Canuck Bob
05-29-2011, 12:52 PM
My new Winoku 92 32-20 slugged at .311 groove +0/- .0001 on all lands, Chamber neck .330 +/- .0001. Calibrated Moore and Wright mic at room temp. No heat transfer to mic or slug. Two slugs measured per instructions, dead soft sinker (thumb test though). The lands are .301 on the mic and a Polish workshop vernier caliper so maybe a broader tolerance here, they are narrow and I was a little clumsy here (old eyes and arthritic fingers). For reference my early training included lathe room operator for Timken Roller Bearing. I was required to work and measure to a tenth.
The barrel has no throat except a very sharp ramp from chamber lip to rifling (barely visible). Narrow lands and wide grooves. The barrel and throat are concentric based on the evenness of the grooves. Bore and rifling are very smooth for first 1/2 inch and crown. After close examination the fit and finish of all machining is very good, better be for the price paid!!!
Rem factory lead bullet case measures .3255 loaded neck. With new unfired Rem case an XTP bullet (.3114) carefuly oiled and inserted backward after chamfering neck measures .3260 giving about .004/.0045 to interference fit for case neck and chamber (.330) based on these bullets. I'm guessing the XTP neck would gain that half thou. when ran through a sized case and seating die.
How would you guys size this for an NOE 311316 for this rifle, please?
Would anyone bother to go to the hassle of adding a small throat and softer leade?
Obsessive Compulsive Casting Detail Disorder info for folks afflicted like me and track these things.
The barrel has no throat except a very sharp ramp from chamber lip to rifling (barely visible). Narrow lands and wide grooves. The barrel and throat are concentric based on the evenness of the grooves. Bore and rifling are very smooth for first 1/2 inch and crown. After close examination the fit and finish of all machining is very good, better be for the price paid!!!
Rem factory lead bullet case measures .3255 loaded neck. With new unfired Rem case an XTP bullet (.3114) carefuly oiled and inserted backward after chamfering neck measures .3260 giving about .004/.0045 to interference fit for case neck and chamber (.330) based on these bullets. I'm guessing the XTP neck would gain that half thou. when ran through a sized case and seating die.
How would you guys size this for an NOE 311316 for this rifle, please?
Would anyone bother to go to the hassle of adding a small throat and softer leade?
Obsessive Compulsive Casting Detail Disorder info for folks afflicted like me and track these things.