Yes it will track better than shorter ones.The center
of gravity being way forward is a factor also.
Here are more samples of nice 12ga slugs..Here is pic of
ones RG Henson sent. Jacketed 12ga. 715gr hollowpoints,
on the right and in front a jkt 675gr hollowbase.
RG's number 1-770-366-4846. These will be great for
shorter plastic and brass cases as well as long cases.
Other slugs in pic, in the back, left to right
Foster 436gr- Dixie 600gr- 750gr brass- 750gr hollowbase
brass, and a hollowpoint I put a lightweight plastic filler
in the nose for streamlining..Ed

[Linked Image]

Ed Hubel