Yikes! Only 1200 fps?
I was also shooting these from my 18" Ruger 77/44 carbine without issue..
These loads were REALLY spittin' flame from the Taurus cylinder gap and porting.
So it's likely a combination of having too tight of a crimp, tight forcing cone, and hot-loaded cartridges that resulted in the excessive build-up of copper/lead flash.?
I test-fired around 25 of these on paper from the Taurus at the local range before heading out to eliminate any targets of opportunity, like varmints, and then later on to break things & blow stuff up on my friend's property using these loads. [they make a mess out of various fruits and veggies! LoL] - they weren't keyholing or acting strange on paper
I'll perform a visual inspection on the cylinder/barrel later on and see what's up
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