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<blockquote data-quote="J E Custom" data-source="post: 1217027" data-attributes="member: 2736">The reason I wanted to know is that some old loads listed were( Example ) 52.000 CUPs&nbsp; the same load now may run 65.000 PSI in the new manuals and that seems to be an extreme difference.With changing brass and powder I just wanted a feel for where I was at with the old loads.It used to be that 55,000 CUPs was maximum and sometimes over maximum and with the new cartridges that were rated at 65,000 PSI That had no better performance I though it was in reality, about the same pressure even though the numbers were way apart.I realize that the CUPs were not absolutely perfect, but they were all we had at the time and was an indication of the pressure based on barrel length, powder type and charge, bullet weight, primer type and seating depth.I also received a reply from one of the members that really helps and I will share it with those that are interested.&nbsp; <a href="https://www.shootingsoftware.com/ftp/psicuparticle2.pdf" target="_blank">https://www.shootingsoftware.com/ftp/psicuparticle2.pdf</a> It also needs to be noted that a lot of the older rifles are/were rated using CUPs and they are much lower, 43,000 to 45,000 CUPs and it is important to not over pressure older actions so I was looking for some comparisons. A good example is the 45/70 trap door, all loads for it are below 40,000 psibut in modern rifles it can be loaded from 55,000 to 65,000 psi.Anyway, it is worth learning about and understanding. so thanks for the feed back.J E CUSTOM</blockquote>

[QUOTE="J E Custom, post: 1217027, member: 2736"] The reason I wanted to know is that some old loads listed were( Example ) 52.000 CUPs the same load now may run 65.000 PSI in the new manuals and that seems to be an extreme difference. With changing brass and powder I just wanted a feel for where I was at with the old loads. It used to be that 55,000 CUPs was maximum and sometimes over maximum and with the new cartridges that were rated at 65,000 PSI That had no better performance I though it was in reality, about the same pressure even though the numbers were way apart. I realize that the CUPs were not absolutely perfect, but they were all we had at the time and was an indication of the pressure based on barrel length, powder type and charge, bullet weight, primer type and seating depth. I also received a reply from one of the members that really helps and I will share it with those that are interested. [url]https://www.shootingsoftware.com/ftp/psicuparticle2.pdf[/url] It also needs to be noted that a lot of the older rifles are/were rated using CUPs and they are much lower, 43,000 to 45,000 CUPs and it is important to not over pressure older actions so I was looking for some comparisons. A good example is the 45/70 trap door, all loads for it are below 40,000 psi but in modern rifles it can be loaded from 55,000 to 65,000 psi. Anyway, it is worth learning about and understanding. so thanks for the feed back. J E CUSTOM [/QUOTE]

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