When loading for jacketed bullets that aren't bonded, you'll need a minimum velocity for the Marlin that will be rather high in the Bisley. As posted, in addition to the issue of a bullet sticking in the bore is the added issue of bullet separation, ie, jacket remaining in the bore with lead core exiting. If you get two holes on your target, you'll need to increase MV.

Lasercast #1 240gr SWC for rifle .44mag;
H2400 16grs to 20grs; H2400 not listed for .44Spcl rifle loads.

240gr SWC for handgun 44mag; H2400;
19.8grs to 22.4grs.

Handgun .44 Special 240gr SWC H2400;
11.4grs to 13.2grs.

The max .44Special load is considerably less than the amount of powder needed for minimum .44Mag loading with H2400.

Bob

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NRA Life Member since '67