I've done a bunch of 308 to 7 08 and the only issues was with boolits sized at .285 they were hard to chamber and I had to turn the necks which solved that . Loading with Jacketed wasn't a issue . The necks are a little thicker and are very forgiving while learning the neck turning. I've tried a few 243 to 7 08 and as already started they were perfect . The hard to chamber also depends how tight the neck is in your gun . Mine is a 7 08 Savage Striker with a 7 08 ER Shaw barrel , the factory 7 08 barrel had a little tighter neck than the Shaw barrel does . I rebarreled it to get rid of that Savage on/off brake which I hated and get it to 14 3/4" for IHMSA .

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