The Lyman 452423 (Keith semi-wadcutter) at 235-245 grains, depending upon alloy, is superb in any 25 or 625 using either ACP or Auto Rim cases. You can get an honest 925-950 fps with Longshot. You'll have to find used because it's been out of print quite a while.

Keith designed it for 1917 revolvers.

The story of Elmer Keith and his SWC’s. To review -- it’s 1929, The Great War ended a decade ago, the '20s have been roaring for some time, flappers, big bands and jazz have taken the country by storm, the stock market is about to crash, prohibition is in effect and organized crime has moved in to supply the thirsty US of A with libations. The transition has been made from black powder, and the shooting public now has some understanding (and trust) for the new smokeless powders. But magnum handgun cartridges (and magnum pressure levels) are still unknown to the American handgunner. This is the Golden Age of the .45 ACP -- from the newly refined Colt 1911-A1 and the S&W 1917 revolver, to the Thompson sub-machine gun, the .45 ACP was definitely basking in the center stage spotlight. Military surplus ammo and components were widely available, as were revolvers, semi-autos and fully automatic firearms with which to fire it. The importance of this market was not lost on Elmer Keith. He was so pleased with how well his 429421 had worked out in the .44 Special that he applied those same design concepts to the .45 ACP.

Elmer Keith designed the Ideal 452423 for the .45 Auto and it’s thick-headed younger brother the .45 Auto Rim. The result was the Lyman/Ideal 452423, a 238 grain Keith SWC that started off with 3 equal width driving bands, a “square-cut” grease groove, a beveled crimp groove (for use in the revolvers), a short nose (to keep OAL length down so that loaded rounds worked in the magazine guns), and a big, fat meplat (.340”, or 75% of bullet diameter) to maximize their effectiveness in the hunting fields.

The excellent performance of the 452423 in the .45 ACP was, in large part, overshadowed by the subsequent release of the .357 Magnum with its unprecedented velocities and kinetic energy figures, but that doesn’t change the fact that Keith’s first SWC in .45 caliber was, and is, both deadly and accurate. Standard loads for this bullet worked in the 800-900 fps range, and Keith worked up some +P loads that delivered 1100 fps from large frame revolvers. These old guns are best limited today to loads generating 900 fps or less (newer guns, with better steels and heat treatment, work just fine with Keith’s +P loads). Chapter 12 - The Keith Semiwadcutter (SWC) Cast Bullet Guide for Handgunners - Glen E. Fryxell