To start with there is no 2.1253 to 2.1353 inches on a 7 mag brass case
to the shoulder is 2.040 and to the neck shoulder point that is 2.228
and over all is 2.500.
Now you say on re sized brass you get .015 longer is this after fired in your gun?
make it clear what you are doing if you want some help.
here is your case dimensions and load data for 7 rem mag
http://ammoguide.com/cgi-bin/ai.cgi?...sfuft&catid=13
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