RCBS 7mm 145SIL
- Thread starter Intheshop
- Start date
fiver
Well-Known Member
the part that scares me is when you gotta open one after it's crammed in like that.
you can't just give it the AK stomp and carry on.
one good thing is you know you got engraving on the nose, the flip side is your probably pushing the bullets down in the case or mushing up some lead at the same time.
but you have kind of figured out the trick to force feeding these little guys down the accuracy pipe at higher than normal speeds. [I'd dare say higher than normal RPM's, but they got nuthin to do with it until all the work is over]
they really, really rely on that nose section to take the rifling as hard as possible [with good bullet alignment]
anything less and life sucks.
you can't just give it the AK stomp and carry on.
one good thing is you know you got engraving on the nose, the flip side is your probably pushing the bullets down in the case or mushing up some lead at the same time.
but you have kind of figured out the trick to force feeding these little guys down the accuracy pipe at higher than normal speeds. [I'd dare say higher than normal RPM's, but they got nuthin to do with it until all the work is over]
they really, really rely on that nose section to take the rifling as hard as possible [with good bullet alignment]
anything less and life sucks.
It's interesting for sure. Learned a cpl things and that in itself, is fuel for the passion. Also reinforced a thing or two.
One thing is.... despite what folks may think,how well fitted the top punch is,makes noticeable if not always,measurable change to the bullets nose.... in this case,rather long bore rider. Where I may have trouble measuring "tenths" along the nose/ogive with repeatable precision.... there's no denying a change when it becomes a forced jam on chambering a rd.
Further,preconceived notions that a crimp is not ever needed on bottleneck cartridges. I crimped these about a "7" on a 10 scale so there would be some support. Along with the neck's sizing.... which was thought about before the 1st bullet was even loaded. Being on the edge of abuse of the bolt isn't something most folks consider when discussing such things.
What's happening is..... MAINLY due to this bullets long nose,if the top punch dosen't fully support.... it will get bumped up. I knew this was going to happen,and did it anyway. And it happens without even straining a 450 Lyman. Generally, there's two types or effects? when sizing these long bullets(not so prevalent on short or pistol bullets).... if there's not much reduction in diameter going on,it usually just a smooth stroke in/out of H die. If however,for one or all of several reasons,there's resistance into the H die you can get the other type or effect of the action.
On the latter, there's a hump,or hitch in the stroke. An X/Y force curve would show it well. The force ramps up,then you break through the resistance...... goes easy for a period then....hits home against the depth stop where the force shoots back up. This last part is crucial in the process. It can get as deep conversationally as anyone wants to take it.... but like certain metrology systems or processes can get boring. Easier to just size,or chamber another bullet. Because this is where the rubber meets the rd so to speak.
Am going to wait for the ordered factory top punches.... and will probably start making one as well. I do know what's needed on the ho made one though.
One thing is.... despite what folks may think,how well fitted the top punch is,makes noticeable if not always,measurable change to the bullets nose.... in this case,rather long bore rider. Where I may have trouble measuring "tenths" along the nose/ogive with repeatable precision.... there's no denying a change when it becomes a forced jam on chambering a rd.
Further,preconceived notions that a crimp is not ever needed on bottleneck cartridges. I crimped these about a "7" on a 10 scale so there would be some support. Along with the neck's sizing.... which was thought about before the 1st bullet was even loaded. Being on the edge of abuse of the bolt isn't something most folks consider when discussing such things.
What's happening is..... MAINLY due to this bullets long nose,if the top punch dosen't fully support.... it will get bumped up. I knew this was going to happen,and did it anyway. And it happens without even straining a 450 Lyman. Generally, there's two types or effects? when sizing these long bullets(not so prevalent on short or pistol bullets).... if there's not much reduction in diameter going on,it usually just a smooth stroke in/out of H die. If however,for one or all of several reasons,there's resistance into the H die you can get the other type or effect of the action.
On the latter, there's a hump,or hitch in the stroke. An X/Y force curve would show it well. The force ramps up,then you break through the resistance...... goes easy for a period then....hits home against the depth stop where the force shoots back up. This last part is crucial in the process. It can get as deep conversationally as anyone wants to take it.... but like certain metrology systems or processes can get boring. Easier to just size,or chamber another bullet. Because this is where the rubber meets the rd so to speak.
Am going to wait for the ordered factory top punches.... and will probably start making one as well. I do know what's needed on the ho made one though.
Unusual because,it's a new target. This is fancy $$$$$ paper that can be hosed with water and it doesn't even blink. I consequently don't change it,just keep blasting holes in it. Then you go for the heads of the finish nails st the corners before finally,go hang two more.
There is another target butt above this one.
There is another target butt above this one.
Man,need a go fund me page,or whatever it's called. Want to load nickel Federal cases for this 7-08. They make one loaded,"lead free" with a solid copper? ..... which will get pulled and donated to whomever wants them.... then load up some RCBS 153's.
But them things be dang $$$. Midway is 35 + 10 shipping for 20.
But them things be dang $$$. Midway is 35 + 10 shipping for 20.
