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I imagine it depends on how good the crimp is, as the slide velocity is going to be pretty high.  It sounds about the same as 45 Super.

How did those petals not lay back against the base of the bullet?

No idea.  It's not my article.

it should work fine...

but since learning how some of the writers for that site "test" firearms and accessories, i would always get a second opinion that does not come from an on-line only gun peddler...

I don't know about the article, but some of the comments blew my mind.  There's a long piece of marketing fluff that refers to ".050 micron tolerance".  There's a simple answer to that: baloney.  A few computer chip makers work at that level, and a few of the best metrology labs (my father worked at that level, some of the time).  Firearms makers?  Not a chance.

7,500 years is a long time to work on interior ballistics...

Bob Cohee said:

I can't believe I missed this thread. I've been following the development of the 45 Super since the 90's The 450 SMC is dimensionally and ballistically equivalent to the 45 Super your Boberg is already rated for. The only difference between the two is that the 45 Super uses the large pistol primer and the 450 SMC uses the small pistol primer which might actually be a technically better design because it allows for thicker brass in the head area. If you go to the "Ballistics by the inch" website, one of the guys there who is also a member here has tested both the 45 Super and 450 SMC in a Boberg.

One additional data point on this subject for those interested. I tried Underwood Xtreme Defense 45 Super. I'm sure it is fine ammo, but I had a case separation on the first shot so I do not think the crimp is sufficient for our Bobergs. I have a reloading press on the way and one thing I plan to do is re-crimp this ammo and see how that works. Has anybody tried this yet? In any case, even without the extra crimp, this ammo is fine for the first round fired, so I carry one round of this in the chamber and a mag full of HST +P which is sufficiently crimped.

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