Rig Magician,
If you are shooting lead 9mm, 124/5 gr will cycle the G17 slide at 4.0-4.3 gr. From
Hodgdon's website:
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125 gr Lead CN HP-38 Dia .356" OAL 1.125" Start 3.9 gr (1009 fps) 25,700 CUP - Max 4.4 gr (1086 fps) 31,200 CUP
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For lead 45ACP, I found that IDP #4 200 gr RNFP shoots more accurately seated down to 1.195" OAL than longer OAL at 1.25" using 5.0 gr of W231/HP38.
With the shorter OAL, accuracy was comparable to that of IDP #1 200 gr SWC loads with the same charge of powder.
Have you tried shooting SWC out of your XDm? XDm has modified slide rib and will reliably extract/feed SWC bullets.
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200 gr CAST LSWC HP-38 Dia .451" OAL 1.225" Start 4.4 gr (771 fps) 11,000 CUP - Max 5.6 gr (914 fps) 16,900 CUP
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