sorry to just barge in but since you reload have you thought about ordering sabots and loading some .223 sabot rounds for your martini. Also HL since you can rebarrel to .30-30 then .219 zipper might be right up your alley. Tim they claim 3500fps with the sabot in a .30-30 and 4500fps in an '06.
http://www.ammo-one.com/SABOT.html