Re: 6mm Remington
Idaho, I shoot a Rem 40X that first had a 27 1/2 inch 1 in 12 twist 6 Rem tube. Did a year of target and P-doggin and found it to be awesome, but it wouldn't handle anything heavier than an 85/87 grain bullet. Found that by shooting a 6.5/284 and using a ballistic calculator that the bigger heavier bullet is better because of the wind. That said I rebarreled the 6 rem to a 1 in 8 twist 6 rem to shoot the 105 Lapua and 107 Sierra's. What I found was that even in a decent wind, the 70/75 grain ballistic tip style bullets and their greater speed in actual use seem better to 650 yards or so. The big bullets also recoil more and seeing your impact's isn't very easy. Consider the above suggested muzzle break concept. While I shoot Hart's on my centerfires, I shoot a Lilja .22 LR on my 10/22 and find it totally awesome! Dan's tubes are amongst the very best. The 6 Rem is generally under rated by the shooting public, but not by real shooter's with experience who consider it to be the best 6mm cartridge. The bigger wildcats (6mm - 06, 6/284, 240 Weatherby) will burn out without really doing anything better or signifigantly faster! Enjoy your project.