SL900 Crimp Issue With STS Nitro
Quote from Reloader on October 26, 2013, 2:23 amapproximately 1 in 5 shells are getting a bad crimp.
The issue seems to be stemming from station 4 (the second to last station) rather than having a nice start at a 5 start crimp with about 60% closure, parts of the crimp will look slightly chewed up, resulting in a messy 3 or 4 point star.
for those that crimp cleanly I'm thinking there is a bit too much excess material in the crimp; the center of the crimp seems too cramped/tight.
If it helps, my current recipe is:
Rem nitro hulls
1-1/8 oz downrange Rem. fig8 wads
19 gn Alliant Promo powder
Nobel Primer
1-1/8 oz #7-1/2 shot
approximately 1 in 5 shells are getting a bad crimp.
The issue seems to be stemming from station 4 (the second to last station) rather than having a nice start at a 5 start crimp with about 60% closure, parts of the crimp will look slightly chewed up, resulting in a messy 3 or 4 point star.
for those that crimp cleanly I'm thinking there is a bit too much excess material in the crimp; the center of the crimp seems too cramped/tight.
If it helps, my current recipe is:
Rem nitro hulls
1-1/8 oz downrange Rem. fig8 wads
19 gn Alliant Promo powder
Nobel Primer
1-1/8 oz #7-1/2 shot
Quote from Reloader on October 26, 2013, 5:31 pmsorry quick correction: I am crimping with the 8 point star crimp, and the problem crimps result in a messy 4 or 5 star crimp
sorry quick correction: I am crimping with the 8 point star crimp, and the problem crimps result in a messy 4 or 5 star crimp
Quote from Reloader on October 29, 2013, 3:10 amIn my experience, crimp issues come down to one of two problems, component stack up (being either too high or too low) or the per crimp not being correct. I can't speak to your selection of components and their stack up height but you should strive for a pre crimp such that the closed hole is about the size of a pencil eraser. If your getting significant swirl in your final crimp, I'd experiment with opening it up a bit.
I'm reloading STS hulls but using 7/8oz shot and the CB-0178 wad and it crimps like factory loads.
In my experience, crimp issues come down to one of two problems, component stack up (being either too high or too low) or the per crimp not being correct. I can't speak to your selection of components and their stack up height but you should strive for a pre crimp such that the closed hole is about the size of a pencil eraser. If your getting significant swirl in your final crimp, I'd experiment with opening it up a bit.
I'm reloading STS hulls but using 7/8oz shot and the CB-0178 wad and it crimps like factory loads.
Quote from Reloader on October 29, 2013, 5:36 pmSTS hulls tend to be more irregular in length than other brands of hulls. Use calipers to sort through a dozen or so fired STS hulls, select the longest ones, and use those to adjust the start and final crimp. That should correct this.
STS hulls tend to be more irregular in length than other brands of hulls. Use calipers to sort through a dozen or so fired STS hulls, select the longest ones, and use those to adjust the start and final crimp. That should correct this.