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Derringer-Most, if not all, of the newer Ruger 45 LC's have a smaller cylinder hole mouth (.449-.451). If you shoot the larger diameter .454 lead bullets through one, the lead must go somewhere. Am guessing ya didn't get the short barrel and birdhead grips to shoot heavier loads through? If you are new to reloading, a good manual (or many good manuals) is highly advised.
To see if your Ruger has the smaller dia cylinder mouth, drop different diam bullets into the rear of the cylinder and see if they drop through.
Although the following load hits lower than the 255 gn loads, it has been very accurate and mild shooting in every Ruger 45 lc tried (six so far).
7.5 gns Hp-38 under hard cast 200 gn .452 lrnfp, medium to heavy roll crimp. This gives about 880 fps from 4 5/8 barrel.
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