It's what JOC says he used with 140-grain bullets.
Their choices were limited back then, compared to ours today.
DF
I first started reloading back in the late 1970's. There was a Montgomery Wards store locally that sold some reloading supplies, and I bought a little Lee Loader for my 243. The store had a very limited selection of powder and bullets and the only rifle powder they had that day was IMR3031, which is not really ideal for the 243. I also bought some 75 grain Sierra bullets. The only powder measure I had was the little scoop that came in the loading set, which I found out later measured out extremely mild loads. But, the local groundhogs didn't seem to know that, as it was a very accurate load.
Things have certainly changed.
