RE: just dropping a round into the chamber and dropping the slide: You're not only slamming the extractor over and past the rim, incrementally wearing your extractor/spring.
You're also directly smacking the back of the case with the extractor and breech face, and therefore the bullet, into the chamber. MORE setback, not less...versus the round being guided up a ramp (i.e., more gently...relative term) into the chamber with the case-rim sliding up, behind the extractor claw and in front of the breech face, as is what happens during the normal cycle-of-ops.
Administering chambered rounds: I've found it simplest, for me, to just make the first round I shoot at practice to be my chambered carry round.
I carry Thing1, but practice with Thing2, so the round that was chambered in Thing1 as I walked onto the range is the first round shot through Thing2. It gets chambered a total of 2 times, then is expended.
Upon reloading Thing1 at the end of range-time, I drop that mag and top it off from small stock of carry ammo that stays in the range bag.
Requires no extra tools, no extra time, practically no thought wasted on bullet setback due to having functionally eliminated it as a concern. Added benefit of being a "I'm done with practice (dry or live), back to The Real World" checklist of sorts, if one is into building procedural control measures for things like this.
Contractor scum, PM Infantry Weapons
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