Dave,
There is ALOT at play here. First of all is the powder it's self. Hodgdon does not build their powders, and depending upon who is building a paticular powder; the speed may move slightly. Therefore depending upon when someone got the info for publishing, there is a difference. Also as you mentioned the specific jackets have different "Slickness" values, and that affects pressure.
The biggest improvement I have found in all of my Savages(15+ years of Savages) is the COAL. Savages tend to have long throats. The FP's in paticular have VERY long throats. If you don't have one, go and buy a inertia bullet puller(looks like a hollow hammer). Take and EMPTY, resized case and seat the bullet, WAY far out. Drop it in the chamber and close the bolt. This will force the bullet in the lands, and seat it farther in the case. Then open the bolt, take the cartridge out and stick it in the calipers to measure the COAL. Now you know where THAT paticular bullet contacts the lands. The general area that MOST bullets shoot really good is with about 1/32" jump to the lands.
I think you will be surprised how much longer the cartridge for your gun is than standard.
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