Reloaders are a bunch of weird people!
Now, I am a reloader, but I don't consider myself weird (maybe a little arrogant, but not weird).
I have seen reloaders get all upset because there is a variation of 0.00005" in their runout, case length or overall cartridge length.
Personally, I have found that all the work required to "true-up" cases or ammo beyond +/- 0.005" is a law of diminishing return and a practice in self-abuse.
I recently had a look at the "factory specifications (as well as SAAMI specifications)" for the .243 Winchester case. Has anyone else looked at them?
If not, here they are...(all measurements are in inches ... sorry to those of you who use that gawd-awful metric system):
Case head diameter - 0.4630 to 0.4730
Case head thickness - 0.0290 to 0.0390
Bevel on case head - 35 degrees to 55 degrees
Extractor groove diameter - 0.3890 to 0.4090
Extractor groove length - 0.0550 to 0.0650
Bevel on case body to extractor groove - 30 degrees to 36 degrees
Case body diameter at bevel/body junction - 0.4623 to 0.4703
Case body diameter at body/shoulder junction - 0.4473 to 0.4553
Length of case from head to shoulder - 1.5598
Diameter of body/shoulder junction - 0.4540
Angle of shoulder - 20 degrees
Length of case from head to datum line - 1.6270 to 1.6340
Diameter of case at datum line - 0.4000
Length of case from head to should/neck junction - 1.8043
Diameter of shoulder/neck junction - 0.2680 to 0.2760
Overall length of case - 2.0250 to 2.0450
Diameter of neck at terminal end - 0.2680 to 0.2760
Overall cartridge length - 2.540 to 2.710
Bullet diameter - 0.2400 to 0.2430
Now, the average schmoo will grab a Remchesteruger Model 7077MKII-1/2 off a mart store rack and also grab a couple of boxes of "the cheapest ammo you have" at the same time.
He will put his $29 scope on his rifle, go to the range, and fire a couple of shots to sight the sucker in.
Then he will fire a 3-shot group at 100-yards, and if it is less than 6" he will consider it "good enough for hunting". However, more often than not, if he is a decent shooter, his group will be around 2".
Then he goes hunting...meanwhile, us reloaders are spending hours, if not years, attempting to find the "perfect load" for our custom-made, pillar-bedded, free-floated, air-gaged rifle with that $1,000 scope on it!
Sure it is satisfying to finally have a firearm that does 10-shot, 300-yard groups of less than 0.25"...but damnit, his deer jerky tastes just as good as mine...