I set two boxes of CCI SV in my loading block for my S&W 617 today to see how it works. The old stuff use to run with no problems and I could fire about 200 rounds before I had to clean the cylinders. Big Surprise this morning.
I started getting FTFs on the first cylinder and it never got better than that.
I only fired 50 rounds of the 100 I had set aside and had 13 FTFs. My 617 will shoot CCI Mini Mags all day long without a hiccup.
Before I realized it was just an ammo problem I took the gun apart and replaced the mainspring with a heavier one from Jerry Michulec. It didn't help. I got home and took out the firing pin to see if it had broken but it's still good.
Then I remembered it was the CCI SV. Well, at least I know my gun is totally clean now and the trigger pull is set to a decent 8.5 pounds on average with my Lyman Digital Scale. I'm going to set the SV aside for my Black Mamba and see how it works there.