Wonder if PTRD with 5 ft long barrel is stable enough
for ELR , using our 416 hsm or .........maybe .458 HSM..........
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