2
Info so you can decide
here is a pic of 5R
![]()
Here is a pic of true polygonal
![]()
question lies if the "polygonal" rifling is a true polygonal (check with the manufacture to see if it is a true poly rifling)--- I have seen some debate on weather certain companies make a "true polygonal" rifling even though they are advertised that way
a true polygonal has no sharp edges--- the "R" style has sloped edges
the "3" lands and grooves distort the bullet less than any other style rifling, seal chamber gasses better, and have less engraving force and "internal friction" on the bullet so they often produce slightly higher muzzle velocities and slightly less chamber pressures
some people say that the polygonal rifling can be slightly less accurate but I'm not sure that has been proven--- as far as I know the only 2 companies that sell barrels with the poly rifling are BHW and Lothar Walther, both of which seem to have a history of being accurate barrels --- the new Triad barrel from ARP has shown to be very accurate and have all of the characteristics I listed above for 3 land/groove barrels--- In my opinion, the Melonite coating adds to the list of benefits for the ARP barrel as it tends to show less pressure, and more velocity than non melonite barrels --- ARP are usually less in price that the BHW and LW barrels also
You should also research the land to grove ratio if you want to know all the in's and out's of the rifling-- as some of the manufactures use deeper grove or a wider land than others
here is a pic of 5R
Here is a pic of true polygonal
question lies if the "polygonal" rifling is a true polygonal (check with the manufacture to see if it is a true poly rifling)--- I have seen some debate on weather certain companies make a "true polygonal" rifling even though they are advertised that way
a true polygonal has no sharp edges--- the "R" style has sloped edges
the "3" lands and grooves distort the bullet less than any other style rifling, seal chamber gasses better, and have less engraving force and "internal friction" on the bullet so they often produce slightly higher muzzle velocities and slightly less chamber pressures
some people say that the polygonal rifling can be slightly less accurate but I'm not sure that has been proven--- as far as I know the only 2 companies that sell barrels with the poly rifling are BHW and Lothar Walther, both of which seem to have a history of being accurate barrels --- the new Triad barrel from ARP has shown to be very accurate and have all of the characteristics I listed above for 3 land/groove barrels--- In my opinion, the Melonite coating adds to the list of benefits for the ARP barrel as it tends to show less pressure, and more velocity than non melonite barrels --- ARP are usually less in price that the BHW and LW barrels also
You should also research the land to grove ratio if you want to know all the in's and out's of the rifling-- as some of the manufactures use deeper grove or a wider land than others
