Jack Stanley
05-23-2013, 09:16 AM
Another thread reminded me of some range time I spent recently with forty-plus year old Marlin carbine and my model twenty-nine Smith and wessons .
The load was Cases by W-W , primers WLP , bullets were Remington two hundred forty grain jacketed soft points and nine point five grains of Unique . In the carbine the loads chronographed averaging 1197 feet per second and the extreme spread was less than twenty feet per second . I didn't take any special pains as to which way the powder was positioned just levered another round from the magazine .
The revolvers though was a different story and was getting two different groups of velocities . With the powder forward velocities were in a area of 980 feet per second , with the powder to the rear it was 1040 feet per second . When I was just running the gun like I did the lever gun I was getting these spreads all in the same string of recorded shots . It made me start thinking that the longer barrel of the carbine allowed the powder to burn more consistant because of the longer resistance time the barrel gave . I don't know that for a fact so just call it a theory if ya want .
Perhaps a different powder in the same range would work a little better but I have the Unique to use for now . Perhaps more of a crimp would help the handguns with the velocity spread , it would be nice to see a spread of thirty feet per second . Since my eyes are so bad with the handguns sights perhaps it doesn't matter , it's not like I'm taking long shots anyway . I can't help but think that maybe if the extreme spread was less the accuracy would be a little better . My bad eyes can direct the four inch gun to nines or better from the bench with the target and thirty yards .
I can't be the only one that has seen stuff like this I bet ..................
Jack
The load was Cases by W-W , primers WLP , bullets were Remington two hundred forty grain jacketed soft points and nine point five grains of Unique . In the carbine the loads chronographed averaging 1197 feet per second and the extreme spread was less than twenty feet per second . I didn't take any special pains as to which way the powder was positioned just levered another round from the magazine .
The revolvers though was a different story and was getting two different groups of velocities . With the powder forward velocities were in a area of 980 feet per second , with the powder to the rear it was 1040 feet per second . When I was just running the gun like I did the lever gun I was getting these spreads all in the same string of recorded shots . It made me start thinking that the longer barrel of the carbine allowed the powder to burn more consistant because of the longer resistance time the barrel gave . I don't know that for a fact so just call it a theory if ya want .
Perhaps a different powder in the same range would work a little better but I have the Unique to use for now . Perhaps more of a crimp would help the handguns with the velocity spread , it would be nice to see a spread of thirty feet per second . Since my eyes are so bad with the handguns sights perhaps it doesn't matter , it's not like I'm taking long shots anyway . I can't help but think that maybe if the extreme spread was less the accuracy would be a little better . My bad eyes can direct the four inch gun to nines or better from the bench with the target and thirty yards .
I can't be the only one that has seen stuff like this I bet ..................
Jack