Posted: 5/6/2013 4:14:52 PM EDT
| Just wondering what would be considered excessive set back to the point where you would not want to risk firing it? I used my micrometer from work and checked my carry ammo Vs the same carry ammo that is still in the box never been in a mag. Gold Dot 147gr the unused rounds measured between 28.5-28.6mm and from what I carry the smallest measurement was 28.3mm. To me that doesnt seem like a huge difference but what would be considered unsafe to use |
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Quoted:
No from what I measured it doesn't but the question I have is at what point do you worry That's a hard question to answer with certainty since we don't know what the pressures are. Pressure goes up with setback, but when you start to worry is ill-defined. I can't answer your question but can offer some data published by Ramshot that might help you to come to your own conclusion. 
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I've used calipers on rounds just to see what setback I am getting.
But a micrometer? That is a very tiny amount of setback you are seeing, and honestly I would not continue to use any rounds for defense that have ANY amount of setback. Once you break that seal between bullet and case, the next chambering might drive the bullet far into the case mouth. With a small amount of setback I'd toss them into the range ammo box. Not worth it IMHO. |
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Quoted:
I've used calipers on rounds just to see what setback I am getting. But a micrometer? That is a very tiny amount of setback you are seeing, and honestly I would not continue to use any rounds for defense that have ANY amount of setback. Once you break that seal between bullet and case, the next chambering might drive the bullet far into the case mouth. With a small amount of setback I'd toss them into the range ammo box. Not worth it IMHO. If you have to use a micrometer to check it they are fine. |
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Basically.
I think your worrying too much about what the internet says. I do not have any concern with setback. If the round looks ok it's ok to me. I would only worry if you visually can see the bullet pushed into the case. If you have concerns then rotate your chambered round & only chamber it X number of times before you change it to a new one. |
| personally, I prefer to chamber a round only 3 times, meaning the third time it goes in the chamber I shoot it. I mark the bottom of the round with a sharpie, I then rotate them to the bottom of the mag, so far I haven't had to shoot any of the defensive rounds I rotate. |