nrb: I did check the website, and I agree with you there is no H414 information.
The lack of information does not surprise me. I have been collecting different editions of reloading manual for years. Back in the 1960, and 1970 period data in the different manuals normally used the same powders. As the selection of powders increased loading data for some powders are not published.
I talked to Lyman a few years ago because I had a powder with little published data at the time. The person who helped me advised me that they were working on a new manual, and there would be a process selection process using a pre-set criteria for the powder they would publish data for.
I did go to the Hodgdon, IMR, and Winchester website and did find data for WW760 powder in the 30-30 Winchester. Please note this information copied off the site today shows pressure measure in CUP.
150 GR. SIE FN Winchester 760 .308" 2.550" 35.9 2090 30,000 CUP
170 GR. SIE FP Winchester 760 .308" 2.550" 33.6 1975 30,000 CUP
I do not question that you were told that H414 was not safe. I do question the person who provided the information because it is contrary to long published, pressure tested information. If additional information does not satisfy me the day I get ready to reach for the H414 I will make that phone call. I did go to the links for Hodgdon, IMR and Winchester looking for any warning regarding the use of H414 in the 30-30 Winchester thinking that if there was finding it was dangerous to use that a published warning would be in order. In the past when there has been a safety issue with a lot of powder a warning has been published on the WebPages.
The nice thing about this forum is that we can share information. If information is contrary to data we need to reconfirm the new findings.
While psi is becoming a common format, the cup measurements are still published and manufactures are using both formats. I am including a link to the 2008 Hodgden Manual for you to browse.
nrb: I did check the website, and I agree with you there is no H414 information.
http://www.hodgdon.com/PDF/Hodgdon%20Basic%20Manual.pdf