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I don't have a 270 but I have been loading over 40 years and I have used a fair amount of Varget.
IMO,varget is not the best match for a .270.It's burn rate is a bit fast.You may find pressures will spike pretty quick on you.
Varget is a Hogdon Extreme series powder,and I think it is very good stuff.If you move to the slower burn versions of Hogdon's Extreme series,I would think you would have better luck.
My first choices would be H4350SC and H4831SC.The 4831 is the slower of the two,and I would bias toward it for heavier bullets.
Having said all that,it does not necessarily follow that your group size has any relationship to the Varget.
Your groups may improve with a more appropriate powder,but there are so many other things that can all add just a little,and combined,its a lot.
On an older car,you may have a tired cat converter,bad plug wires,a plugged air filter,and low tire pressue,but it seems since the guy added antifreeze the mileage is down.
Guard screw tension,wood swell/warp,scope loosened,scope deteriorated,parallax,metal fouling,an unstable make do rest setup on the bench,a little flinch....all are possible.
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