Thread: Powder question

Hi all, I was sorting through some old tins of powder and discovered a near full tin of ar2207 that the tin lid was cross threaded on, so probably not sealed properly. The powder smells ok,might be a bit discoloured,a brown tinge on the top layer but under is normal grey. Do you think it is ok to load or stuffed? Could the burning rate be changed? Was going to load it for .222 my old load was 21 grains and 50 grain projectile from memory. Thanks Steve