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Group sizes with & w/o a tuner

556 6
Hopefully, I'll be buying a Hoehn tuner for my 10/22 next week. I've read about all kinds of tuners here and on Benchrest Central, and I was just curious about individual experience with them. I know that group sizes will shrink, but has anyone every done group size comparisons on their rifle with and without a tuner? If anyone has(regardless of rifle type) and would like to post their results, I'd be interested.