Coal again

[Army-medic]

A drilled and tapped fire formed case should give very similar overall length. The discrepancy between the cartridges is huge.

[DedIdick]

I could understand a couple of thou difference but not .4 of an inch??

[blueheckle]

Thats what I was thinking Guys its a bit much, I will measure both the Hornaday and once fired later just the cases to see if they are the same or similar, just checked they are much the same slight difference at the neck but thats it , just wondering if this so called Hornady is a genuine or a fired case drilled and tapped as the mate cant remember where he got it lol but surly that wouldnt matter if the cases where the same size etc the readings should be close driving me nuts will have another go later at measuring COAL and see how that goes lol

[simgre]

I suspect neck tension and actual case size. Hornady and Stoney Point before them, that their modified cases should never be resized. The case body and shoulder of a modified case is sized to SAAMI spec and the neck, a smidgeon greater, so to provide a friction fit that will allow for removal from the chamber and an accurate measurement gained. Your fired case, despite filling your chamber, is “too slack and out of spec” for the job.

The cost of a “factory” modified case is not just the drilling and tapping...

[blueheckle]

I was told a fire formed case would give me a more accurate measurement than a Hornady mod and I have a fire formed case there with quite a bit of neck tension

[simgre]

I can understand how using a fired case would seem to be “better”, but I’m not sure I agree, and with a variation between the two of 0.382”, something is awry. Likewise, you say that you don’t even know if the “genuine” modified case is such...

I think you have too many variables in the equation at the minute in order to provide you with accurate or reliable information.

[blueheckle]

I think you have too many variables in the equation at the minute in order to provide you with accurate or reliable information.[/QUOTE]

yea I would agree with that doing my head in think I will stick with one case and one measurement see how it goes

well tried that and getting an average of 1.877" to the ogive using a comparitor what would be a good starting point for my first reloads thanks