Triggertech Diamond/ Impact 737R Delayed Firing

LongShotTV

Private
Minuteman
Jan 17, 2025
2
2
North Carolina
HI folks, at a PRS match this last weekend there was about 5 shots out of 200 where I swear it felt like I shot a muzzleloader, and got a slightly delayed bang after hearing the trigger click. I cannot replicate it by dry firing at my bench back home.

I also recently worked up a new load for my 6 creed, the gun started speeding up and I backed off the load a bit, putting 37.8 gr of H4350 in with a berger 109 hybrid. The load shot really tight so I didn't think anything of it. But now I am wondering, should I be looking at the trigger, or could I possible have such low case fill that I got delayed shot/hang fire? I use CCI450 magnum SRP so afaik the primer needs just enough uumph to push the bullet out and start burning the powder, but while I feel confident at reloading I've never really gone down the case fill rabbit hole, and since this is a new load and the trigger only has ~1200 rounds on it, I am wondering if this could be the problem instead.

Silver lining, I flinched before the shot went off every time, so now I know I need to work on my follow through 😅

Thanks all!
 
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I have the issue with small rifle primers and creed volumes too when it’s not a super hot load. It’s why I default to large rifle creed brass now myself.
It has been in an action with a tt diamond though… but step it up from <38 to >39 and no hang fires.
 
Had two separate TT diamonds do this over a period of a year. Both on 737 actions. I was shooting several hundred live rounds a week and tons of dry firing. It first happened in a match but I could make it happen in dry fire if I was INCREDIBLY gentle to the trigger on press. I would feel the various sears release but the top sear wouldn’t….until it suddenly did. Never had a pierced primer or a load of powder dumped into the trigger or cleaned without a bore guide. Went through the recommended cleaning and testing from TT support. They did replace both triggers under warranty. I lost confidence in TT and switched to BIX. It’s the trigger, not your load or the action, in my opinion. I vastly prefer something I can take apart and clean, inspect and adjust.

ETA, I did move the triggers around to various actions and switched bolts around between three different 737s and the common element was the trigger.
 
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Thanks all, very helpful. Definitely going to take the firing pin out and clean it out, sounds like a good thing to do anyways. Will swap out the trigger since I have another lying around and see if that fixes it for now.

On a side note, learning that I have a carbon ring that was causing pressure increase, which is why I dropped the load way down. Going to take care of the carbon ring and probably push back to 38.5-39 gr of powder which should get me back to where I was before this ever happened.
 
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