Jump to content

Crane carbine vs midlength test results

Recommended Posts



So in Crane's testing of the URG-I vs M4A1, the numbers make sense except for this one. Maybe you ballistic gurus can answer this because I have no idea.






How can you have 2 significantly different mean muzzle velocities at 100 yards when they both started off with nearly the same muzzle velocity, out of the same length barrels with the same twist rate? It cant be stability since that is based on starting velocity and twist rate.  Is there some kind of magic that the midlength gas system imparts on the bullet that causes it to have less velocity decay or is this just a statistical artifact? 


Link to comment
Share on other sites

On 5/15/2018 at 2:42 PM, Collimatrix said:

How many barrels total were tested?  Barrels of the same caliber and length will often show consistent muzzle velocity differences of tens of feet per second for no apparent reason.

Don't know.  The 2018 presentations haven't been posted on DTIC's webpage yet.

When they go up, it will probably be at this link:


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...