Comments on: TECH TIP: Velocity Increase In New Gun Barrels

By: G7BC

G7BC — Fri, 07 Aug 2020 04:01:18 +0000

Why are there always pissing contests in the comment sections below gun stories ?

By: MH

MH — Fri, 29 Jun 2018 14:18:47 +0000

OK TH… if Jim See said it… I MUST be wrong ~

40 years of long range shooting, 10 years in aerospace engineering and 18 years in Scientific Research and Experimental Development and I suppose… if you say so… I must not know what I’m talking about.

That’s sarcasm BTW.

LOL

By: TH

TH — Thu, 28 Jun 2018 21:51:26 +0000

MH I think your theory is hog wash. Jim See said in a podcast after the speed up he cleans all the carbon and copper out. His speeds are still higher. So it must not have anything to do with copper on copper making it speed up LOL.

By: lloyd myers

lloyd myers — Thu, 28 Jun 2018 19:00:02 +0000

As Speedy said Everything gets rounded up
The bullet fits (seals) the bore better

By: MH

MH — Thu, 28 Jun 2018 18:12:32 +0000

I thought I maybe should explain a little better…

As you shoot the first round in a clean barrel there is no copper anywhere in the rifling so the bullet drags against the steel. But… as you shoot more and more rounds, you get more and more copper fouling in the rifling and bullets start flying faster and faster… to a point.

Eventually accuracy goes south and you need to remove the copper and start the cycle all over again.

By: MH

MH — Thu, 28 Jun 2018 18:09:10 +0000

I think barrels speed up because the coefficient of friction between the copper bullet and copper fouling is slicker than copper bullet to the steel barrel.

I’ve noticed this mostly in the first few rounds out of a thoroughly cleaned barrel.

This is also why F Class shooter want a blow off period at the start of a match.

If you need to rifle to shoot accurately after a cleaning, then don’t clean the coper out too well, just focus on carbon.