What is it that causes flyers?
First off, when you shoot three shot groups and get two touching and one an inch of, you have just shot an moa group. Nothing bad about that and the one that stretched the group may not be a flyer at all, IMO /ubbthreads/images/graemlins/smile.gif
That said, it could be
1. wind
2. flinch
3. warming barrel
4. mirage
5. bedding
6. ammo
7. the shooter /ubbthreads/images/graemlins/wink.gif
And some other things that don't come to mind just now but someone will fill in for me /ubbthreads/images/graemlins/smile.gif
My suggestion is this;
Three shot groups are a lousy indicator of the guns ability. I had a russian m44 that shot 6 moa.
But if i shot enough 3 shot groups it would eventually give up an moa group. It's just the law of probabilities at work or also put, it's Murphy's law, "if it can happen, it will happen" /ubbthreads/images/graemlins/smile.gif
My own standard for testing a firearm or load is a minimum of four five shot groups averaged (no "called flyers" allowed unless you call them without looking at the target)
If a gun is susceptible to barrel heating, I'll usually shoot two shots, let it cool, then shoot three or maybe just two and let it cool and then the last shot. Takes time but it gives a true picture of what the gun/load will do in the field.
I've got a suspicion that if you try four five shot groups as suggested above you will find yourself looking at four rather nice moa +/- groups the average of which will tell you you have a fine rifle.
Follow a similar regimen to test your loads to find the best one.
Heck, as long as I've gone overboard on this post I'll mention another opinion on load testing. It's my belief that the first thing you test for is a good bullet, then a good powder, then a good COAL, then a good primer.
Start with the bullets that will do the job you want to do and load all of them exactly the same with the same powder selection and with COAL per SAMMI spec. You should pick a powder that is generally a good all around powder for your cartridge such as 4350 for your .270. Shoot your groups and select your bullet. Then try some of the other powder selections that are tried and true favorites for your cartridge. Pick your powder and go on to fiddling with COAL and then on to charge weight. Last, play with your primer.
That has worked for me on a number of rifles and there are lot's of other ways to do it but that's my way.
Above all, only change one variable at a time!!