MR, no worries, it's all good. I do hope you have good luck with those bullets. I'm sure you'll find they're very nice as long as you keep your BC expectations realistic.
I look at seating to the lands and fitting the magazine as different problems. If you know you'll always be using sharp secant ogive bullets you can have the chamber cut to suit. If the round is physically too long to cycle through the action, there's not much you can do about that. Don't get me wrong, there's nothing wrong with running single shot--many here do. I personally don't like to have
to do that with some of the hunting I do, that's all. Though if there was a fantastic new bullet available and that's the only way I could use it, I just might have to adapt. Maybe keep a mag full of a different load in the rifle in case I need to jump off the horse and whack something at close range but if I have a really long shot pull a round out of my pocket...I could do it, I suppose, but I'd rather not. Some won't mind.
The thing is, I have already had extremely, extremely high BC bullets up to 290 grains loaded to mag length in my 300 RUM. They can work just fine from that standpoint (though my twist wasn't quite good enough to stabilize these). Keeping the nose length reasonable does sort of put a cap on the form factor you'll be able to achieve--not that it's bad, we're talking better than the 300 SMK which I think most of us 30 Cal owners would happily take--but not as good as is possible with a bullet like Noel's.
And that sort of goes back to my point in my first post to this thread. As you approach the ultimate ballistic efficiency, issues of practicality will pop up and one will need to make choices. But for us 30 cal guys we don't have any of those choices at the moment! None of the currently available bullets come close to making full use of the big 30's potential. If Noel makes us a good 30 Cal bullet; if Berger makes us a 240-ish bullet, if Wildcat bullets starts pumping out some big heavies again...then we'll have choices to make and arguments to have!
Noel, as for the ideal 30 cal to test your bullets I think any of the 30/338 Lapua and improved versions, Wolf, Allen Xpress, etc, would be best. Best brass, shorter case length leaving more room for the bullet, etc. But most of us here are stuck with RUMs so that's mostly who would be buying the bullets.
I really didn't mean to hijack this thread into a 30 Cal discussion, guys. Sorry. But I thought the subject was more of a debate in general, not simply limited to 338 Cal (very few here actually use .375/.408 Chey Tac, 50 Cal, etc for hunting) so I thought the smaller calibers should be mentioned. Starting with the next one down....