12GA FH to 700HE to 4bore- Magnum Results-

[hubel585]

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....

[hubel585]

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. Manson makes reamers I use,,, Ed.

[hubel585]

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....

[hubel585]

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..

[hubel585]

More info on this gun, we did it for testing 416 HSM with a rebated rim,
to check in intermediate size actions, with the longer, stronger, bolt lugs, Ed..

[hubel585]

Here is experimental action for 416 HSM in a heavy
stock....We lengthened port a little, set bolt stop back ,
opened bolt face fit the 416 HSM rebated rim. Ed.

Here is comparison of Montana PH to Pierce action we did
modified to use for rebated rim 416 HSM testing..Ed.

[pistolero]

Here is experimental action for 416 HSM in a heavy
stock....We lengthened port a little, set bolt stop back ,
opened bolt face fit the 416 HSM rebated rim. Ed.

Here is comparison of Montana PH to Pierce action we did
modified to use for rebated rim 416 HSM testing..Ed.

Loving the thread! Great information. Thank You hubel585

What is the Steel, you are using on the action?

[hubel585]

I think they use 4140..Chrome alloy..Ed

[hubel585]

416 & 460 HE AND 416 & 460 HSM .LONG RANGE AND HUNTING
Can be set up in  Pierce  X10  ACTION for the 416 & 460 HE  
AND X20 action for the 416 & 460 HSM , Can get those
if guys need one...Ed

[pran80]

This is enormous amount of information. Still trying to digest it all.
@hubel585 thanks a lot.

[hubel585]

THANKS...

Here is picture of my 416 HSM test gun,... It is a big falling block we had
as a 8 bore years ago. Has a 34 inch , 1 5/8 "diameter, 1 to 10 twist barrel. .. Ed.
http://www.gunownerstv.com/hsmfb.jpg