barrel length vs velocity

[swampratt]

some good reading on the subject.
I cut my .308 barrel on my 10fp with a hacksaw and crowned it my hand and accuracy with the shorter barrel is much better.

http://rifleshooter.com/2014/04/223...gth-a-man-his-chop-box-and-his-friends-rifle/

 

[zghorner]

how did you go about crowning the barrel? I am trading someone for an archangel mosin nagant and plan on cutting it downto 16"

 

[swampratt]

A friend in New Mexico sent me a Brownells 90 degree face cutter and 11 degree crown cutter that you use with the supplied T handle.

It tightened groups a little bit 1/4 moa over the hacksawed barrel that i crowned with lapping compound and a marble.

I actually cleaned up my Mossberg 100atr with the marble and it shot better groups. Before it did not like boat tails at all. after the slight chamfer it grouped them just fine.

Old school primitive stuff but it does work.

If you cut it to 16 are there any laws to worry about,, what if it was a hair under 16"

 

[zghorner]

Ill go a little long

 

[swampratt]

I took a pipe tubing cutter and snugged it around my barrel and gave it a twist and made a line.
I then removed the cutter and began hacksawing the barrel with a new hack saw blade.. the barrel to my surprise was very soft.
The softest steel i ever cut with a hacksaw.
I then took a file and filed the muzzle end very flat and then crowned it.
I cut the barrel just in front of the line the tubing cutter made.. I left the line for reference.

If you have a disc sander a table top type with a fence you can lay the barrel against the fence and square up with the disc and sand the barrel flat while turning the barrel against the fence. Keeping it square with the disc sander.

 

[CAR-AR-M16]

If you cut it to 16 are there any laws to worry about,, what if it was a hair under 16"

If it is 16.000", you are fine. If it is 15.999", it is an SBR.

 

[furlong222]

If it is 16.000", you are fine. If it is 15.999", it is an SBR.

cut it to 16 1/2...you will lose a bit when you square it up....

 

[761mph]

cut it to 16 1/2...you will lose a bit when you square it up....

what he said, because they're not going to use your tape measure

 

[Jack T.]

Ask Randy Weaver if 1/8th of an inch makes a difference to the FATF.