Can't get a good crimp!

[kingemandigger]

I recently cast some lee 7/8 oz. slugs and tried to make some loads for my next shooting trip. Everything worked out as I had planed except for the crimp. I just can't seem to figure out a good way to get a tight, normal looking crimp on my shells.
Here is the recipe:

AA Shells
31 grains of Unique
Winchester AA Pink Wad with top of pedals cut off
lee 7/8 oz. slug

The funny thing is that this load is what many people recommended. I am finding that the slug sits a good 1/4 in below where a good crimp would sit. I tried using buffer (crushed walnut shells) to fill the void, felt base wads, overshot cards, etc., all of which produced a sad mangled looking excuse for a crimp. Perhaps a taller wad for a 7/8 oz. loads will work?
I am definitely open to suggestions...:-?

[kingemandigger]

Sorry, yes 12 ga

[SuperBlazingSabots]

Hello Kingemandigger, its very important to make simple tools to help out like this that I use all the time:
From a $ 1 store get the O ring set, cheap ones but get the job done.
http://i232.photobucket.com/albums/ee75/Dantebeowulf/IMG_1567_zps77efd01d.jpg (http://s232.photobucket.com/user/Dantebeowulf/media/IMG_1567_zps77efd01d.jpg.html)
Mark on wooden dowel at 7/16" for fold crimp and 3/8 for roll crimp:
http://i232.photobucket.com/albums/ee75/Dantebeowulf/IMG_1568_zpse5a362df.jpg (http://s232.photobucket.com/user/Dantebeowulf/media/IMG_1568_zpse5a362df.jpg.html)
put the O ring on and when you insert it into the hull to check for wad column you get the reading!
http://i232.photobucket.com/albums/ee75/Dantebeowulf/IMG_1569_zps48bcbd06.jpg (http://s232.photobucket.com/user/Dantebeowulf/media/IMG_1569_zps48bcbd06.jpg.html)
Always use some wad pressure to hit home all components before crimping!
20 to 30 lbs is a good starting pressure!

Hoping it helps.

Best regards,
Ajay
Blazing Sabots

[kingemandigger]

Thank you guys for the helpful input. I will be trying these ideas soon and hopefully will get good results.