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With the 70grn and 20" I would be looking for in the 2,900 fps range. But less won't affect the terminal performance much, just the trajectory.

For every single story of a stag absorbing 10lb of big caliber lead and copper there will be 20 stories about a .222 or .223 knocking one over with a single well placed shot. The exception is the...

The 70 grn Speer do stabilise. That is what they were designed for - slow twist barrels. In fact they will stabilise in a 1/14. They will work fine. Note: Just looked back and JD has said this.
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