I have a .22 Mk2 with power plenum and 700 mm barrel and upgraded to the dual port and pin probe. Then noticed that the 21 and 23 gr slugs tends to tip when the magazine advances. When it reach the point where it is next to enter the breech, it is presented at an angle. The pin probe then pushes it into the breach while it is not strait.
One cannot see if the slug straitens out when it enters the breech, but that made me change back to the original tube probe and opened the air-hole up to a similar size as the dual port.
My reasoning is the the tube probe will straiten the slug out as it pushes it all round the edge into the breach. It should theoretically give better results.
Some makes and weights of pellets or even slugs, have hollow bases with variable depth. The pin probe will push these in to the breech at different depths, making it so much more difficult to find the correct settings. I have lugs with a very deep hollow base, and found that the pin probe does not push the skirt all the way past the transfer port. The powerful blast of air coming through the tp will definitely upset the alignment of the projectile and decrease accuracy. The tube probe seat them all to the same depth and pushes the skirt past the tp, presenting the blast of air in the middle of the projectile.
I don't know if my reasoning makes sense?
One cannot see if the slug straitens out when it enters the breech, but that made me change back to the original tube probe and opened the air-hole up to a similar size as the dual port.
My reasoning is the the tube probe will straiten the slug out as it pushes it all round the edge into the breach. It should theoretically give better results.
Some makes and weights of pellets or even slugs, have hollow bases with variable depth. The pin probe will push these in to the breech at different depths, making it so much more difficult to find the correct settings. I have lugs with a very deep hollow base, and found that the pin probe does not push the skirt all the way past the transfer port. The powerful blast of air coming through the tp will definitely upset the alignment of the projectile and decrease accuracy. The tube probe seat them all to the same depth and pushes the skirt past the tp, presenting the blast of air in the middle of the projectile.
I don't know if my reasoning makes sense?
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