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Your 34 gr powder charge (4064) is spot on. But~ since its a Compressed Powder Charge (and the only IMR load listed for IMR 4064 use w/170 gr. bullets)
Here's what I would do or suggest to another shooter.
1. Cut the powder measure back a little say {1 or 2 grain reduction} for a start point.
2. Shoot 2 shots to group.
3. Check the target every two shots. (Seeing a crummy grouping) increase the powder charge a 1/2 grain for the next 2 shots.
{Can require a further reduction: if the grouping worsens.}
4. (like what you see.) Fine tune that Charging in both direction {up & down} by 2/10th at a time.
5. No doubt you'll soon discover the rifles targeting sweet spot. i.e. tightest grouping.
6.Then it just a simple adjustment of the rear sight (up or down ~ or moving the rear sight to the direction you want the bullet to follow. Left or Right.
Otherwise. Wanting to shoot 165 gr High BHN cast lead. Not a big deal. Just follow the (above) directions as told. Keep in mind your 4064 powder is a Max loading. Better than 2100 fps achieved. Reducing that Powder Charge a little >won't hurt too.
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