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.

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 long actions like Ruger and Enfield... 
AND Pierce X20 action for the 416 & 460 HSM , Can get those
if guys need one...Ed

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. http://www.gunownerstv.com/intertarget.jpg Here is comparison of Montana PH to Pierce action we modified to use for rebated ...

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..

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..

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....

Away for a time, sickness.. Above guns built by others with 95% of cost spent elsewhere.. On all guns in my calibers worldwide, figures out, nearly 100% costs elsewhere, I just get little glory, as the saying goes.. Here is print with chamber reamer specs for the 416 HSM chamber..There are 3 base si...

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 ...

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 lo...

I just do cases, load development for start and max.... and cheap guns on Enfields and test guns. That gun was done by the owner... 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...

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...

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..

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...... ht...

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=...

..... 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,.... 2...