head space, no one that knows what is is has trouble finding it.
Perhaps I did not think you knew the difference between a comparator and a head space gage. I found a tool that was not related to reloading, $2.00, 70 years old, someone with me at the gun show asked me why I needed another tool, he said he knew I had at least 3 that were similar, both metric and standard, I said DATUMS.
A collector, smith, resource person, machinist, participant on another forum involved in a thread on datum and head space called me, basically he ask "HOW", I ask him if he was standing in front of the mill, drill press or lathe, he said he had all three, does it make a difference? My reply was that it did not make a difference to me because it can be done on all three, but as for me I make them (datum) up. Jim Tarelton is sharp, it did not take long to explain, I finished, he said "I be Damn", I then told him to go to one of his tool boxes and remove a tool (I did not ask him if he had the tool, he is a machinist, I knew he had the tool), he then said "OK, now what?", I said "think about it" and again he said "I be Damn".
I should not have had to provoke you to speak, never in all the time I have participated on any forum that you have been on do I remember you acknowledging there were other participants, in all these years I have not agreed with you but said nothing, going back to your collet die for magnums, RCBS made dies before the Internet called BAR dies for auto loaders, I have three sets, 300 Win Mag, 30/06 and 270, the M1 Garand chamber is larger than the chamber for the M1917 Enfield or 03, a different reamer was used on the Garand. When Browning made the BAR, the clearance was made into the die. As, I believe it was, Bart B. said he would cut the top and bottom of a magnum die off and call it a a body die before he would pay the kind of money you were asking for the die.
NEW technology? again the tool was 70 years old, because of age and neglect it was not easy to read, I did not design the tool, I found another use for the tool because those kind of things do not lock me up.
Starts with 'hung up' and finishes with "Does this help?" For satisfying a curiosity, your tool is expensive, as has been stated a Wilson case gage can duplicate case comparison measurements, go, no-go, and with a straight edge and the 'companion gage' to the press, the feeler gage, height gage, depth gage and dial caliper, the Wilson case gage can measure and compare case length from the shoulder to the head of the case in thousands. Datum? New technology? The Wilson gage does not use a datum, cases inserted in the gage seat on in the shoulder, if someone can measure case protrusion they can measure the effect the chamber has on the length of the case after it is fired, and if the case was measured before firing the difference in the two measurements indicates the effect head space had on the fired case. With one exception, the Wilson is free standing, stand alone gage, the minimum length on the cage is = full length sized, commercial length, max, length of the gage is less than .005 or shorter than the length of the perfect go-gage length chamber.
Instructions on the use of the Wilson gage may not have included the instructions in the beginning, the instructions are available now but according to Innovative the Wilson case gage only gives ball park figures.
The Wilson measures from the shoulder back to the head of the case and from the shoulder of the case forward to the mouth of the case.
The Wilson case gage determines the effect sizing has on the case, the Wilson case gage determines if the case is not sized enough, or as I said, if head space is know first the measurment can be transfered from the chamber to the press, die and shell holder and back to the chamber, the Wilson case gage is relitive to the chamber, sized case and fired case.
F, Guffey
