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12ga, 10ga, 8ga, 4ga FH; 585HE / 700HE; Other Big Bores

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Here is picture of  thick 375 case sent to me, with thick sided trex  case, and our HE case,

The thick 375 case is .050" bigger OD base, but inside is no bigger than HE cases..

These thick sided 375s stuck for the guy using them, when loaded over 44,000 psi....




Got guys asking and doing it,  to do 416 HSM  case for BMG actions, so  leaving rim same,

as  the original bmg rim, so  will neck them,  fire form to the longer shoulder, like the others.  

Base a little bigger, Shoulder  same diameter,  same 30 degree slant, neck will be same..


Inside of case still has close to same shape, volumne within 3 % as ones we slimmed down more.

Some want to use bmg actions and can't wait for intermediate actions, or already have bmg action.

And they are really getting interested in the complete line of 416 CEB bullets now being done

clear up to 550 gr...


So there will be 3 versions, one for actions  .750" bolt, one for  .800-.850" bolt,  

And one for bigger bmg bolts. The ones for BMG called 416 HSM2 ..


Here is   416 HSM  guy working in a Montana PH, in a heavy thumbhole target stock. Ed




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Here is sectioned 585  HE case in the middle, we first  made from


another case, years ago  before we had factory run of brass and


 it had perfect thickness on the sides and inside corrner.


We could fire them many times without sides thinning..


First case is  factory run of  our 585 HE,  3rd  is case that is too thick


of  sides and sticks at high pressures..




Here is pic of  our factory run cases necked down to 375 and fired 4 times


at high pressure on the right,  with unfired case on the left. Our case is not


perfect but does work...Ed



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About 416 cal bullets............

The heaviest 550 gr for Extreme ELR probably  be best 8 to 1  twist , in 416 caliber bullet,
and 520 gr 9.5 to 1, and 470gr 10 to one, Some barrels I picked up are  10 to 1.......

Now a novel idea is to lighten rear of bullet with small shallow hole drilled in base, might do better
long range.which would allow 10 to one barrel stabilize the heavier 550 gr bullets for ELR.
Making bullet nose heavier makes it more stable in flight, needing less spin,
like our hollow base 585 cal minie bullets only need 48 to 1 twist, or less
while out regular 585 bullets need about 24 to 1 to stabilise them..............

The winner of the King Of 2 Mile shoot last week was using 416 Barrett with a 1 to 10
twist, with a 500 gr CEB Lazer bullet, ...Robert Brantley, with Manners Stocks....

Paul Philips was third with a 416...

GOOD NEWS-- There is now an importer and seller of our 585 HE brass getting set up here,
 in US, hopefully will be in stock, few weeks........   http://bertrambrass.com  .. .. Caleb Hallet..

Have got another  intermediate size action besides the Montana PH our guys working on,
to do speed testingwith. It is  big long REM style action that can take our 416 HSM, ED

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Experimental intermediate size action with  the Montana PH, for comparison.

It is an experimental action for our 416 HSM, to do our speed testing with

and get a better action than Cheytac size actions, for bigger case ELR use,

without going all way up to more expensive, huge actions.

 It is  big long round style action that can take our 416 HSM, almost

 1.6" diameter and .800" bolt, with locking lugs nearly as big as most

BMG actions.... ED


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Here is picture of the bolt from the experimental action,

with our 416 HSM case in it. Note the amount of the

base size of locking lugs, the amount of  area on the bolt..


Here is link to guy doing special 585 HE in the EU, 

Good pictures............www.585he.cz

We tested intermediate action with a 700HE  barrel we had here.

Just temporary to test strength. 1000 gr over 3100..

 Action worked fine.. Ed.

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In 416 HSM  got a 415 gr long target bullet 3800,

with plain barrel, no brake, on intermediate action,

Now my 416 HE gets same 415gr bullet to 3300.Ed

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thanks for the updates and pics! you need a higher res camera, still!! 

what you doing with the too thin brass?  i would like to run em in my ras-12 shotgun if they are gettin scrapped....

Edited by saltydecimator

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so you running 50 bmg primers?  im kinda lost what you doing there.  i could read, but im too impatient(distractable)

Edited by saltydecimator

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None of HSM cases are too thin,


Yes we use BMG primers..in the HSM.



Here is picture of our 416HSM cases with screw in shellholders, 

for Ammomaster, etc, and slip in shellholders for regular presses

Also have some for big LEE Classic and Smart Reloader presses..

A 378 WEA MAG in picture for comparison...

Second is stacks of  416 HSM, about a third fireformed

and the rest  to be fireformed... So far total about 1700, Ed



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Bob Snapp, 90, the great Gun Craftsman, of 

Clare, Michigan, passed away Jan 28th....

He was an esteemed member of the

American Custom Gunmakers Guild,

Being its president in 1992..He liked

working with Martini Cadet singleshot rifles

.Worked with guys testing armor long time ago.

Maybe the 1st to do 20mm necked down to 50cal

We lost a great friend,,,Ed

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