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What is normal case growth in a new No4MK2

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Muddly View Drop Down
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    Posted: June 17 2016 at 5:42am
Am using Remington brass with loads of various intensity. With lighter loads, I'm getting growth from firing of .002 to .004 and .005 in my Lee full length die set to neck size only. Mk7 equivalent loads grow .005 to.007 in firing. Same in die. Annealed cases are ridiculous in their growth and inconsistent too. Actual headspace in this rifle is .066 so that isn't it and she has a tight chamber. I had been trimming to 2.20, but found accuracy to be substantially better trimming to 2.215. I decrease the rounds after reloading and thoroughly clean the chamber .. Got some brass loaded x8, but am getting a tad nervous. Is this normal? My first Mk2 didn't do this badly.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: June 17 2016 at 9:17am
It will vary depending on your headspace & individual chamber.
Its also possible you're over resizing & setting the shoulder back.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: June 17 2016 at 9:37am
I've had problems with the last lot of Remington brass that I purchased. It seems the cases are thinner at the neck than the older stuff. I've seen small splits appear longitudinally around the neck area. After maybe only 2 or 3 loads. I did measure it to compare with the older stuff, can't remember the exact measurement; but definitely thinner.
The chamber is a bit big on this rifle, but the head space is good. The chamber generally causes the classic split at the base after around 4 to 5 reloads. Needles to say that they get examined and scrapped when the stress ring appears. 
I am swapping over to PPU cases now.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Muddly Quote  Post ReplyReply Direct Link To This Post Posted: June 19 2016 at 1:42pm
Not bumping the shoulders at all. Have the die set to leave a1/16 unsized portion of the neck above the shoulder. Once my hunting/target loads are finalized, I will be shooting reduced loads to keep in practice. That will be easier on the brass, but given the emerging political climate, every effort must be made to maximize case life...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 303Guy Quote  Post ReplyReply Direct Link To This Post Posted: June 25 2016 at 12:25am
Do you dry the cases after loading?  How smooth/rough is the chamber? 

I don't get any case stretch in any of my Lee Enfields that I actually shoot and haven't had a head separation for 35 years.  I still have some of my original cases.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Muddly Quote  Post ReplyReply Direct Link To This Post Posted: June 25 2016 at 9:50am
I degrease the rounds with a rough towel wet with rubbing alcohol. The chamber gets a tight dry patch x2. I also dry off the bolt face. The last time I shot, I just cleaned the bore, but forgot to dry patch the chamber. Must've got a bit of Hopes in there as my first group was 4 1/2 inches high, the 2nd group 2 inches high and it must've cooked out because the 3rd group was where it should be. Group size was excellent, but showed the wet chamber elevation jump. These were Mk7 equivalent and cases only grew .001. Not a science...
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