Well, the sad truth is that precision is expensive. Furthermore, there is no cheap way to neck turn. It requires more precision and is more difficult to do than a procedure like deburring flash holes. So you can't easily trade your time against the cost of the equipment. In other words, the minimum cost of any neck turning equipment, even the hand held versions, is substantial. In addition, you really don't "need" the procedure unless you have a non-standard chamber.
In addition, the real truth about how much precision you're gonna' gain by neck turning for a standard chamber is going to be near impossible to answer. In theory all the tiny procedures most of us reloaders use in a reloading cycle help a tiny bit and they all add up, but isolating the improvement associated with one procedure is nearly impossible for even the most careful tester. I uniform my primer pockets, but I can't prove it helps even though I believe it does. You get the point.
I would say rather than buy a neck turning device, spend more money on Lapua brass and consider building a "Skip Design" style DIY annealing machine (cost around a hundred bucks). It should give a tiny improvement in precision and if nothing else, your brass will last a long time.
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