Comparator reloading information

[nedro]

You would be doing the reloading community a tremendous favor if you would please enlighten us with your definition of transfer and standard.
No need to tell us that it is not, "your" definition, that it simply is the definition.
Thanks.

[fguffey]

Do you understand the Hornady/Sinclair tool can not be zeroed because of the way it is designed? Do you understand the Wilson case gage has 4 zeros? Do you understand the Hornady/Sinclair tool can be checked for error with a head space gage? Have you ever considered the head space gage as being a standard?

It is possible to measure the length of the head space gage from the datum to the head of the gage when checking the gage for accuracy. When measuring the length of the 30/06 head space gage the datum used must be 3/8" inch in diameter/AKA known as .375".

The Wilson case gage has a datum, it has a radius ,it is possible to check a head space gage length from the datum to the head of the gage with a Wilson case gage.

Someone made the claim there was nothing about the bullet that could be measured when using the case gage.

Back to the beginning; had you started out to make a transfer you would be finished. The transfer goes from the chamber straight to the seating die. I make transfers because I want to know the distance from the rifling to the bolt face. It is not my job to convince anyone it can be done and the method is cheaper than a stack of tools.

F. Guffey

[JagerDog]

Comparator is of no value until you have a tension gauge that reads in tensions. I've found best accuracy around 5.473 tensions in .25 - .375 caliber.

[nedro]

Thank you Mr. Guffey,
I appreciate that you took the time to explain your thoughts.
I value all the pertinent information I can get.

[smoothy8500]

I appreciate that you took the time to explain your thoughts.

You do realize he hasn't explained anything other than no one else knows how to do it except him?

[divingin]

Measuring length to a specific point on a taper is more difficult because we need to locate that point first (the purpose behind the Hornady attachments) before we can measure a distance to or from that point.

And then there is the problem of where to actually measure to.

Take the base to shoulder measurement: Generally the datum point measured to is specified as halfway along the slope of the shoulder. For a SAAMI ideal 308 case, that's 1.634" at a diameter of 0.400". If you assume that not all new cases are ideally compliant with SAAMI specs, and you assume that there are differences between tools (diameter differences, edge-relief differences), possible differences in shoulder angles, etc., you can see how getting a reliable accurate measurement is difficult (unless you're Guffey.) Add in expansion and growth from firing, and it gets a little more iffy.

Hence the comparator: Get rid of the need for a hard measurement, and simply compare cases. If a case is a tad too long and drags when chambering, use a comparator and make the next case a little shorter than the one that barely fits. No need to know exactly what it is, and you've still solved your problem. It doesn't solve every problem, but gives you simple method to check and verify that one.

[fguffey]

Take the base to shoulder measurement: Generally the datum point measured to is specified as halfway along the slope of the shoulder. For a SAAMI ideal 308 case, that's 1.634" at a diameter of 0.400".

Halfway along the slope? The datum for the 8X57, 30/06, 280 Remington, 270 Winchester etc. etc. all the way down to the 25/06 is 3/8 " or .375"; How can the datum be located halfway between the neck/shoulder juncture and the case body/shoulder juncture?

F. Guffey

[fguffey]

By difficult to obtain what I am referring to are the tools we most commonly use. In that regard, we most commonly measure length from end to end. Measuring length to a specific point on a taper is more difficult because we need to locate that point first (the purpose behind the Hornady attachments) before we can measure a distance to or from that point.

"Measuring length to a specific point on a taper is more difficult because we need to locate that point first"

There has to be something about reloading that is not fair to all; I am provided a datum that automatically locates a point on a taper. My datums are not case friendly.

F. Guffey

[divingin]

Halfway along the slope? The datum for the 8X57, 30/06, 280 Remington, 270 Winchester etc. etc. all the way down to the 25/06 is 3/8 " or .375"; How can the datum be located halfway between the neck/shoulder juncture and the case body/shoulder juncture?

F. Guffey

Halfway along the slope of the shoulder. Yes, halfway from the shoulder neck junction to the shoulder/body junction. We've had this discussion before. A "datum" is simply an agreed upon reference point, despite what you say it is. Perhaps you'd feel better if I changed "generally" to "often"?

Assuming the shoulder angle is correct before and after sizing (which most people do), it doesn't matter where on the shoulder you measure, as long as you compare the cases using the same tool.

[smoothy8500]

[fguffey]

Halfway along the slope of the shoulder. Yes, halfway from the shoulder neck junction to the shoulder/body junction. We've had this discussion before. A "datum" is simply an agreed upon reference point, despite what you say it is.

'despite what I say'? I say the datum is a round hole, I say the datum for the 30/06 case is 3/8"/.375" in diameter. The datum above and or below the .375 datum is larger and or small in diameter than the .375" datum..

I make datums, when measuring the length of a case I can use a datum/round hole that is smaller in diameter than the shoulder/case body juncture and or larger in diameter than the neck/shoulder juncture. With a head space gage I can measure the length of the case from my 'new' datum to the case head; but there is no place to verify the information.

I am the fan of measuring before firing and again after firing; I am so the fan of measuring before sizing and again after sizing.

F. Guffey

[JagerDog]

Halfway along the slope of the shoulder. Yes, halfway from the shoulder neck junction to the shoulder/body junction. We've had this discussion before. A "datum" is simply an agreed upon reference point, despite what you say it is. Perhaps you'd feel better if I changed "generally" to "often"?

Assuming the shoulder angle is correct before and after sizing (which most people do), it doesn't matter where on the shoulder you measure, as long as you compare the cases using the same tool.

Hence a 40 S&W case and a pair of HF calipers.

[AGGRO]

Got the rest of my parts today. Tomorrow going to be a good day, even after a covid shot. Hopefully.