Here is another .62 cal rifled rifle. That almost sounds redundant. Better file that at the department of Redundancy Department. Oh, stop it!!
The rifling is one turn in 104 inches. 8 Lands and Grooves, about .008" deep. The grooves are about twice as wide as the lands.
My target load was 135 grains of Ffg powder for "plinking" and 200 for more serious intentions. Above 150 grains the patch would burn out as a result of the powder burn, so I started using lubed 20 gauge Cushion Wads from Blue and Gray (Ox Yoke). That pretty much solved the problem. I found that it would wipe and lubricate the bore, it would seal the barrel so the patches wouldn't get flame cut and it did increase velocity several fps.
By the way, with a full charge and shooting over a chronograph, with the Ffg powder I was getting about 1995 fps. Pyrodex Select RS gave me about 2005 fps.
When I shot more reasonable loads, say under 150 grains, there was never a problem with flame cut patches. When I say flame cut, I mean they looked more like charcloth. With the cushion wads, I dare say one could pick up the patch off the ground and use it again.
Guess that's about all.
John