Barrel Feed Ramp Angle?

[G.T.]

Hi Kiwi Mark! The feed ramp angle, for some reason, doesn't seem to be a finite measurement.. It just kind of appears if you follow the prints measurements on all other cuts? But, I can tell you this, as to what we have discovered at G.T. Specialties.. If you install in the barrel bore, back extending thru the chamber, a 8.8 MM drill blank / rod, or one that even more closely fits your bore, a new heavy duty Stanly Razor Knife blade will make an "EXACT" gauge for the angle present from the factory? We then measured the blade angle and it was exactly 50 degrees from the bore center line, to the ramp angle inclusive. I think most of the machinist guys here have found 46 degrees to be close to what the print says?... We cut all of ours 50 degrees and then by hand, polish to a quite full / throated finished shape. Very important you don't go to deep, as the case mouth will stop right at the ramps end in the chamber... Very tight vertical Jam will result! .......... How's that? Will that help! Best to you, til...lat'r.....GT