Trouble with determining base to OGIVE measurement in 28 nosler. Using Hornady OAL Gauge. PLEASE HELP.

Quick related question. Why do monos like more jump?

My quick thought is solid copper is more resistant to forming than cup & core so the pressure required to get the bullet to form into the rifling is higher than a jacketed bullet. If seated too close to the lands there would be a larger pressure spike when it hits the lands.

If thats the case, I would also think monos run slower than cup & core(assuming equalish shape and same weight & charge) because more energy is consumed forcing the bullet into the bore.

Am I way off?
 
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