I've heard a minimum of one caliber worth of neck to bullet contact as a good rule of thumb for a repeater. The problem with having less is that the bullets in the magazine may back out of the case under recoil. This is especially an issue with heavy bullets and stout recoil.
180gn is pretty light for .338, no? The reality is that you usually can't load light bullets for caliber close to the lands and keep enough bullet in the case. You will probably have to load shorter.
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