Deeper rifling grooves?

[westrayer]

I remember seeing a post about someone having the grooves deepened slightly in a production gun. I imagine in an effort to improve accuracy?
Anyone have actual experience with this?

 

[rich pierce]

A lot of matches have been won with shallow groove production guns. Most shooters I know who want more out of their production gun get a drop-in barrel that is longer and has deeper grooves. A guy in the club I belonged to in St. Louis won a lot of matches using TC guns with Green Mountain and other drop-in barrels, 36-42” long. .

 

[Grenadier1758]

Like @rich pierce, I lost matches to the same guy.

In general, most of the top shooters in that club prefer barrels with relatively deep, square cut grooves and slow twist. The lands are polished smooth. The tightly fitting patches are lightly lubricated with a variety of lube mixtures and cut at the muzzle. Wiping between shots is also common.

 

[hanshi]

I have a fairly strong preference for deep grooves in rifle bores. My flintlocks have rifling of around .010" - .012" with square cut grooves up to radius cut grooves of about .016". There is an accurate percussion rifle in my safe with approximately .006". I'd like deeper rifling in this rifle but the accuracy with those shallow grooves is already amazing.

 

[akroguy]

Fouling retention trenches.

More loads between wipes?

 

[Grenadier1758]

Deeper grooves, better engagement of the ball and patch to the rifling.

 

[olskool]

the most important thing for accuracy is located behind the bore past the barrel, it is the shooter. there is a lot of sweet music left in a worn-out fiddle, as long as the man playing it knows how,,,,,,,,,,,,,,,,,,,,,,,,,