Checked chamber lengh for my 1893 Spanish Mauser and got 3.165" to the lands...

[Jeffrimerman]

Hey guys,
I'm taking this ole girl to the range and getting massive groups like10" at 50 yards. I got a case and cut 2 slits and dropped a bullet on top then chambered to see where the lands pushed it back to and got 3.165". Should I be loading at 3.13" vs 3.00"? Could this be the source of my inaccuracies? I've only shot it 3 times. Once with the rear iron sight and got maybe the same or maybe 8" spread I forget. Then put on the rear sight rail which I hear isn't that great but I checked it after shooting and it's on there solid. I slugged the bore and got .276 and .275" should be the factory bore so pretty close still. I see visible crisp rifling. Has anyone noticed their old Mauser to have a "deep throat"? Did you also need to load a lot longer?

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