Starline makes their 9mm and .38spl +P brass the same as normal with only the headstamp changing.
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Originally Posted by Starline Web Page
38+P
1.140 - 1.150 O.A.L.
38 SPL+P has no difference from the standard 38 SPL, other than headstamp designation for load segregation. This is due to the fact that our standard case design will handle +P pressures with no problems.
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They say their .45acp brass is made with a thicker web at the base.
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45 ACP+P, 45 Automatic+P
0.892 - 0.897 O.A.L.
The 45 Auto+P is a strengthened version of the 45 Auto with the same external dimensions. A thicker web and heavier sidewall at base strengthens the case in potentially unsupported areas. This case has approximately 2 grains less internal water capacity than the standard 45 Auto.
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Starline Order Page
YMMV