Am looking for a "Barrel Specs 101" type summary of the details of barrel selection, when re-barreling for, say, the 6BR caliber. If there's a great technical summary, someplace, I'm all for it. (Haven't found one, yet.)
Assumptions:
6BR caliber
Heavier, longer, VLD-type bullets preferred (100-115gr 6mm)
Distances in the 300-1000yd range
Twist rate -- I appreciate that the twist-rate needs to be fast enough to stabilize. But, is there an "optimal" range of twist-rate that'll work for certain bullet weights? Can a twist-rate go too fast, for 6BR? (ie, Some bullet makers might suggest 1:7.75" twist for a 6mm bullet of a given weight, but a barrel maker might only do 1:8" twist and 1:7" twist.) Don't understand what the limits are, here, with twist-rate.
Groove count -- With the 6BR, is there a typical or preferred groove count (ie, 4, 5R, 6) that people choose for the heavier, VLD-type bullets? The barrel makers seem to offer two or three different groove counts for the caliber. Uncertain which would make sense, depending.
Bore diameter -- (ie, .237" or .236".) Is the bore diameter going to matter that much, for a given maker, model, weight of bullet selected? For example, a Berger 108gr Hybrid Target (VLD) versus a Sierra 107gr MK versus a Bart's 103gr Hammer (VLD), etc. Do certain bullets seemingly "prefer" this or that bore diameter?
Freebore -- How important is freebore choice, if the heavier (100-115gr), longer, VLD-type bullets are going to be used? Is there a preferred freebore, where this type of 6BR bullet seems to perform better?
Barrel contour/diameter -- Plenty of choices. Uncertain to what degree, if any, barrel diameter and profile selection makes with respect to bullet performance, in the heavier-VLD, longer-distance arena. (I'm assuming, say, a lighter-weight profile 28" barrel will behave a bit differently than a heavy-Palma or straight-contour 28" barrel of similar make, but I don't know.)
Insights? A "Barrels 101" write-up somewhere?
Assumptions:
6BR caliber
Heavier, longer, VLD-type bullets preferred (100-115gr 6mm)
Distances in the 300-1000yd range
Twist rate -- I appreciate that the twist-rate needs to be fast enough to stabilize. But, is there an "optimal" range of twist-rate that'll work for certain bullet weights? Can a twist-rate go too fast, for 6BR? (ie, Some bullet makers might suggest 1:7.75" twist for a 6mm bullet of a given weight, but a barrel maker might only do 1:8" twist and 1:7" twist.) Don't understand what the limits are, here, with twist-rate.
Groove count -- With the 6BR, is there a typical or preferred groove count (ie, 4, 5R, 6) that people choose for the heavier, VLD-type bullets? The barrel makers seem to offer two or three different groove counts for the caliber. Uncertain which would make sense, depending.
Bore diameter -- (ie, .237" or .236".) Is the bore diameter going to matter that much, for a given maker, model, weight of bullet selected? For example, a Berger 108gr Hybrid Target (VLD) versus a Sierra 107gr MK versus a Bart's 103gr Hammer (VLD), etc. Do certain bullets seemingly "prefer" this or that bore diameter?
Freebore -- How important is freebore choice, if the heavier (100-115gr), longer, VLD-type bullets are going to be used? Is there a preferred freebore, where this type of 6BR bullet seems to perform better?
Barrel contour/diameter -- Plenty of choices. Uncertain to what degree, if any, barrel diameter and profile selection makes with respect to bullet performance, in the heavier-VLD, longer-distance arena. (I'm assuming, say, a lighter-weight profile 28" barrel will behave a bit differently than a heavy-Palma or straight-contour 28" barrel of similar make, but I don't know.)
Insights? A "Barrels 101" write-up somewhere?