Over gassing or under gassing?

[98Z5V]

1 hour ago, Tacky said:

I do not personally own a lr308 308win sbr, my reason, I have no use for one, it does not make effective use of the powder and you lose to much velocity, and tend to blind yourself with the muzzle flash.

By the way, this is all bullschit and speculation on your part, not based on ANY personal experience.  But I get it - you read it somewhere on the .www, so it MUST be true...

Welcome to facts.  Please settle in here, and contribute what you know...

When you start spreadin' bullschit, we can smell it a mile away.

Edited December 5, 2016 by 98Z5V

[mrmackc]

There are some things common to the Winchester.243 and the Winchester .308 but after you get away from the cartridge case physical dimensions at the shoulder you are on two different planets.  Not much is noticed with a bolt action or the other manually operated breach opening and closure firearm.

Now the world of difference starts when you try to equate cloning a D.I.  .243 upper with a. .308 upper.  Most builders like us get there by trial and error. 

That works because of experience.  I would like to point out some oblivious physical differences,  the bore of the.243 is about  62% the volume of the same length .308.  With a simular volume cartridge case.  This means that the gases generated by the.243 move faster down to the gas port. If you extrapolate that out the gas reaches your gas key at least in 62% less time than a .308. Now how you handle that situation is taken care of by folks like our gas gun gurus. Fortunately if you listen carefully you can work out these problems without using a shitpot full of gathered data on a fancy computer and a lot of applied physics. PAY ATTENTION !

 

Edited December 5, 2016 by mrmackc

[shepp]

11 hours ago, mrmackc said:

There are some things common to the Winchester.243 and the Winchester .308 but after you get away from the cartridge case physical dimensions at the shoulder you are on two different planets.  Not much is noticed with a bolt action or the other manually operated breach opening and closure firearm.

Now the world of difference starts when you try to equate cloning a D.I.  .243 upper with a. .308 upper.  Most builders like us get there by trial and error. 

That works because of experience.  I would like to point out some oblivious physical differences,  the bore of the.243 is about  62% the volume of the same length .308.  With a simular volume cartridge case.  This means that the gases generated by the.243 move faster down to the gas port. If you extrapolate that out the gas reaches your gas key at least in 62% less time than a .308. Now how you handle that situation is taken care of by folks like our gas gun gurus. Fortunately if you listen carefully you can work out these problems without using a shitpot full of gathered data on a fancy computer and a lot of applied physics. PAY ATTENTION !

 

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[blue109]

Nice collection though! Those might take up a good portion of one of 98s safes!