Chronoed the 2240 carbine today.

[45Bravo]

I have chronoed this rifle before on a 92 degree day, with the velocity adjuster in the stock adapter set at the 1/2 way point.
It was a high of 511fps, then went down, and averaged 487.

Today, I cranked it all the way in, to preload the spring to the max to see what change it would have on the velocity.

I fired it once to pierce the cartridge, then started the chrono test.


2240 carbine 10 inch barrel, with LDC.
14.3 cphp
Velo adj all the way in
93deg

36shots
Hi 543
Low 229


526
538
540
543
536
537
538
535
538
537
533
527
523
517
516
513
513
516
510
509
505
504
499
497
495
490
494
472
468
454
448
441
385
371
353
326
297
266
229

[LAalex]

Thanks for the info.  Those are pretty good numbers for such a short barrel.  That's a handy little hammer.  Any mods?

Scotty

[45Bravo]

Internally, it has a stock valve, and spring, and bolt probe, but added a poly port mod, and polished the trigger contact surfaces, and re crowned the 10 inch barrel, don't know who made the LDC, it came in a trade.
The power adjuster is built into the stock adapter.

One of the reasons I posted it was to show the FPS gain over the factory 7.5 inch barrel.

[sshewins]

Wonder what would happen if you backed it out 2 turns,  as far as the shot count is concerned.

[45Bravo]

That is my next step, while the velocity did increase, my shot count decreased(expected) but my curve is vastly different, my next outing will be backing it out 2 turns for each cartridge..

Until I am beyond the stock setting.

[sshewins]

Well whatcha waitin fer? Start chootin!!! Haha