4seventy
Firstly, it MAY not be the die that is the problem but the chamber of your gun
- at least this has to be taken into account.
If you still have the 470 I think you have (R.F. Made on the Continent), chamber dimensions
MAY need to be taken into account even more so - your chambers MAY be minimum spec,
the dies may not quite take the brass down to minimum dimensions - result - tight brass.

The other factor is Bell Ammo.

I distribute BELL Ammo in Australia have tested a lot of cases in a lot of guns
(8 x 500 Nitro's, at least 6 x 500 BP's, 12+ x 470's, 20 x 450/400's) and where the
brass has been tight, it is often a particular gun that has had minimum chamber dimensions.

In addition, the base of Bell Ammo is thicker in the base and I have found it may need to be Full length
re sized to get it in the chamber and then it is fine after this.

Hope this helps.

Email me if you have any questions.

500 Nitro