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Joined: 16 Aug 2015 Posts: 23 Location: USSR of NJ

Recipe : win poly (once fired). BP SG-16, 19gr Unique, win209, 1oz mixed 7.5, 8, 9.

When I start crimp the win poly it has difficulty getting a good start. Then the final crimps gets a fold on one of the 6. If I hold the crimp starter and guide it down level it seems to work better. Ive inspected it and see nothing visually wrong ???

Member Joined: 30 Nov 2011 Posts: 1695 Location: Minnesota

You don't say what machine you are using. Are you using a starter with the right number of points?(6 vs Cool

. Does the starter spin freely and tilt some side to side by hand?

Joined: 16 Aug 2015 Posts: 23 Location: USSR of NJ

Im sorry.... I am using a 16 ga MEC 600 jr.
Yes, it spins and moves side to side as normal. I have tried adjusting it multiple times. If I hold it still and level as it goes down I seem to get the best pre-crimp.
However... one or two always seem to be higher than the other four. They end up getting flattened or crushed in the final crimp. I can get a few good crimps then one will get messed up. I'm wondering if its just the crappy win poly hulls ?
I know they will still go "Bang" but id like to get it better... would a brass starter help?

Joined: 16 Aug 2015 Posts: 23 Location: USSR of NJ

Im sorry.... I am using a 16 ga MEC 600 jr.
Yes, it spins and moves side to side as normal. I have tried adjusting it multiple times. If I hold it still and level as it goes down I seem to get the best pre-crimp.
However... one or two always seem to be higher than the other four. They end up getting flattened or crushed in the final crimp. I can get a few good crimps then one will get messed up. I'm wondering if its just the crappy win poly hulls ?
I know they will still go "Bang" but id like to get it better... would a brass starter help?

How many folds is the starter made to make. and is it the same as the folds on the case?
If tey are then look for a better style crimp starter to use on the win hulls.

I would suggest screwing the crimp starter down 1/2 to 1 full turn.
For the metal crimp starter put a washer on top of the crimp starter.

Mike

P.S. Do you have the metal crimp starter or the injection molded black crimp starter?

P.S.S. See pages 9 & 10

https://www.mecshootingsports.com/Images/document/600jr.pdf

Joined: 16 Aug 2015 Posts: 23 Location: USSR of NJ

I went and ordered a brass crimp starter from BP, just got it installed and it cured the problem. I now have beautiful crimps, cant wait to show them the Grouse in Maine . Thanks for all your help guys !