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You will have to play with setting depth…But this is what I normally do for my 223…
I just basically load a dummy round with the desired projectile to max OAL to fit the mag and then chamber it to see if the bolt will cycle…if it does not cycle I back off in .010 increments till the bolts cycles easily…usually its .030 – .050 off the lands depending on the projectile shape. That gives me trouble free field shooting for predator hunting. I'm never touching or jamming the lands with my reloads to avoid a sticky or heavy bolt in the field.
For longer projectiles in the 75-80gr + range I use a modified factory mag that gives me an additional .25″ on the length to achieve optimal setting depth for load development, mostly these are target rounds.
Same process applies. Dummy round into or touching the lands then back off till bolt cycles easily and then test setting depth…usually i'm .030 off the lands for best accuracy.
