That is always a possibility when adding a brake, can, or even a magneto speed strapped to your barrel. I had planned on adding a brake to my .260 so I could spot my own bullet splash... Couldn't make myself do it after getting my CBI broke in... I was getting 1/2 MOA for the first 300 rounds which was beyond what I thought I'd be able to do.... It's now down to 1/4 MOA roughly and I'm not going to take the chance of messing that up.
I understand your necessity for it though... you may need to revisit your load development a little bit to fine tune for your barrel now... But you should be in the right ballpark to start with this time....
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