Reliably expanding 245-255 grain 45 Colt bullet?

[Naphtali]

The only 45 Colt mold I own is a Saeco 300-grain SWC-GC that is intended for hunting. I'm looking for another specialized bullet-load combination oriented toward a more personal defense. What I want to emulate are the "FBI Load" 38 Special 158-grain lead SWC-HP @ 850-900 fps (Remington/Winchester/Federal) and its steroid-enhanced Buffalo Bore load @ 950-1000 fps. In short-barreled 38/357 Magnum revolvers this load has many decades of documented effective performance.

I am hopeful emulation in 45 Colt can be obtained without resorting to a hollow point mold since my goal requires somewhat less expansion than is usual from the 'FBI Load." But if hollow point is required, so be it.
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Having chronographed muzzle velocity between 850 and 900 fps, what lead:tin:antimony or lead:tin mix yields consistent expansion for 245-255 grain SWC or truncated point 45 Colt bullets? The consistent expansion to which I refer would be from initial diameter of .452 inch to at least .600 inch. If this mixture leads severely, that's okay.

Having identified the lead mix, please suggest .452 molds having configuration and meplat likely to do the result I want. As a rule, I prefer fewer lube grooves, but wider and deeper.

[fredj338]

I had Eric @ HPMS convert a RCBS 270saa mold for me. It throws 285gr solids & with two diff pins, I get a 250gr SCWHP that will expand down around 800fps & a 265gr cup point that expands well at 1000fps. As you can see, 25-1 lead/tin alloy. A 20-1 would slow things down a bit.
http://img.photobucket.com/albums/v703/fredj338/452-251.jpg (http://smg.photobucket.com/user/fredj338/media/452-251.jpg.html) http://img.photobucket.com/albums/v703/fredj338/452-268-1K.jpg (http://smg.photobucket.com/user/fredj338/media/452-268-1K.jpg.html)

[Harter66]

I've run 50/50 WW / 1-20 @ 1050 and had more debris damage than expansion. At that speed at 17 yd a through and through on a 165# bore resulted in a shattered rib about 3 " below the spine with a 2nd rib about the elbow broken . The bullet passed through about 15 " of hide ,hair, bones and lungs . The lungs were bloody jelly and the exit hole was about dime sized in the offside "shield" showing bone chip spray. The hide exit was 1/2" . This with a Lee 452-252 SWC . Impact speed was by Strelok app 965 fps .
With a Lyman 454424 at 850 fps at close enough to cal impact over 825 from the same alloy the holes were about the same only the butcher had only meat and skin keeping the head on as the 3rd neck vertibrea was completely gone with tangerine sized displacement after the neck bones.

I suppose with ACP ,S&W, Schofield or Colts by going to 1-20 or 1-16 with a SWC resembling a Keith design that you could get them up to .600 or so . This presumes a revolver with the length to use a bullet of such design as it is unlikely that they would feed in an auto.
The 454423 is intended for the auto loaders . In any case with the low pressures of the old 45s very soft alloys can be used and as such will expand fairly readily.

With what you have why not pour some of pure lead, gas check and try it out?
Look on Titian the sponsor above try a couple of different moulds in a test medium with pure and an alloy or 2 and see what happens .

Send me a note . I need to run some ML balls it wouldn't be a big deal to run a few of each of what I have in 45 moulds .

[Outpost75]

I have Accurate 45-245D hollowpointed by Erik at www.hollowpointmold.com (http://www.hollowpointmold.com), weight is 230 grains in 1:30 tin/lead. 7 grains of Bullseye 950 fps in 4-5/8" barrel.

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[Naphtali]

This is incredible. I hoped for a solution and obtain a bunch.

I have substantial difficulty shooting a double action revolver with its trigger cocking. My first thought was to swap my S&W 640-1 (no lock) 357 Magnum revolver for its exposed hammer version - the Model 60-xx with three-inch barrel. Having no response to this, my next, perhaps better, thought was to return my 5.5-inch barreled Freedom Arms Model 97 in 45 Colt to Freedom to have it rendered as their non-catalogued round butt "carry gun." I confirmed by dry firing through a week's DVD viewing that I have no difficulty using my 4.5-inch 97 one-handed cocking or two-handed. And with your replies, this is the way I'm going.