I'm dabbling with down sizing my 20 gauge reloads from 7/8 oz to 3/4 oz to conserve shot and a little powder. I've found wad references of CB 1034-20 and CB 1075-20 that list a small difference in chamber pressure; both loads run in the 7K to mid 8K pressure range. I thought I had read somewhere the 1075 was a replacement for the 1034 and related the change was due to better sealing in the Remington STS case, which I have a lot of. I can't find the article that says that. Am I correct or is this just another nit that doesn't matter.