Much of Nevada is desert, rainshadows included. Very little annual precipitation. You can expect 100+ growth rings per inch.
The precip is so poor and so irregular that it was possible for the first dendrochronological sequences
to be established in the Arizona/Nevada region. Last I heard, 7,000 yr climate/age record.
I've got some coastal (wet zone) western red cedar which is a measured 75 rings/inch, like bone to carve.
At the same time, I agree that the rifle may have been left against the tree at any time after
its date of manufacture.
The precip is so poor and so irregular that it was possible for the first dendrochronological sequences
to be established in the Arizona/Nevada region. Last I heard, 7,000 yr climate/age record.
I've got some coastal (wet zone) western red cedar which is a measured 75 rings/inch, like bone to carve.
At the same time, I agree that the rifle may have been left against the tree at any time after
its date of manufacture.