Help on loading 30/338 Lapua 35degree Improved

Talked to J E. He told me you have a 30 lapua improved.
Heres my horror story.

Finally got my masterpeice in. Beautifull. mcmillian stock, matt stainless finish, bat action. topped it with nxs 5.5-22. formed a few peices of brass while breaking in. went to range, consistantly shot a 1.375" group at 500 yards. met all my expectations. Then i let someone talk me into using playdough to form brass, i said sure, it will save barrel life. now my rifle wont shoot under 1 moa.
your opinion?
expensive schooling?
 
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