Hi Jev,
Different bullets have different shapes to them with the point where the diameter of the bullet equals the bore diameter in your weapon being called the ogive. This will dictate the maximum seating depth allowed on any particular rifle cartridge. There are tools available from Hornady to measure this very thing and and the differences between similar bullets of the same weight by different manufacturers can be quite different. Seating shorter is not abnormal based on bullet selection and longer can get to be an issue if the length exceeds the magazine length or if there is an insufficient amount of the bullet base left seated in the catrige case neck . Many match shooters have their sweetheart loads set so long as to only allow hand feeding them one at a time . Being able to measure this prior to building your loads can come in very handy when picking a bullet that best compliments the amount of setback needed to fit the magazine, be seated well enough into the case and get the bullet jump to the lands ( rifling ) into a workable range as the freebore and or some throat errosion on well used firearms will be different. Hope this helps and if you need more insight here feel free to PM me.
10 Spot
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