Back when Remington was worth a crap, and you could find them 30 years ago. I shot 100gr cor lokts out of my 270. Loved them. Did great. Don’t know if that helps.
my dad bought some by 110 tsx by accident, so he worked up a load for them, they left one hell of a hole. when he ran out of the 110s, he went back to the 130s. he used 4350 that he stole from me