It depends on the seater plug. If you have a conical plug without an internal plateau (like in the case of the Redding Competition Seater), the harder a bullet is to seat the deeper the bullet will swage into the plug. When I seat soft core bullets into hard cases, such as WIN, I see considerable swaging of the bullet nose. I get completely mangled bullet noses when seating into RWS brass because it is so hard. With other swatted, such as RCBS, the very tip of the bullet will bottom out against the internal flat of the seater plug and wont swage into the plug. The bullet will seat to the exact same OAL every time.
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9MM lack of neck tension FC brass
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It depends on the seater plug. If you have a conical plug without an internal plateau (like in the case of the Redding Competition Seater), the harder a bullet is to seat the deeper the bullet will swage into the plug. When I seat soft core bullets into hard cases, such as WIN, I see considerable swaging of the bullet nose. I get completely mangled bullet noses when seating into RWS brass because it is so hard. With other swatted, such as RCBS, the very tip of the bullet will bottom out against the internal flat of the seater plug and wont swage into the plug. The bullet will seat to the exact same OAL every time.
beatledog7
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OK, I have seen that swaging effect with soft-nosed .38/357 bullets, and I guess it does vary the OAL a tiny bit when I load mixed headstamps.
The tighter fitting case makes the bullet harder to press in, and if that bullet has a rounded lead nose it can be slightly deformed. The distance between the floor of the shell holder and the seating surface of the plug is always the same, but the "throw" of the ram is partially taken up in compressing/swaging/deforming the bullet's nose, making the round's OAL a bit shorter.
That may not be expressed exactly right, but I get it now.
The tighter fitting case makes the bullet harder to press in, and if that bullet has a rounded lead nose it can be slightly deformed. The distance between the floor of the shell holder and the seating surface of the plug is always the same, but the "throw" of the ram is partially taken up in compressing/swaging/deforming the bullet's nose, making the round's OAL a bit shorter.
That may not be expressed exactly right, but I get it now.
rcmodel
Member in memoriam
Not if you have a seating stem that fits the bullet profile..and if that bullet has a rounded lead nose it can be slightly deformed.
If you don't have one, get one.
About all the reloading die manufactures have a selection of seating stems for different bullet shapes.
Some, like RCBS, will even make a custom stem to fit specific bullets you may have that are deformed by the seating stem.
rc
The tighter fitting case makes the bullet harder to press in, and if that bullet has a rounded lead nose it can be slightly deformed. The distance between the floor of the shell holder and the seating surface of the plug is always the same, but the "throw" of the ram is partially taken up in compressing/swaging/deforming the bullet's nose, making the round's OAL a bit shorter.
Xactly. I have seen OAL variance of .010"+ between different brands of brass.
Not if you have a seating stem that fits the bullet profile.
Too many different profiles out there. That's why many dies use a conical seater plug. The best solution is to have a perfect fitting plug, but the most practical solution is to Dort your brass.
gamestalker
member
As RC stated, the crimp for an aL case does nothing to increase neck tension and is only intended to remove the belling of the mouth, as in bring it back to it's prior diameter.
If the shell holder is touchng the die and it's hit and miss with all the brass, not just FC, you have a problem with the sizing die, not brass, bullets, or expender plug.
And regarding belling the brass, I have been seating jackted bullets for several decades without ever belling the case mouths, so as to achieve maximum neck tension. All this requires is to make sure the incside of the case mouths have been nicely chamfered and the bullets will seat smooth as silk, and it saves a bit of time that would other wise be applied to adjusting your taper crimp die.
GS
If the shell holder is touchng the die and it's hit and miss with all the brass, not just FC, you have a problem with the sizing die, not brass, bullets, or expender plug.
And regarding belling the brass, I have been seating jackted bullets for several decades without ever belling the case mouths, so as to achieve maximum neck tension. All this requires is to make sure the incside of the case mouths have been nicely chamfered and the bullets will seat smooth as silk, and it saves a bit of time that would other wise be applied to adjusting your taper crimp die.
GS
beatledog7
Member
About all the reloading die manufactures have a selection of seating stems for different bullet shapes.
Some, like RCBS, will even make a custom stem to fit specific bullets you may have that are deformed by the seating stem.
Once I decide on a standard load, a bullet I'm gonna buy a billion of, I'll do that. For now, I'm just being as careful as possible. I can't afford a custom stem for every bullet I want to try.
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