11-30-2021, 12:19 PM
Mate,
The deal is fired cases are only getting sized on the outside of the neck. Without the expander ball you get more neck tension than if the expander ball is used. With outside neck sizing the necks still come out nice and round. A Forster FL sizer without the ball it is .004" of neck tension. With the ball it is .0035" so not much difference.
With a Redding die, without the ball it is a whopping .009 of neck tension, but with the ball it is only .0005" so a huge difference between using the ball and not.
Not necessary for bolt guns but in semi-autos the gorilla grip is preferred.
Sometime back I bent the depriming pin and stem and had to get a replacement. BRT Supplies did not have a Grendel decapping unit so I got a 6PPC which uses the same stem but smaller ball. I only need the stem to decap so I may as well leave the 6mm ball on it even though it doesn't touch the inside neck of the cases. If ever a case has a decent ding in it the 6mm expander ball will round it out enough that the bullet being seated will act as a mandrel.
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The deal is fired cases are only getting sized on the outside of the neck. Without the expander ball you get more neck tension than if the expander ball is used. With outside neck sizing the necks still come out nice and round. A Forster FL sizer without the ball it is .004" of neck tension. With the ball it is .0035" so not much difference.
With a Redding die, without the ball it is a whopping .009 of neck tension, but with the ball it is only .0005" so a huge difference between using the ball and not.
Not necessary for bolt guns but in semi-autos the gorilla grip is preferred.
Sometime back I bent the depriming pin and stem and had to get a replacement. BRT Supplies did not have a Grendel decapping unit so I got a 6PPC which uses the same stem but smaller ball. I only need the stem to decap so I may as well leave the 6mm ball on it even though it doesn't touch the inside neck of the cases. If ever a case has a decent ding in it the 6mm expander ball will round it out enough that the bullet being seated will act as a mandrel.
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