My thoughts exactly about the metallurgy part. I think he might have meant the headspace part of it though but not sure and is why I asked. I will keep an eye on my headspace and have replacement barrels planned to put on mine so I will check the lug abutments for set back signs when I take the factory barrels off of them. As for the RPR, I knew the 300 win mag and 338 Lapua were the same size. All they say is that they've up-scaled them from the short action models (308, 6.5cm etc) to accommodate the larger rounds. However, that's the most I've heard, no exact measurements. It's ok though, I'll find out soon enough. I've ordered an RPR in 338 Lapua so I'll measure it myself when I get it.
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