I recently acquired a .260 Remington on a Barnard action from a Hide member. He told me to set the leade .015 off the lands. The rifle is shooting .393 MOA at 100yds now with the suggested 2.60 overall length in my Hogdon manual. I think it will do better. I hate to admit it but I don't know how to determine leade. Can anyone out there help?
- Thread starter robdub
- Start date
Re: .260 Remington leade
Just start a case into the sizer die, size maybe 0.020" of the neck so it'll hold a bullet but allow bullet to slide.
Leave bullet long, like an OAL of 2.950", and then slowly close bolt. Lands will push bullet back into case, ease case out of chamber. You'll want to hold case so head stays against bolt face, then ease round off of bolt. Measure OAL and write down that length. Repeat half dozen or so times, make sure you are getting same length each time +/- couple thousands anyway. I'd suggest you jump more along the lines of 0.040".
HTH
Just start a case into the sizer die, size maybe 0.020" of the neck so it'll hold a bullet but allow bullet to slide.
Leave bullet long, like an OAL of 2.950", and then slowly close bolt. Lands will push bullet back into case, ease case out of chamber. You'll want to hold case so head stays against bolt face, then ease round off of bolt. Measure OAL and write down that length. Repeat half dozen or so times, make sure you are getting same length each time +/- couple thousands anyway. I'd suggest you jump more along the lines of 0.040".
HTH
Re: .260 Remington leade
unloaded case,neck resized only the necessary amount to avoid the bullet can slip inside without a minimum of effort,bullet inserted only the minimun necessary to avoid his falling outside_close slowly the bolt_the bullet will be pushed gently backward,inside the case_ that's the leade measure,and will be more faithful if you can find the exact compromise (between too much small and too much large) about the neck sizing above_ or you can buy the proper tool,now branded Hornady,if I'm not go wrong (recommended,+ instructions)_
unloaded case,neck resized only the necessary amount to avoid the bullet can slip inside without a minimum of effort,bullet inserted only the minimun necessary to avoid his falling outside_close slowly the bolt_the bullet will be pushed gently backward,inside the case_ that's the leade measure,and will be more faithful if you can find the exact compromise (between too much small and too much large) about the neck sizing above_ or you can buy the proper tool,now branded Hornady,if I'm not go wrong (recommended,+ instructions)_
Re: .260 Remington leade
I seat a bullet long in a piece of brass that I FL sized. Spin the bullet in some 0000 steel wool to polish it. I chamber the round then extract it and inspect for marks left by the rifling. Seat .010 deeper repolish and repeat until the rifling marks are no longer visible. I now know that I am within .010" of the lands. I will then pull the bullet or use another case and set it to the previous setting minus .001" and polish and seat .001" at a time unitl the rifling is just barely and I mean barely discernible. I call that the lands and go from there. I always use a Sinclair bullet comparator to measure base to ojive as OAL is useless unless checking for mag length because ojive to tip will vary bullet to bullet. But with good seater dies case head to ojive will be */- .001" each round.
Using the Hornady tool or trying to seat a bullet using the rifling and closing the bolt has always given me varying results. YMMV
I seat a bullet long in a piece of brass that I FL sized. Spin the bullet in some 0000 steel wool to polish it. I chamber the round then extract it and inspect for marks left by the rifling. Seat .010 deeper repolish and repeat until the rifling marks are no longer visible. I now know that I am within .010" of the lands. I will then pull the bullet or use another case and set it to the previous setting minus .001" and polish and seat .001" at a time unitl the rifling is just barely and I mean barely discernible. I call that the lands and go from there. I always use a Sinclair bullet comparator to measure base to ojive as OAL is useless unless checking for mag length because ojive to tip will vary bullet to bullet. But with good seater dies case head to ojive will be */- .001" each round.
Using the Hornady tool or trying to seat a bullet using the rifling and closing the bolt has always given me varying results. YMMV
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