There's nothing particularily special about the Win Mod-70 in .270.
It's a good rifle. Made in several variants over the years.
Is it ??
1. original pre-64 Mod-70 FW
2. push-feed
3. Classic, new production.
All are good rifles.
My favorite .270 loads use either IMR4350, H4350, IMR4831, H4831, RL22, or MagPro.
My favorite bullets are Sierra 130gr, 140gr GameKings. I've also used Speer, Nosler, and Hornady. Not to mention Remington CorLokts, and Winchester back when they were bulk packed and inexpensive. Sierra, Speer, and Hornady bullets are cheaper and better, now.(who would have ever thought ???).
Exact loads will be determined by your individual rifle.
But, I've never seen a 130gr Sierra ProHunter or GameKing over 54.0gr of IMR4350 shoot poorly.... just better in some guns than others.
This is where I'd start.
I loaded some .270's for a co-worker back in 1988. I used both H4831 (58.0gr) and Win760 (54.0gr). He couldn't tell the difference. However, he still loads for that rifle and uses H4831. It's sub-moa for 3 shots. Seated to 3.275"oal if my memory serves me correct. (Sierra 130gr PH and GK's).