Originally Posted by Jim R
My exact max case length is 2.502 as provided by my gunsmith and confirmed by the Sinclair case length gauge (wonderful piece of equipment). After 4 or 5 firings from my 6.5-06, they are approaching the 2.470-2.480 range. This is a custom gun with all the measurments in hand so I am not real concerned about SAAMI. Thanks, Jim R
OK, you didn't state what cartridge you were shooting or that the gun was custom initially. SAAMI's not so important--never was if you know your particular chamber length.
So, you used a Sinclair 'chamber length gauge' (not a 'case length gauge') to check your actual chamber length (not max case length) against the number your 'smith gave you (2.502), correct? (The correct terminology is (being on the same page) is very important in this particular discussion.)
If you can reply affirmatively to the above statement, my experience with a 300RUM at top loads is that I don't trim until I'm within .015 or so of my max chamber length as found by using the Sinclair Chamber Length Gauge. Just my experience. I'm no expert, but I'd say you've got another firing or two in those cases before trimming. Just keep on eye on them and check how much they are stretching after each firing. You may find that with milder loads, they stop stretching and you may not need to trim for a very long time. But, personnally, I problaby wouldn't let them go past 2.490. JMHO. Good luck and have fun shooting!
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