This probably should be written up as a Range Report, but its not much of one.
In the interest of calibrating the new (old) LilGun against the last of my old (newer) LilGun, I loaded 5 rounds of 250gr FTX in three 1gr increments, starting lower than my typical 38gr and working up.
Here's the chart of old vs new in terms of velocity and SD. Experience has taught us long ago, not to put much stock in the SD as its not unusual for it to run high in this caliber until you're really hitting it hard.
Interestingly, when shot as one group, the results defied the velocity differences as some slower rounds went higher than some faster ones up to the 38gr load, which has historically been an accurate load with the 250 FTX and taper crimp for me. The barrel did start out at ambient air temperature and not allowed to cool much through the 15 shots which took about a half hour to execute. When 'I was done, the barrel was hot but not alarmingly so.
Here's the three 100yd groups. Grid is half inch:
The 11 year N.O.S. Lil Gun averaged a little faster than the last of my 2 year old Lil Gun which has been back and forth from the dispenser hopper to the bottle many times, though stored in a cool, average humidity environment. I can live with the variation as just a batch variation as I've seen similar spreads from one 1lb bottle to the next over the past four years.
Time to move on. I don't know if you've followed my Trident barrel thread in the AR15 Style Rifles sub-forum, but the CrMo, Trident barrel has been averaging slightly faster velocities for the same recipes than I shot from my old chrome lined bushmaster barrel. In my old barrel, 38gr of Lil Gun pushing a 250 FTX ran about 50fps slower. May be because the chrome lined barrel offered slightly less resistance to bullet travel down the bore, but I can't say exactly why. Its a gift horse.
EDIT: In case anyone is interested in knowing, the COL distance to lands in my Trident barrel for the 250 FTX is 2.448 inches. Loaded at 2.26 COL, that equates to a .188 inch jump. In my original Bushmaster barrel that D-T-L for the 250 FTX was 2.41 inches.
H-