In this time of primer scarcity, I decided to get all my primers in one location and make an Xcel spreadsheet to track usage. Well, after reading about the shortage of LR primers on here the other day, I found to my surprise that I have 5,500 LR magnum primers. My only use will be in .308, .30-06, .30-30 and .45-70. I think the reason I bought them years ago was that I was shooting a lot of .45-70 loaded with Pyrodex, I know, boo-hiss, but it was and still is the only game in this area.
My question is, how much, if any will I have to modify my smokeless loads using the LR-M primers? Thanks in advance for all input. GF