07-22-2018, 09:17 AM
(This post was last modified: 07-22-2018, 09:21 AM by Mad Charlie.)
http://www.redding-reloading.com/online-...comparator
I don't know if you know about these or not, and I see that our Grendel's aren't listed, but maybe a call to Redding will help. There could be a possibility that one of the other 6.5's may "cross over", or they will make whatever it needs to work with the Grendel. I do not have one of these, and have never used one, but the principle looks sound.
When it comes to absolute measurement, I will take a GOOD travel indicator over any set of calipers any day. Calipers are not considered to be precision measuring instruments in the world of machining, being generally used for low tolerance "quick and dirty" measuring, but for most handloading purposes are considered adequate. The experience I have gained from over 40 years of production and job shop machining makes me dislike digital calipers. I much prefer dial calipers'
or if my eyes could still see, plain old vernier calipers.
Like others in this thread, I have had the issue of "short brass in long chambers". When I built my Satern barreled rifle I measured factory Lapua cases at 1.205 with
the Hornady tool and fired cases at 1.220. I thought "holy crap, this can't be right". I thought I got a bad bbl. or mixed up bolt. I have since learned that 1.220 is supposed to be min. spec. and the chamber is OK. Then there is my AA chamber, fired cases come out 1.214. So I have been keeping fired brass segregated and sizing accordingly. I checked every case fired in the Satern chamber with a feeler wire for a while without finding any incipient separation issues, so now I just bump the shoulders back .003-.005 and call it good. I will be calling Pacific or Forster, since my dies are Forster, about a headspace guage to use for a standard to set up the Hornady tool, as I feel that the shorter the travel from zero with calipers, the better the accuracy, comparatively speaking. Another thing I do when measuring is turn the case 90 degrees and measure twice, sometimes case heads don't come out square and extractor burrs get in the way, if the measurement stays within .001 I call it good. I also like to de-prime with a de-priming tool before measuring fired cases.
Yeah,,I can see why you want to be extra careful with your handloading!
I don't know if you know about these or not, and I see that our Grendel's aren't listed, but maybe a call to Redding will help. There could be a possibility that one of the other 6.5's may "cross over", or they will make whatever it needs to work with the Grendel. I do not have one of these, and have never used one, but the principle looks sound.
When it comes to absolute measurement, I will take a GOOD travel indicator over any set of calipers any day. Calipers are not considered to be precision measuring instruments in the world of machining, being generally used for low tolerance "quick and dirty" measuring, but for most handloading purposes are considered adequate. The experience I have gained from over 40 years of production and job shop machining makes me dislike digital calipers. I much prefer dial calipers'
or if my eyes could still see, plain old vernier calipers.
Like others in this thread, I have had the issue of "short brass in long chambers". When I built my Satern barreled rifle I measured factory Lapua cases at 1.205 with
the Hornady tool and fired cases at 1.220. I thought "holy crap, this can't be right". I thought I got a bad bbl. or mixed up bolt. I have since learned that 1.220 is supposed to be min. spec. and the chamber is OK. Then there is my AA chamber, fired cases come out 1.214. So I have been keeping fired brass segregated and sizing accordingly. I checked every case fired in the Satern chamber with a feeler wire for a while without finding any incipient separation issues, so now I just bump the shoulders back .003-.005 and call it good. I will be calling Pacific or Forster, since my dies are Forster, about a headspace guage to use for a standard to set up the Hornady tool, as I feel that the shorter the travel from zero with calipers, the better the accuracy, comparatively speaking. Another thing I do when measuring is turn the case 90 degrees and measure twice, sometimes case heads don't come out square and extractor burrs get in the way, if the measurement stays within .001 I call it good. I also like to de-prime with a de-priming tool before measuring fired cases.
Yeah,,I can see why you want to be extra careful with your handloading!