RSIA,
Welcome to the forum, and do not be surprised if this thread get "interesting". I recently purchased a 625 with the intent of running 45 Supers. I have about 11 years or so experience with 460 Rowlands in the 1911, and a few with Super in the 1911. The 625 is new to me.
There is no question that the 625 revolver will take more pressure than 45acp standard reloadings. The question that arises is exactly how much. I think the issue as to why not more info on these cartridges is that they are mostly handloading only propositions. You can buy 45 Super and Rowland from a couple of places, but the rounds have not been standardized by SAAMI, and as such this raises a lot of conjecture and confusion on the web.
The actual pressure data that is out there is pretty thin. As a result, you will find much of the web discussion degrades rather rapidly, as once you mention the 45 acp, or hunting or increased performance the threads tend to derail. Toss in bear defense, and invariably grizzlies always enter, and goodbye rational discussion.
As to the winmag, you will probably have to talk to some of the custom smith's who do these conversions. The question arises as what is safe, and what may beat the gun to an early demise. It is not simply a case of looking at the pressure level at the top end that the cylinder can contain and assuming the rest of the gun can handle the pressure for a reasonable amount of time. There is also the question of the actual total pressure curve as will be a result of the powder used. Slower powders tend to be easier on the gun, but slower powders can give you fits with some case lengths and bullet sizes. And slower powders prefer longer barrels. I am not familiar with the winmag, but if you need something like H110 to get top performance, it might be a lousy fit for a shorter barrel. It could be the winmag might be safe in the 625, but is not done for performance reasons?
Craig
