case full and

still extract ok..And get the speed . Ed

I was using 222gns of I cant remember (pull down military stuff from pats relaoding ) and 650gn bullet.

[hubel458]

If it was what he sold as being for 50 bmg use it was probably WC-860,

but there are 15 powders slower than that mostly surplus, There is a huge dealer

on Gunbroker that has hundreds of tons of stuff. Called Shady Grady,

there is ball powders, WC 870- 872- 876- 880-- and many more WCs,up to 895

there is stick powders - V V 20n29, and so on .

Get some WC 880 and pack the case full, work fine.If slow then go WC 876

and so on. These are only 12 bucks a lb and you should have

all 4 880-876- 872- 870-, that way you start with slowest and work to the right one

For my smaller bore 375-416s and heavier bullets example we start with WC 890

or 895 and work down to the right one.Ed

[bogey1]

If it was what he sold as being for 50 bmg use it was probably WC-860,

but there are 15 powders slower than that mostly surplus, There is a huge dealer

on Gunbroker that has hundreds of tons of stuff. Called Shady Grady,

there is ball powders, WC 870- 872- 876- 880-- and many more WCs,up to 895

there is stick powders - V V 20n29, and so on .

Get some WC 880 and pack the case full, work fine.If slow then go WC 876

and so on. These are only 12 bucks a lb and you should have

all 4 880-876- 872- 870-, that way you start with slowest and work to the right one

For my smaller bore 375-416s and heavier bullets example we start with WC 890

or 895 and work down to the right one.Ed

Thanks for the info, but I dont have the custom rifle anymore, just the m3hb
and it runs fine with that load. I was using vihatavouri also and the same thing happened.
The guy (klaus horstcamp, state arms) said it was normal, I didnt think so but he knows more than me

I'll remember that name shady grady and check it out. Thanks.


Just checked, its IMR 5010 But I have used the 860 with same results (in custom gun)

[hubel458]

Yes there are V V powders that are too fast but the surplus 20n29 should do,

as it is slower than canister 20n29..

Your M3HB has sloppy Military spec chamber so more clearances, the 5010,

like 860, could be too fast in tight spec chamber..depending on bullet.

Some in the gun world , are a bit goofy, about internal ballistics,

I've studied internal ballistics since the 50s, the fudge factors used in

simple, modern pressure calculations, in place of complicated math military

formulas, were from our experimenting back then.Ed

[hubel458]

Here is recap simple setup to get faster loads with 12ga sabots

& slugs, Example using break actions...., reaming chamber

in a 12ga break action to 3.5" with a 3.5" 12ga reamer, that isn't

something needing special order, and use 3.5" plastic cases , or

get 3.5" brass cases made. With mag shotgun primers and

our slower powder loads you can get a quarter more speed,

which gives 50% more energy...


585 Hubel Express video, 190ft/lbs recoil, heavy load, gun little light.....

https://www.youtube.com/watch?v=tyS9zZ8ElJA


Another view of Asteroid Precision's.... 375 HE target gun,




Here is our 416 HSM we are developing next to 416 Barrett, Ed

[hubel458]

Here in picture of the cases, are shown the steps in making

our 416 HSM case, from BMG brass,, Ed




We might have a company that is doing a bolt gun with an action

between BMG size and longer rifle actions used for 375 HE,

375 Lethal, and Cheytacs.. To use for our 416 HSM without

having to do extreme rebating of the rim.


Here is picture of 620 416 hsm cases half done. Done on cnc ,

that slimmed them down, cut new rim and extractor groove.

There are over 500 more at cnc getting done now, plus we have

1000s more bmg cases we make them from, when needed..

This case is public domain and if anyone wants to make

them we can give the steps involved...Ed.

[hubel458]

For big long cases our testing is showing that the 416 easier to get powders to work with, less problems ..
Maybe building a target gun,don't have 375 barrel all ready, maybe go 416....

We got cases, 416 HE and 416 HSM, as well as 375...
CEB and others will have bullets...CEB will be doing .416 in 450gr, 475gr, 500gr, 525gr and 550gr

Got sent 5 thick sided sample cases, same OD base as 585/375.416 cases, same belt, just .180" longer,
did a 416 HE, chambered extra barrel , cases stick over 50k. They have about .042" total taper, .021" per
side, when I necked couple to 416. That is a lot of taper , twice the taper of my 416HE...hanging up at 50k..

I could maybe go to 65k with these if we made taper with ..012" - .016" more taper to each side, but that is
no way to build target cases. I'd have to crunch down case shoulder diameter. And would look like 30-30.

And crazy part is, the case has enough brass material to thin up sides and stretch them way out to 4 or
more inches,, They weigh 150 gr more than our 585/375/416,, but with real thick sides they actually
hold less than our 416 HE with thin sides, that is .180" shorter...Our case does 65k ok without sticking..

And we can make super long 4" cases work if we had means to get them built, as we have
15 powders slower than HBMG.Here is pic of thin and thick sided cases, sectioned for comparison.Ed..