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Ditto this.Your load is too hot.
Just loaded a handful of 125gn XTPs with 19.5gn of w296. Im gonna see how those performLooks like you are using the LEE manual, you might get a second one like the Hornady or Lyman. Neither list the 110 bullet being used with H-110/W-296. The Lyman and others list a a most accurate and a hunting load as recommended. and can find good information working up to those. I don't thing Lee tests all those loads I say this because there no test fixture information like others use. Just as a point of reference I have at least 10 different Reloading manuals. Just checked the Hodgon manual and it doesn't list H-110(296 is the same as H-110) for a 110gr bullet either.
Dirty, dirty, dirty........could we see some pictures of the offending cases?
Aloha, Mark
Wait, It's not unburned powder under the extractor and such, its sooth. There is tons of sooth that goes past the cases and back onto the had/firing pin/recoil shield area.
If you look at the fired cases in the picture you can see the soot that came all the way down the sides of the case upon firing and dirtied the case head.