08-25-2016, 06:38 PM
Keep in mind the port diameter is also an important variable.
I am not seeing the benefit of extending the length to the gas port. I recognize by moving it outboard on a longer barrel you can shorten the dwel or pulse width. But there are some operational risks....Consider... by extending the gas port down the barrel you move more toward a region where the bullet is moving faster and pressure is dropping. That said, consider the normal changes in; atmospheric conditions, bullet weights/loadings and their effect on cycling in such a narrow operational window.
I have both a 20" and a 24" Grendel and 264LBC with RLGS and adjustable gas blocks. When adjusting the 20" gas block, I used some 120 grain PPU ammo as it was cheap. When I switched to the 123 grain Hornady SST factory loads, it was undergased and had cycling issues. Now Imagine if I had optimized this barrel by moving the gas port into a less energetic region, the only option left might be drilling the gas port.
In the interest of reliability and a larger operating window, I would rather have some surplus gas and regulate it down through an adjustable gas block. Then if needed it only a click away. Just my thoughts.
I am not seeing the benefit of extending the length to the gas port. I recognize by moving it outboard on a longer barrel you can shorten the dwel or pulse width. But there are some operational risks....Consider... by extending the gas port down the barrel you move more toward a region where the bullet is moving faster and pressure is dropping. That said, consider the normal changes in; atmospheric conditions, bullet weights/loadings and their effect on cycling in such a narrow operational window.
I have both a 20" and a 24" Grendel and 264LBC with RLGS and adjustable gas blocks. When adjusting the 20" gas block, I used some 120 grain PPU ammo as it was cheap. When I switched to the 123 grain Hornady SST factory loads, it was undergased and had cycling issues. Now Imagine if I had optimized this barrel by moving the gas port into a less energetic region, the only option left might be drilling the gas port.
In the interest of reliability and a larger operating window, I would rather have some surplus gas and regulate it down through an adjustable gas block. Then if needed it only a click away. Just my thoughts.