My first Contender was a 14" 7-30 Waters identical to yours. I added 222 Rem and 375 JDJ barrels. All shot very well - as good or better than any rifles I owned at the time. I can't help with cast loads - always shot 120 Nos BT's in the 7-30 and 250 Sierras in the 375.
After years without a Contender, I recently got the itch to put one together. I went 14" 7-30 again:
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