I got a dumb question. I have a Sako 300WSM that loves the Federal Premium 180 TSX. I also have a bunch of cheaper Winchester 180 grain bullets that do not group nearly as well. 1.5 inch vs. .75 inch. Will shooting the cheaper "teach" my rifle not to be as accurate with the better loads? I plan on shooting 150-200 rds of the cheap and maybe 40 rds of the premium?? Not a handloader yet so I am trying to save a bit of money at the range.

shooting the less accurate ammo will not change any thing. with the cost of factory ammo,you should start to reload so you can bring it well under .75. its cheaper to reload and you will get better accuracy as well as save money.
if you reload you can develop every day cheap shooting loads for practice

1.5 is more than good enough for hunting.. set them -.030 from the lands and it will shoot better

learn to reload,

The only problem you may encounter is that TSX bullets are sensitive to cooper fouling in some rifles...

If you shoot a bunch of "cheap" stuff...be sure to clean bore before shooting the more expensive TSX's...it may also take a few shots with the TSX's to properly "re-foul" your barrel to get back the .75 inch accuracy.

Good luck.

Additionally while people will whine at length about the copper fouling from shooting the barnes bullets the pure copper fouling is MUCh easier to remove than the guilding metal fouling from conventional bullet jackets.

And Barnes is absolutely right, copper fouling is greatly increased if there is ANY guilding metal fouling in the boore when you start shooting pure copper bullets.

so THE most important thing to do is REMOVE all jacket metal fouling when switching from one type of ammo to the other.

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Additionally while people will whine at length about the copper fouling from shooting the barnes bullets the pure copper fouling is MUCh easier to remove than the guilding metal fouling from conventional bullet jackets.

Good point. Thanks!