Thread: believe it or not?

Originally Posted by res

Funny thing, my target rifle has a short barrel with a tube extending out past it to extend the sight radius. It's a factory anschutz set up so hardly a buba job

Rimfire?

There will be an optimum length for velocity for any given cartridge.
While i think you can get SOME speed back with faster powder in your normal big game cals your always goin to loose over factory length and optimum charge of optimum powder.

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Originally Posted by veitnamcam

Rimfire?

i think you can get SOME speed back with faster powder optimum powder.

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. The problem with verifying this is identifying max pressure with either powder. While someone may appear to get some velocity back its most likely they are just running at a higher pressure. Or didnt have the best powder to begin with

In my experience I have been able to gain some velocity back by changing to a faster powder after shortening the barrel but I have never gained it all back. Close in a couple of instances although, whether thats increased pressure or a real gain for same pressure I couldnt say.

However, the longest barrel will pretty much always win the velocity battle. Unless of course you go stupid long and friction comes into play.

Originally Posted by Proudkiwi

In my experience I have been able to gain some velocity back by changing to a faster powder after shortening the barrel but I have never gained it all back. Close in a couple of instances although, whether thats increased pressure or a real gain for same pressure I couldnt say.

However, the longest barrel will pretty much always win the velocity battle. Unless of course you go stupid long and friction comes into play.

No debate about velocity and barrel length. The longer the barrel the longer the bullet is exposed to the pressure so the longer it will keep accelerating.
the discussion is really about optimum burn rate and barrel length.

Typed a long reply but lost it

.22

But work out the energy you need and go from there. That's my short answer

I personally have never measured pressure,only projectile speed. And have kept things safe.

To me it's just about wether it works as needed,or not

Graphs please

Originally Posted by veitnamcam

Graphs please

Dammit, .....searches for the dont like button..

Ill see if I can pull one off QL

So, the point of the thread is......?I am easily confused

I have a 700 Rem tac (or it started out that way once upon a time), 20" barrel, just for shots and giggles, at the range friday arvo gone, loaded up some 165 SST's, got them doing 2980 average at the point I was blowing the primers clean out.Was shooting half inch doing it too!(certain precautions had been taken by the way)

Clearly not recommended, but, that is faster than factory? yes?. Got there using a really fast powder, so, fast powder and stiff load, and the bullet goes faster. There is a point at which a barrel is too short, but you can get velocity back if you are prepared to raise pressure, safe or not.

Everyone likes graphs.

Originally Posted by veitnamcam

Everyone likes graphs.

Not pro 1080 people opps thats Grafs

Hopefully below is a chamber pressure graph for a 7mmsaum . All things being equal if a faster powder was used the curve would be more of a spike and the area under curve would decrease

Originally Posted by sneeze

Hopefully below is a chamber pressure graph for a 7mmsaum . All things being equal if a faster powder was used the curve would be more of a spike and the area under curve would decrease

Attachment 23922

Would be interesting to compare quick load to strain gauge graphs.
Especially in a few different rifles.

Originally Posted by veitnamcam

Would be interesting to compare quick load to strain gauge graphs.
Especially in a few different rifles.

There would be some differences no doubt. I find the QL outputs very close with most Iv tried but way out on a few. I dont think it would change the basics though.

Yikes!

yep each to their own........was that a 1 pound or 6 pound hammer to open the bolt?