OCW question after switching out my AR Upper Receiver

[waveslayer]

I just did an initial OCW load development for my 6.5 Grendel. Found some awesome loads. But my upper had had a crack in it so I had to switch it out.

My question is, will I have to start my OCW test all over again? The barrel nut tension is a bit less then the previous upper receiver. The new upper receiver has a tighter fit for the barrel as well.. any help is appreciated.

I'm leaning towards doing an OCW all over again.

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[ShtrRdy]

I would probably try the load what worked in the past, with a plus/minus increment to see if the results are close to what you were getting before.