I have a couple of new barrels to have chambered, one in a 243 and the other a 7RM. Should I use the factory recoil lug, or invest in an aftermarket? If upgrading would be appropriate, which ones should I consider and why? The 243 will be a 10 twist to shoot the 75gr V-Max for varmints, and the 7mm will be for LR & ELR shooting at steel and hunting and a 9 twist for the 168's and 180's. Thank you for your input.