Re: If not Sierra then what?
Unless you're shooting beyond 500yd, it makes little sense to be hitching your horse to the 175 anything.
At 100yd, it's probably hard to find bullet that won't handload and shoot well enough for practice, etc. Any of the major bullet makers 150/155/168 bullets or thereabouts will do fine, it's only when you add the challenges of extended distances and demanding precision accuracy that bullet choices become more critical.
As a beginning handloader, finding the ultimate load is not your challenge; it's getting your loads to be safe and consistent. Until that happens, the rest may be a lot harder to attain than you really need to be doing.
Crawl before you walk, walk before you run, run before you soar...
Greg