PERSONALLY I dont worry about it.my poohseventy is so long throated its impracticle to get say a 130grn ballistic tip anywhere near rifling so I simply load to magazine length for all my loads,even with huge big 170grn round nose pills it wont hit rifling but I suspect its pretty close as they shoot really sweat wee groups.
if you set up your dies for one of the projectiles you are going to use the differences in ogive will be cancelled out as die will be pushing projectile from a certain width of projectile (hope that makes sence,the ring you see on soft projectiles from die)so they will/should all be same distance from touching rifling even if some longer than others.
you rifle has short throat so you will have to work with that...set any projectile distance you want then use that dummy round to set dies each time no matter what projectile you loading and you wont be far wrong by my calculations due to the "ring thing" mentioned above.
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