Tolerance for a CuNi clad half dollar is +/-7.0 grains(0.454 grams) so it is normal. Looking at the rim is not the best judgement of thickness which can vary with striking pressure. A weak strike will produce a thinner rim while a strong strike will produce a thicker rim.
For example, compare the rims of a proof vs. business strike. The proof rims will look thicker even though the coins weigh the same.
For example, compare the rims of a proof vs. business strike. The proof rims will look thicker even though the coins weigh the same.





















