So I'm about to try a lighter pill in my Tikka .243 and the pills I'll be using is the Sierra 70gr Blitzkings. I attached my dummy case to the Hornady OAL gauge, slipped in the projectile and pushed the case right into the chamber. After determining the projectile was just touching the lands, I pulled it out to find that my projectile can't be used because the boat-tail end loosely sits in the neck!
To use this pill, I would be seating it a considerable length (I read at least the diameter of the projectile should be in the neck) away from the lands thus a rather big jump.
I can't imagine getting any decent accuracy with this so it got me thinking that perhaps I should try a heavier pill? I don't plan on seating on the lands, I was hoping to set it between .010 and .020 thou off.
The rate of twist is 1:10 so I would imagine 90gr to 100gr should stabilize better and minimalize bullet jump?