by msd4141 » Sun Aug 02, 2020 1:33 pm
Hello Everyone,
I finally got around to setting up to load the 275 TSX. I have read, and reread the different posts about this bullet. I am reloading with Lil Gun, or H110 for My AR 15 with a 18" Tromix Barrel. I windowed a mag back in January, and it turned out good. I was setting up my Hornady 4 die set, and loaded a 3 dummy rounds to 2.33 I set my taper crimp die to crimp at .472 driving the taper crimp into the top band that was almost completely buried in the once fired Hornady case that was tumbled in stainless steel media, then full length resized. I did not bell the case mouth as the 275 TSX has a taper at the bottom, and a bell is not needed.I tested the dummy rounds in my AR by cycling from the mag and letting the bolt slam home, like it would in normal firing. The bullet creep was evident on all 3 dummy rounds. About .012 to .014 longer. COAL was 2.33, then went to about. 2.45 after cycling. I don't have a side crimp die. I also tested some dummy rounds with the grooves completely buried with a COAL of 2.25 (as Barnes and Hodgen states) and cycled the dummy rounds, again same thing with the bullet creeping. I decided to go outside and cycle some factory Hornady 250g FTX which COAL factory loads were about 2.52 before testing, and they crept about the same as the TSX dummy rounds .010 to .012 longer with COAL at about 2.64
I guess my question is, should I load to 2.33, taper crimp and live with the creep, or should I loads to 2.25, taper crimp and live with that creep? I know people are loading longer to get more speed from the 275. The barnes and Hodgen sites both list 2.25 COAL with lower charge weights than what I see people are using here. I know that is because the bullet is seated deeper. I'm really trying to figure out what to do. Does the creep matter a whole lot? Should I use the 2.25 COAL and taper crimp and let it creep like the factory rounds? I want to be safe. I usually follow the manuals, start low and work up to be very safe. (I like my hands and eyes ) Thanks for any insight to this, and I will keep reading. Marc