Good catch. You wouldnt happen to have a picture of this "collor" set up would you?John
Have you noticed any performance changes?
One of the local lads already managed to make 150 fpe with some valve and TP work.
Pretty impressive already, without hammer spring tension increase - in effect shifting an actual shot string bell curve further right on the FPE scale. Very nice.I look forward to hearing more details on what exact "valve work", etc you are doing.
These are increasingly interesting observations and results. Your strings are looking better and better.My .357 Rainstorm is hitting a peak of about 133 FPE with the JSB 78 grains, but that is with the hammer spring pre-load cranked in as far as possible. The shot string on that setting is the classic downwards slope - no bell curve or plateau at all - and I would guess (haven't chronied in a while) that the total FPE over 8 shots is probably less than your string above.(I haven't done any of the porting, alignments or other things that you are detailing here.)With this latest string, how far in is your hammer spring pre-load? Did you change it at all from the factory setting (either in or out) for this string?EDIT: Here's a typical FACTORY setting string for a .357 Rainstorm. This shows how much improvement you've already gained.78 gr:1. 820 2. 822 3. 807 4. 802 5. 804 6. 786 7. 771 - Peak FPE above is 116 FPE.- The same gun that shot this string shot a 93 grain bullet at 799 fps for 132 FPE - so your own Rainstorm is technically probably an 150 FPE gun already (although I know that your goal is to reach that with the JSBs at mid 900 fps).