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

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

.....


It is possible  rig up holders for many types setups.,

About shellholder supply for big cases,

RCBS and others make slip in holders for shotgun cases

that can work or reworked for big rimmed rifle cases...

Here are various sizes.......

16ga-- .810" rim,........  20ga--  .760" rim,....  

24ga--  .725" rim,.......   28ga  .680" rim....

Ch4d and Buffalo Arms also have these larger shellholders...


We fireform the 416 HSM  with 65 gr of medium speed

surplus powder, with rest of case filled with farina

and grits mix, with a play dough plug in the neck.

It is  loud, so we shoot it into big container through a barrel size

size hole, so the sound is muffled, so it doesn't deafen us..


It is great getting more companies making  416 caliber bullets,

long target and bore rider bullets. Ed..



....

The 16 ga rim diameter and "It is great getting more companies making 416 caliber bullets" get big thumbs up from me!



Paul

My old friend, Bob Snapp gone. :(Bob & I had conversations about the little Martini Cadet actions many times. Great guy and innovative thinker. He designed and made rimless extractors for the Cadet  actions. Last conversation I had with Bob, he told me he was quitting making the extractors. He was a bit older than I & like  P.O. Ackley told me, just don't feel like doing much any more. I know the feeling but still thinking & plucking feathers when the mood hits me. .......RIP Bob.  ......Paul H

Wonder if a PTRD with 5 ft long  barrel is stable enough

for  ELR ,  rebarrel to 416 and use our 416 HSM, 500 gr bullet ....

.Here is up north guy using 585 HE in a PTRD with inserts,

Light load.....Inserts are in the shape of the 14.5mm  case....


https://www.youtube.com/watch?v=jyabm-cbwgc&feature=youtu.be


HERE ia video, 585 Hubel Express and water jugs - slow motion

750 gr with 155gr  RE17,  just a moderate load.....Ed


https://www.youtube.com/watch?v=uXAo1mJqw8Y

20mm Vulcan is a big case that works ok, without having

the sides made too thick...They have  thinner sides

than smaller  cases guys are getting  that have the sides

 made too thick and won't extract easy or work with high pressures.


Here   Barnard P Cheytac bolt that would do for our 416 HSM..Ed......

Got guys doing  various 416 HEs..

One just  built a 416 HE,  just been  testing it a few days..

And using  168gr of HBMG 475 gr CEB,  tested it, in good

conditions, 2 shots at 1800 yards and  was within

a 1/4 of minute accuracy...A few shots at shorter ranges

had same accuracy. Ed..

More about our 416 HSM  from BMG brass,  and
our  416 HE  &  460 HE  from our 585 HE cases
Got reamers for 375 HE, 416 HE  and 416 HSM,....

 460 HE & 460 HSM are all spec'd, got  HE reamer
soon have HSM reamer...Our HSMs have a Wea type
radius on the shoulder..

The fellow that set up our 416 HE in an ELR rifle
and got  1/4 min accuracy,
They got some game out west over 1400 yds..
.Here is the gun they set up.
Using a  K&P 34" barrel on a BAT action.....Ed

And have got  460 HSM specs setup,  the impetus for that is some
 asking about one and new great line of  458 bullets CEB now has.
 
It will hold more powder than the 416 HSM and will get
a 572 gr as fast as 416 HSM gets a 475gr.....Ed..

The guys that did the super accurate 416 HE did another
416 HE that has an 8" longer 42 inch K&P barrel..

Used a Stiller action and same load with 475 gr bullet, as in
first gun and and gained about 200 fps with good accuracy.
3065 fps. Tested 2 groups of 3 and less than 1/2 min moa.
 
And loads they used are not the highest speed loads
the cartridge is capable of....Here is  print with specs for
the 416 HE reamer chamber ....Ed....

More about he guys that did the  accurate 416 HE, they  did a
416 HE that has an 8" longer 42 inch K&P barrel..

Used longer barrel and the same load with 475 gr bullet, as used
in the first gun and and gained about 200 fps with good accuracy,.
3065 fps. Tested 2 groups of 3 and less than 1/2 min moa.
 
And loads they used are not the highest speed loads
the cartridge is capable of....Here is picture.......Ed....

Away for a time, sickness..
Here is print with chamber reamer specs for the
 416 HSM  chamber..There are 3 base sizes we have,
depending on actions used. Got reamers for all 3..
Got cases for all of them..
Our cases are public domain, so that is why I post
info and specs.  To help guys do their own setups.
Manson makes reamers I use,,, Ed.

Here is reamer  print with chamber reamer specs for
the 460 HSM chamber .Couple guys getting set
to do 38-40 inch heavy 458 target barrels...Ed....

With 40 inch barrel 416 HSM ,475 gr, get  3650,  over 13,000 ft lbs muzzle energy.
Got guys getting set to have 38-40 inch 458 barrels made for 460 HSM.Ed..