Shooting a .270Gibbs? One needs to ask whether all the hassle and extra risk (pushing the pressure envelope and that basic .270WCF case to EXTREMES) is worth "maybe" an additional 200fps over the standard .270 Winchester?
Yet we worship the 280 AI. We are a fickle bunch!
The Gibbs mandates one more trip through a die when setting up the brass initially, but really, is it that much more hassle than an Ackley? In fairness you can of course buy 280AI brass today which makes this somewhat moot.
And no, I don't own a Gibbs. Never saw the point.