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Well, I made a selection of new crimps.
One was without crimp as a sort of control.
This cartridges OAL was 40.75mm starting OAL, 41.23mm after the first shot and 41.94mm after the second. After this second shot, I scrapped this set and shot the lot: clearly there was no retention and continuing the experiment was fruitless.
The next was 0.25 crimp with OALs as follows:
40.71mm, 40.78mm, 40.89mm, 41.11mm, 41.10mm, 41.18mm.
Compaing these results and the OAL values in my OP, it looks like the 0.25 turn crimp is the most effective although not particularly effective....
It seems that these bullets, with their waxy coating and no cannelure are not ideal, but they are what I have.
Lesson learnt here is once the cartridges are in the cylinder, they don't come out again until they've been fired!! that way I can be sure that the bullet on the 6th shot will only have crept forward by about 0.5mm...
When I get some 300gr bullets this process is going to be interesting!!
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