Thread: lengths of barrels

Im on phone atm googling will be to awkward so I will ask here. Whats the longest length in a .22lr barrel you can get before it starts making a bad effect on the projectile. Also same thing for a 6.5x55.

.22lr -waaaay back in my remembering I think the projectile starts slowing down after travelling 16 inches of rifling.

And a 6.5x55 -Are people still using these????????

Standard high velocity ammo 13 -14 inches some of the "newer" higher velocity ammo might be helped by an extra inch or two

Originally Posted by 7mmsaum

.22lr -waaaay back in my remembering I think the projectile starts slowing down after travelling 16 inches of rifling.

And a 6.5x55 -Are people still using these????????

I cant beleive your still on a 7mm!

Somewhere on here is a link in a thread that showes optimum length(velocity) in 22lr, cant remember what thread try searching.

Thanks guys.

Toby, i am a bit sceptical. You are not going to make a .22 out of a bit of old pipe are you?

Nope. Just thinking about it.

When Anschutz introduced their 2013 target rifle they settled on 17.75" with the rest of the "barrel" just being a bloop tube. That is with target velocity ammo though. Anschutz probably know what they are doing. I had an article by a Yank somewhere where he progressively chopped of bits of a 22 barrel with hacksaw, did a very rough crown and tested. Kept cutting until velocity peeked and then started to reduce. Stopped at that point. I cannot remember the exact length but around 15-16" rings a bell. On some of the Yank forums they are also saying around 10.5". Maybe you could do the same experiment with your best 22?

12" 10/22 gave same speed as 18"

One I shortened recently to 12" following Gimps comment above and it made no difference to the gun at all. Except its wicked to shoot now and light as ....

What about accuracy? I just measured 2 of mine 16 and 21 they had no differnce in speed. I know my single shot has a longer barrel then 21" so next time I get the chorny around here I will check it out

Originally Posted by Toby

What about accuracy? I just measured 2 of mine 16 and 21 they had no differnce in speed. I know my single shot has a longer barrel then 21" so next time I get the chorny around here I will check it out

No difference at all. Still pop starlings and Mynas easy as at 50 mtrs with subs same as before. My subs fall off after that anyway and always seem to have done that so I use .17 HMR for everything further than that.

Thanks for that. I want a longer barrel for my gun cause I thought it may increase accuracy over 50m. One more thing I was reading in some forum full of americans they said below 12" may be shorter cant remember precisley but that even HV ammo will only be subs. Is this true?

Originally Posted by Toby

What about accuracy? I just measured 2 of mine 16 and 21 they had no differnce in speed. I know my single shot has a longer barrel then 21" so next time I get the chorny around here I will check it out

In theory a shorter barrel should be more accurate.
Be careful when reading on accuracy with shortened barrels as some miss informed refer to accuracy loss with shortened barrels but what they are describing is bullet drop which has nothing to do with accuracy.


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