I have cast quite a few different molds in the Keith style and have been playing around with crimp depth and using different crimp dies.
Molds:
1) lyman 429421
2) RCBS 44-250-K. Drops about 262 grn with carnuba blue and COWW +2% tin
Dies:
Lee , RCBS, Lyman. Dillon, Etc
Bullets sized to .430, carnuba Blue lube , heavy roll crimps, cylinder throats all exactly .430, no bulges in brass after crimping operation.
I have experienced no bullet jump when using a heavy roll crimp and a med-heavy charge of several powders. Unique and Blue dot are so far my favorites , due to shortages of everything else and I had plenty on hand. I follow very closely the guidance of printed load data and never exceed max loads. Im more looking for med loads for 100-200 yd range target work.
While using the exact same load in a few different dies i found pressures spiked, with blue dot and had 2 split cases. New starline brass. Kinda made me nervouse for my Smith 29-3 8 3/8" and 4" magnums. All rounds are crimped in crimp groove.
Does anyone have a diagram or information regarding the depth of roll crimp vs excessive pressure?
Can the lee factory crimp die cause excessive crimp?
How heavy a roll crimp is too heavy?
I am just getting set up to load for 38/357 using 38spec brass, NOE 360-172-swc- BC1 PB. And Arsenal molds 358-158- kt. Plan to size to throat size .358, 4" Smith 681, well used NYSP revolver.
Any guidance would be appreciated concerning , well, anything I can learn from.