In .22 ?1:20-1:24 will be fine for medium weight slugs. Looking at your pictures of the rifling I'm guessing it's not very slow...but can't say for sure.
Hey JPS,Nice rifle. So if Martin built it and tuned it to shoot accurately for BR, why do you insist on mucking it up to shoot bigger, faster and heavier slug/pellets?? If you wanted a Tinker Toy, you should have bought an FX.
The truth is ... YES they can be made to work / perform better than they come from the manufacturer. Now granted very few know or understand what those changes may be ? but those who do continue to change stuff for the betterment of the platformHey JPS,
Some of us just can't keep well enough alone.
It defies logic and basic conservative thinking and assumes "WE" have the ability to make it better.
I don't know how often the "Tinkerer" gene has created a fine mess ....... but I usually find a way out .......... with the help of others.
We're lucky here ... a few of our members (Motorhead/ect..) share their wisdom with the "Masses"All I know if Mike or Martin builds a gun for me, I’m not touching it!