help identifying 80 grain 6mm/243 bullets please

[hammering hank]

Hello all, i have 30 of these things id like to load up and shoot but im not sure what they are. They are 6mm/243 80 grain but as to the manufacturer and bullet id im not sure, i would like to use correct load data. Any help is appreciated.
View attachment 11735

 

[New Camper]

It looks like an old Sierra cardboard box... not a guarantee that the contents are of that manufacture. SP made by Sierra is my guess.

 

[Eagleye]

Sierra almost never has put a cannelure in their SP bullets. [let alone 2! lol]

Those strongly resemble an old, old offering from Remington, but it is so long since I had any, the recollection is dim.

I would start with data for an 80 grain common bullet, start low, and work up in ½ grain increments.

Regards, Eagleye.

 

[hammering hank]

Sorry that was misleading the box was from some sierra 75gr. Hp i had, just keeping theses in that old box.

Eagleye, i thought on doing that with one of my old hornady books im just not too sure on it ive always followed book data, if i cant get a good id on these im sure thats what ill do. Thanks

 

[Andy]

I'd still like to know the manufacturer and vintage of those bullets! I had some old bulk bullets with two cannelures as well. They were for the 30-30 and I understand that one cannelure was for lever guns and one for bolt guns. Don't recall the manufacturer, if indeed I ever knew it, all I know is that they shot well.

 

[sunray]

Hi. You load by the bullet weight, not who made 'em. Any 80 grain data will do. I'd be thinking IMR4350, but only because my .243 likes it.