Yep, all pretty much on the money. KG will know better than most about not being able to get projectiles to shoot... A reliable source of "sensible" projectiles should be one of the first things that is considered when developing a load/building a rifle.
This is a major reason that I built a 338 rather than a 375 for LR. The 300gr SMK was readily available and the 300gr Hybrid was coming. There was (still is) all sorts of wild fantasy 375 ultra high bc projectiles being tested through specialised gain twist etc barrels. Building something based around one of these would result in a very expensive safe dweller "coz I'm waiting on projectiles for my ultra specialised barrel as it won't shoot anything readily available (which are all flying bricks designed for close range big game felling)" (in my opinion). Sure, barrel life is better in a 375 (who really cares when you are building something like this?) but the projectiles at $5 a pop would make for a much more expensive beast to run, not to mention that you couldn't afford to shoot it coz either (1) its to expensive, and/or (2) you don't have any projectiles...
It is also the main reason I have a 7mm as my main hunting rifle. Either 162gr amax or 180gr hybrids/vld's make excellent LR projectiles, and there are heaps of choices for closer range things.
In saying all this, both my 7mm and 338 are custom cases, with custom dies, but since Greg Duley had done all the the load development/testing, it cut out basically all the BS of building something a bit different. Not wanting to push Greg's stuff, but I think his light weight LR rigs are a very good combination of parts without going crazy with custom actions etc.
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