Originally Posted by msalm
I recently finished my 338 Edge and throated it longer for the 300gr Sierra's as the action is a single shot Nesika. Right now I'm just shy of the lands and the start of the bearing surface is just below the neck/shoulder junction of the case. Just wondering where some of you gravitate to in some of the higher capacity cartridges when loading for them. What kind of jump to the lands do you like to see.... I'm just off the lands about .010 now, and I'm wondering if it should be closer to .040-.050. Accuracy was not bad, but I'm expecting better. Barrel is a 30" Rock 1-9.4" twist with a muzzlebrake I made myself. So far 5 shot groups are 4" at 600 yards, but in all honesty I was not the steadiest when shooting. Laying prone with the bipod I didn't have a rear bag and was limited to about a 2" hold, or at least that's about what I saw in the scope.
Will seating deeper on these big boys reduce pressure somewhat? Decrease SD? I'm curious.
First, let the rifle tell you where it wants the bullet seated by doing some diagnostic testing. I would expect that you will come in between .020" and .050" distance of the ogive to the lands when shooting high performance loads. For example, the 338/378 I use likes the SMK bullets (BC .768) at .030" off the rifling at 3011 fps.
With the 280 grain Aluminum tipped bullets (BC .878) from Gerogia, the same gun likes those at .050" off the rifling at 3130 fps using the same powder lot as above.