[frostfire]

Originally Posted by longrange1947

Hollis, not trans sonic, your bullet is doing what the Brits call sleeping. It is what I was talking about above, if I have read your explanation correctly. The round is under spun to make it more accurate at your desired range. Brit Palma rounds are famous for this. The round is rotating around the flight path but not on the flight path, sort of a wobble. The bullet will slowly come back on flight path as the bullet slows and it becomes more gyroscopically stabilized. If a bullet was to go trans sonic while in that condition, the round would really take off due to the turbulence at trans sonic.

Is this the reason, 147gr coming out of my slow-twist 1:32 KKM barrel resulted in key holing at 25m?
I almost wanted to leave it like that so that tiny 9mm diameter would make elongated holes to reach those x and 10 lines

Originally Posted by longrange1947

On the pressure point, that was for the lighter skinner barrels to prevent barrel whip. That is one of the reasons the SVD has such problems is simple barrel whip, well that and crap QC. The pressure point you can find right at the end of the fore stock in which the barrel rests on that pedestal. The heavier barrels do not have a barrel whip problem so the barrels are free floated. This gives about 17 pounds of up pressure and stabilizes the barrel so the bullet comes out of the barrel at the same point, or there abouts.
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Is this the reason I found my 10.5" short barrell AK yields better accuracy than the standard 16" pencil barrel one? I mean better/closer pressure point to the action without much length left for any vibration?

Master Rick, always good to see you back in your element