My customized Savage 12FV has a jam length COAL of 2.825" with the 178. Your 10FP sounds like it's got quite the long throat. Is this a centerfeed action? If you've got a throat that long, you might consider trying some 208 AMAX's. They perform superbly at long range (especially when pushed with RL17), and if you've got the throat and action length to run them, you might look at that option. For reference, I use the Stoney Point OAL (BTO-Base To Ogive) gauge (now Hornady LNL), and my BTO measurements for both the 178 and 208 AMAX are 2.197 and 2.222, respectively. This gives the 178 a jam length COAL of 2.825", and the 208 a jam length of 2.947". My rifle doesn't seem to care what COAL the 178's are at; they run 1/2" or better with everything from .005" to .030" off the lands. Good luck with your loads!
Kevin
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