Encore. Got the forend and scopebase from Marty at Haus of Arms. Forend is heavy contour, standard length. Looks odd on a 20" barrel. Trying to find out if they make a spotter or carbine forend. No luck so far. May have to cut 3 or 4" off and remount sling stud...
Bought 40 rounds of Winchester 145fmj to plink with while breaking in the barrel. Have experienced 2 blown primers, 5 excessively flattened primers, and 8 rounds that looked like they were swept up off the floor after several days (although they did clean up fine with windex). After noticing the primers, I decided to measure the cases. Had a minimum 1.686 to maximum 1.710. Blown primers were in the middle of the lengths with what I would say as normal looking fired primers. I measured COAL and they were all over the place too. Have only shot 2 180 power points and they were normal and in spec. Many of the unfired 145's are obviously over crimped, visible with the naked eye. I would advise people to be careful with the 145fmj. Going to get several more 180's fired next couple of days to make sure they aren't over pressured. Don't know where to post this to get the word out, moderators please feel free to move or repost as needed for the benefit of the people. 17 of the 18 145's did hit where expected and fired good groups.
Location: 3 miles NW of Brownells retail store and they keep me broke!
I'd be sending those spent rounds back to Winchester and asking for an explanation. Winchester has some serious quality control issues to address.
Since the 350 legends headspaces off the case mouth it is critical that the cases be the same length for the crimps to be consistent. An over crimped round in any chambering that headspaces off of the case mouth can lead to excess pressure. In many firearms an over crimped case will move forward enough that the firing pin will not strike the primer hard enough to fire it. However the TC once shooters (at least the ones that I have had) are not known for sloppy tolerances and thus the crimped part of the round could reach into the throat and still be positioned so that the firing pin will reach the primer. The case neck cannot expand properly and pressures spike.
This is absolutely no fault of TC's but clearly a Winchester boo boo!
I had the exact same issue with the 450 Bushmaster round when they came out. I only roll my own now!