Dillon Square Deal Seating Die

[Sharper2112]

So I’m loading some 147gr RN Blue Bullets, and for some reason on these particular bullets my Dillon Square Deal B seating die is cutting into the tip and leaving a nice little ring indention. I am NOT a bullseye shooter, so I’m not trying to develop the most accurate load ever, but I do need reasonable accuracy because I compete in USPSA. My question is will this small amount of damage being caused by the die to the bullet affect accuracy in any meaningful way? I’ve loaded 10’s of thousands of other bullets and have never seen this before. I guess I’m just curious as to how much damage a projectile can take before you see a real noticeable difference in accuracy. Thanks

 

[Mark_Mark]

So I’m loading some 147gr RN Blue Bullets, and for some reason on these particular bullets my Dillon Square Deal B seating die is cutting into the tip and leaving a nice little ring indention. I am NOT a bullseye shooter, so I’m not trying to develop the most accurate load ever, but I do need reasonable accuracy because I compete in USPSA. My question is will this small amount of damage being caused by the die to the bullet affect accuracy in any meaningful way? I’ve loaded 10’s of thousands of other bullets and have never seen this before. I guess I’m just curious as to how much damage a projectile can take before you see a real noticeable difference in accuracy. Thanks

same! my SDB

 

[Soonerpesek]

So I’m loading some 147gr RN Blue Bullets, and for some reason on these particular bullets my Dillon Square Deal B seating die is cutting into the tip and leaving a nice little ring indention.

I don't have the SDB, but the 550......Use a VLD chamfer tool and just ease the vent hole in the seating stem.....it doesnt take much to rid the sharpish edge on it...

 

[Mark_Mark]

I don't have the SBD, but the 550......Use a VLD chamfer tool and just ease the vent hole in the seating stem.....it doesnt take much to rid the sharpish edge on it...

You Need a SBD in one caliber and only one caliber. It’s the Hipster of reloading press!

 

[Blue68f100]

So I’m loading some 147gr RN Blue Bullets, and for some reason on these particular bullets my Dillon Square Deal B seating die is cutting into the tip and leaving a nice little ring indention. I am NOT a bullseye shooter, so I’m not trying to develop the most accurate load ever, but I do need reasonable accuracy because I compete in USPSA. My question is will this small amount of damage being caused by the die to the bullet affect accuracy in any meaningful way? I’ve loaded 10’s of thousands of other bullets and have never seen this before. I guess I’m just curious as to how much damage a projectile can take before you see a real noticeable difference in accuracy. Thanks

Since the markings is on the very tip of the bullet, it's probably hitting the very end of the seating stem. Normally they contact further down the ogive. You could try the foil trick in the seating stem to get a better fit. If you have a different seating stem (say for a rifle) it may contact lower on the bullet since most rifle bullets are more stream line. Can use epoxy to make the seating stem fit the bullet. Would be nice to have a spare seating stem to modify.

 

[lordpaxman]

I guess I’m just curious as to how much damage a projectile can take before you see a real noticeable difference in accuracy.

The indented ring will help you - when the bullet starts spinning the Bernoulli affect of the indented ring will produce a lower pressure high laminar flow which allows the bullet to fly straighter and right into the A zone. Kidding.
I’ve not seen any difference in grouping at 10-20 yards when I occasionally get these rings, it’s mostly cosmetic. I also load the BB 147 RN, but the Dillon seating die (RN) I’m now using does a pretty good job. The foil trick, above, usually works and isn’t permanent. Good luck.

 

[Sharper2112]

Since the markings is on the very tip of the bullet, it's probably hitting the very end of the seating stem. Normally they contact further down the ogive. You could try the foil trick in the seating stem to get a better fit. If you have a different seating stem (say for a rifle) it may contact lower on the bullet since most rifle bullets are more stream line. Can use epoxy to make the seating stem fit the bullet. Would be nice to have a spare seating stem to modify.

So excuse my ignorance but what is the “foil trick”? Just shove a small piece of aluminum foil in the seating stem?

 

[lordpaxman]

Yes, form a loose “ball” of foil, about the diameter of the die caliber, drop in in or carefully place on the tip of a bullet and seat it. The foil is malleable enough to contour to the bullet nose. It may change the COL a bit.

Edit - clarified die caliber.

 

[Sharper2112]

Yes, form a loose “ball” of foil, about the diameter of the die, drop in in or carefully place on the tip of a bullet and seat it. The foil is malleable enough to contour to the bullet nose. It may change the COL a bit.

Ok cool, I’ll give that a try. Thanks for the info

 

[Hooda Thunkit]

The indented ring will help you - when the bullet starts spinning the Bernoulli affect of the indented ring will produce a lower pressure high laminar flow which allows the bullet to fly straighter and right into the A zone.

Oh hell yes ! Physics don't lie !

 

[Mark_Mark]

The indented ring will help you - when the bullet starts spinning the Bernoulli affect of the indented ring will produce a lower pressure high laminar flow which allows the bullet to fly straighter and right into the A zone. Kidding.
I’ve not seen any difference in grouping at 10-20 yards when I occasionally get these rings, it’s mostly cosmetic. I also load the BB 147 RN, but the Dillon seating die (RN) I’m now using does a pretty good job. The foil trick, above, usually works and isn’t permanent. Good luck.

A zone is over rated!