1. Does anyone else modify the Marlins to handle a 2.7" OAL?
Brockman, Nonneman, Clements and Dave Clay will do the work.
2. would you use a 300 grain on elk?
300 grain Nosler Partition Protected Point at 2100-2350 fps. The 300 grain Speer #2482 will work but I'd be worried about it on shots with difficult angles like a front quartering shot.
