CAUTION: The following post includes loading data beyond or not covered by currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assumes any liability for any damage or injury resulting from the use of this information.
My velocities for M-193 from a 16" chrome lined barrel in 2013 were
FPS
3031
3052
3040
3052
3046
AVG 3043
ES 21.40
SD 8.18
That is not what I remembered and glad I did not guess a few post back based on my memory . I would have said 3150-ish
Same trip I did 62gr Green tip rounds 5 shots
AVG- 2971
ES- 43.04
SD- 15.90
I have 2 pet loads using H-335 and 55gr FMJ-BT bullets .
25gr using Hornady's 55gr bullet @ an AVG of 2936fps
25.5gr using Winchesters 55gr FMJ-BT bullet @ an AVG of 3006fps
Interesting enough I have that same data but using magnum primers instead of standard primers
25gr AVG 2891fps
25.5gr AVG 2988fps
The magnum primers had terrible ES/SD's , the worst was 25gr with a ES 100fps SD 41fps
I can't find my other data , I know I went to 26.5gr of H-335 at somewhere over 3100fps but can't find that data . I know I did because these are the cases I loaded and took the picture to show how all the primers look fine even though the cases on the right were loaded to 26.5gr at over 3100fps .
I remember because of the velocities I was getting and yet not seeing the flat primers I'd expect at those pressures . However by then I had been sizing my cases with minimal shoulder set back and I think that may have something to do with my primers not getting as flat as expected . Thinking they were not backing out and mushrooming like they might with a few more thousandths of head clearance ( for lack of a better term
) you'd get with factory sized cases . Those cases above were sized specifically for that rifle/chamber .
Example : here are what factory M-193 primers look like fired from the same rifle . A tad more flat but not to bad .
Anyways I'll keep looking for those other numbers so I can have the specifics for you guys . I must of put them in another binder for what ever reason , now it's just finding the right one .
EDIT : Just found data on a Federal 55gr factory round . My notes don't say what specific Federal ammo it is or what firearm I used . I only have AR's in 223/5.56 but don't know which one for sure but think it's my 20" NM rifle based on the velocities . 6 shot AVG was 3264fps ES-47 SD-18