This was discussed in another thread, apparently Cheddite makes three shotgun primers, CX2000 (pink and blue box), CX1000 (yellow box) and CX50 (I have never seen a box). The 2000 is their hottest primer, the 1000 is their medium strength primer and the CX50 a low power primer. I have never seen the CX50 and I haven't seen any loading data that specified which Cheddite primer was used, 2000 or 1000. I have used 2000 and 1000 in the same loadings with no ill results.
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