I'm posting this just in case anyone else has looked at their dwindling supply of Clays, their large supply of Trail Boss, and wondered "Can I make 40 minor with Trail Boss?" I know someone who tried TB in 40 and reported no negative effects, but did not have chrono data. So, I did some weighing and measuring to determine that 3.2-3.3gn of TB is the max no compression load for my brass/bullet/OAL. I loaded one batch slightly under the no compression limit, one batch slightly over, and tested it for speed and function in a Production legal Glock 35.
Please keep in mind that this data is for informational purposes only and should not be used by anyone for anything. Seriously. Do not use this.
(Glock 35, 180gn Xtreme RNFP, 1.135 OAL, 58 deg, 10 shots over chronograph at 20')
3.0gn TB - 602 fps (SD 18, ES 52, PF 108) 11lb recoil spring will not reliably cycle.
3.5gn TB - 661 fps (SD 23, ES 52, PF 119) 11lb recoil spring works, 13lb not reliable.
The ES and SD were large, neither made minor, and I'm not willing to go higher. For comparison, my usual load is 3.0gn of Clays with a 180 and it tested at 737 fps (133PF) with a SD of 9 and ES of 29.
I'm going to keep the TB for CAS and look for a new minor load when I run out of Clays.
-5hakey
