A couple of barrel questions

goose

Well-Known Member
Joined
Dec 26, 2008
Messages
190
Are there any formulas or rules of thumb for how much velocity is gained or lost per inch of barrel length? I'm mainly concerned with 22-30" lengths. Do different cartridges or calibers respond the same assuming hunting weight bullets and "normal" velocities.

My other question is does powder burning rate have anything to do with barrel life? I assume long bullets would cause more wear, is that right?
 

LouBoyd

Well-Known Member
Joined
Oct 15, 2007
Messages
770
Location
Patagonia Mountains, Arizona
Are there any formulas or rules of thumb for how much velocity is gained or lost per inch of barrel length? I'm mainly concerned with 22-30" lengths. Do different cartridges or calibers respond the same assuming hunting weight bullets and "normal" velocities.

My other question is does powder burning rate have anything to do with barrel life? I assume long bullets would cause more wear, is that right?
There are too many variables to have a simple rule of thumb for velocity vs barrel length. An interior ballistics program like Quickload will do a pretty good job of predicting velocity for a given barrel length, bore, case capacity, powder, bullet weight, and bullet material. It even accounts for bore friction, The simplest rule is that for a given bore diameter the larger the case capacity the longer the barrel needed to use the cartridge efficiently, but not everyone wants to use cartridges efficiently.

Bullet friction is generally negligible in determining barrel life. Barrel damage is caused primarily by the high temperate of the propellant gases removing metal in the throat o the gun. A heaver bullet may cause more time of exposure of the barrel to the high temperature gas, but it would do about the same if it was frictionless. You could get a lot of barrel wear by shooting bullets nearly as hard or harder than barrel steel, but who would do that?

If you think of barrels on a gun like tires on a car you can quit worrying about barrel life even with the most radical big cartridges.
 

Trending threads

Nightforce has great tracking capabilities, they are rugged, a bunch of elevation, holds zero forever, and reticles are designed for long range shooting. So if you are looking to shoot long distances constantly, then you need a scope that can take the abuse. -- gilmillan1


Culture Of Excellence At Nightforce Optics
By Len Backus

A high level of quality both in production and in service. Read More


Nightforce is such a solid combo of reticle, available elevation, glass that is good enough to shoot at the longest range you can dial. Nightforce has bullet proof construction that can handle the incidental horse rolling or some other rodeo action. -- bigngreen


Nightforce ATACR Scope Review
By Jeff Brozovich

The new NightForce ATACR is for sure a top choice for any long range shooter. Read More


The total package. Nightforce is the best I have used as far as turret feel and solid detents. I have never had one that didn't track right on and always return to zero. Nightforce NXS is the best value for everything I need. -- Broz


Nightforce Velocity 1000 Reticle Review
By Scott Shreve

I think Nightforce knocked it outta the park with this reticle! Read More

NightForce


Top