Let me start this by saying... :money:
I've got a SSK 405Win in a Contender. For all the ney sayers, check your case head size in front of the rim. All the 444 Marlin and associated wildcats have larger head diameters and require lower pressures than the 405Win. Hornady loads factory 405Win to 42,000psi MAX. I got this figure from 2 ballisticians at Hornady. The gun is amazingly accurate. Recoils like NOBODY'S business! BUT is safe.
I've owned one of the GNR cartridges. I'd like a longer neck! In calibers the size Gary uses the 405 case his neck lengths aren't enough. If you have a cannelure you often have to seat past that point to get the bullet to grip properly. BIG MINUS! I'd like to see someone develop a cartridge line off the 405Win, with a 1 to 1 1/2 caliber neck length. I think these would be really nice. The 405 case is a good base. Gary has a good idea. I feel he "improved" the cartridge to much though.
Going to the JDJ line. JD did everything right! Enough neck, enough freebore so people don't jam the bullet into the lands, good strong cases which he based his cartridge line on! I own a 257JDJ, 270JDJ, 375JDJ all rifle length. I had a 6.5JDJ and a 358JDJ pistol barrel. BOTH shot lights out, usually .5MOA. Missed 3 deer in one season with the 6.5JDJD! Had to be the barrel... :oops: so I sold it. Don't remember why the 358JDJ was sold... boy I wish I had that one back!!! Just understand, SSK Industries has done a lot of research and knows what is safe in your SSK barrel. You just cannot go wrong if you follow directions. They are as much as you can get SAFELY!!!!