I’ve heard both of these are larger than Winchester 209s. However, anyone have any problems using Cheddites in hulls previously loaded with Nobel Sport 688s?
Cheddite CX2000 primers are only .001 larger in diameter than Winchester 209's, While Nobel and Fiochhi primers are ..005 - .006 inch larger than the Win 209. You can go back and forth between Wincheter and Cheddite's, but either of them will fall out of a hull previously primed with Nobel or Fiochhi..I’ve heard both of these are larger than Winchester 209s. However, anyone have any problems using Cheddites in hulls previously loaded with Nobel Sport 688s?
Chart was accurate when first posted but that was 20 years ago. Manufacturing changes have occurred that make it inaccurate today. Most overseas manufacturers acquiesced to American demands and sized closer to our 209 standard. Not all, but some.Here are the primer dimensions.
Absolutely agree. Use a micrometer and learn how to measure with it.A micrometer is your friend
I’ve got Starrett tools in their wooden precision fit cases in the cabinet area. But I haven’t needed or used them for coming on 25 years now. A “cheap” Chinese made digital caliper and a short section of drill rod as a “standard” is all I’ve really needed lately. It’s just too easy going from a 4 digit past the decimal precision to a decimal is good enough sloppy fit in hacking out something that works. Most of the time.Absolutely agree. Use a micrometer and learn how to measure with it.
I've seen a lot of folks (on this site and others) talking about and showing measurements made with low quality Chinese dial calipers and calling them micrometers. They ain't the same thing, folks. The number produced by these measurements is just that, a number. Absolute accuracy isn't guaranteed. Are they pretty good? Perhaps. Exactly how good or bad? That all depends.
If you want to compare diameters of one primer on your bench with that of another, you can do it with almost any instrument and get an idea of the deltas - but I'd still go with a real micrometer, and preferably one that's capable of 4 digits of precision (a tenth of a thousandth). If you want to produce a chart of real measurements you need calibration standards to validate and provide offsets to the measurements provided by your instruments. If you don't, it's just a table of arbitrary numbers.
"Measured with a micrometer, marked with chalk, and cut with an ax."Horses for courses. When you need accuracy, you need it. When the need is to do something without that degree of precision, 'good enough' is just that. As my dad used to say about fabricating things on a destroyer in WW-II, "Pound to shape, file to fit, paint to match". Getting it done is what counts.
BTW the old Starrett mill factory in Athol, MA isn't far from here. Been on a tour there a time or two when they were still making dial indicators there. My collection of Starrett tools are mostly acquired from the flea markets where the old machinist's beloved tools ended up when they shuffled off this mortal coil. Quality stuff that will last longer than I.