PRB's

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01-13-2005, 01:15 PM

Nim

Spike

Thread Starter

Join Date: Oct 2004

Posts: 31

PRB's

Want to get a GM barrel in 54 to shoot prb it come in a 32" barrels with a 1/60 and a 1/70 twist which one would be better and why ? TIA Nim

01-13-2005, 01:24 PM

nchawkeye

Giant Nontypical

Join Date: Nov 2004

Posts: 5,425

RE: PRB's

One in 70...because my custom .54 has a one in 72...and it shoots better than I can!!! Most custom barrels are one in 66 for .45 and .50 and one in 72 for .54...The slower twist will allow you to shoot higher powder charges without the ball/patch stripping the groves...Good Luck

PS...I'm assuming you are getting for hunting loads (80-120 grs) in a .54..
but mine also does well with as little as 50grs ff...

01-13-2005, 02:34 PM

cayugad

Dominant Buck

Join Date: Feb 2003

Location: Wisconsin

Posts: 21,193

RE: PRB's

I have a Green Mountain with the 1-70 twist in .58 caliber and that rifle will really shoot. The thing you will discover with the slow twist and the GMB is you can load a rather stiff charge if you like and the rifle will still shoot perfect. I load 100-110 grains of FFg in mine with a patched roundball and it will shoot excellent groups even out to 100 yards...

Very few animals can take a patched roundball pushed hard. The ball flattens if it hits bone making an even bigger wound. The other thing is you are already starting with a 9/16th hole. Hit bone on a deer and it only gets bigger......