460 Rowland: compensated vs. non-comp.

[Widder, SASS #59054]

This WAS NOT a scientific test but I found the results very interesting while chronographing a 5" compensated 1911 vs. a 6" NON-comp

1911.   Both were .460 Rowland modified pistols.

 

All ammo was reloaded 460 Rowland, 185 Nosler HP, 12.4 grains of Power Pistol.   OAL= approx 1.232" (Edited to correct OAL)

 

In firing 14 rounds thru a 6" non-compensated barrel, average velocity was 1402 fps.

 

In firing 14 rounds thru a 5" compensated barrel, average velocity was 1435 fps.

 

I chronographed these rounds in separate groups of 7 rounds (7 in the comp, 7 in the Non-comp, back to 7 in the comp, and then 7 in the Non-comp)

 

Results were consistent.  

 

I surely ain't a ballistics experts nor do I know A LOT about what I think happened.   BUT, it appears the 5" compensated barrel managed

a good 33 FPS greater average velocity than the longer 6" barrel.

 

question:  is this possible because the compensated barrel action remained closed a milisecond longer than the Non-comp barrel

action and was able to achieve higher velocities?

 

What do some of you more learned folks say?

 

Thanks

 

..........Widder

 

[Michigan Slim]

I'd venture to guess that one barrel is not the EXACT ID as the other, allowing for less friction.

[Colorado Coffinmaker]

 

Magic, Simple Magic. 

[bgavin]

Asking for a friend... is a compensated barrel one you have to pay extra to shoot?

[Larsen E. Pettifogger, SASS #32933]

I'm still trying to figure out how you got a round with an OAL of 2.232" into a 1911.

[Widder, SASS #59054]

Larsen,

Thanks for catching that typo.   I will correct it.

 

I can do a lot of things with some guns, but I can't do that with a 1911.

 

 

..........Widder

 

[Widder, SASS #59054]

7 hours ago, bgavin said:

Asking for a friend... is a compensated barrel one you have to pay extra to shoot?

 

Thats pretty quick thinking B.

Hows that DW coming along?

 

..........Widder

 

[bgavin]

Still kickin' tires... but I see gun.deals now has a whole passel of vendors all selling them at $1799, but they are in stock now, and available again.
Factor in shipping, FFL, background check, sales tax and a long waiting period... I'm not real serious, not at all.
It's a gee-whiz wouldn't that be nice to have... sorta thing.

However, I ordered the vinyl for the kitchen floor, engaged the installer, and started the ball rolling with the cabinet maker, so that will prevent any burning holes in my pockets.