Are you talking about the smith and alexander magwell? That's the one I was looking at. Do the guide rods have to be fitted? What weight spring for a .45?
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I only run a 45's in L-10 (single stack), but on that pistol, I run a 13 lb spring using 200's or 185's grain (what ever is cheaper at the time of buy) over clays power loaded to 166 MPF. In limited, I run 40's with 180’s for the greater mag count (+P edge pressures due to using fast burning N320 to cut down on recoil/tighter groups, with a 22lb recoil spring).
Note: Since you only have to make 165 MPF, running the 230's is not ideal. With that much weight, and slower speeds, the bullet is dropping fast. You will find that the lighter, faster the bullet to make major power factor, the flatter the round is going to shoot.
Yes, smith and alexander magwell. You will either need to cut the bottom of the frame, or you do have the option of milling the inside of the well out to allow the bottom of the frame to slip into it. The latter does leave a slight step inside the mag well to frame, but if the plan is to strip the pistol back down to sell at a latter date (drop the old parts onto a new replacement Para), then this works well. On my practice rig's (the Para 16's), I end up selling the pistol off long before they wears out, and have found that I can do so with the frames uncut/ in stock condition.
In regards to the tungsten guide rods, no they are direct replacement for the steel one used in the pistol. But as stated from the start, sounds like you are pushing too much bullet weight, and way over the only needed 165 MPF in the 45. You get the loads down to just above MPF with a lighter bullet, and you will not need more forward weight, nor anything to balance the pistol out.
And yes the 40 “is the shit” for limited class. The 45 needs to be loaded way down, where as the 40 is just right for the new 165 MPF. Truth be known, with the new lower MPF now even more safely reachable with a 9mm, and if the rules weren’t changed to 40 being the min, I would still be running a 9 for a major since you get 23 rounds in a 140mm mag . With the new GAP frames/slides, you wouldn’t need to scallop as much inner steel out of the slide to get the moving mass down.