Drawing from my old days of shooting field archery I'll give you some information. I'm going back into the 1970's when bows were shooting an average of about 200 fps and good setups reached about 220 fps. I had a Jennings ArrowStar that shot 232 fps. The point being, that we shot out to 80 yards for field shooting with no problems whatsoever.
Even today, Olympic style shooters can reach 90 meters with recurve bows that might hit 200 fps.
So I'm going to take an educated guess here and say the reason your bow won't reach that 70 meters is because you are anchoring too high. If using a peep try raising the peep a little in the string. Maybe a 1/4" or so. This in turn will lower your anchor and your arrows will hit higher. You just have to adjust your sight marks accordingly, but 70 meters is easily attainable if you have things set up to do so. It has very little to do with the speed of the bow.
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