I have to get this book someday.
I have a digital copy but do I not like computer reading.
Some tiem ago I tryed to get used of this old metod of mean distance from Walsh books but it is very confusing as two very different groups may have the same mean distance.:C

I have edited my post, distance was 50 meters (55 Yds).
Looking at those olds draws my groups looks much better. LOL

We have talk about this gun Daryl.
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=152129&an=0&page=0#Post152129

I have pass a .715" ball through the choke and get it measured by an expert.
It is not perfeclty round with 17,60mm being the lower measurement, that is .6929".
I do not remeber the max but was something like .697" so a .690" ball sould be Ok.

I have no tools for reloading 12 Ga but i have a friend that have it.
I hope I will be back to the range next week end with some RB to shot.

Thanks
Martin

PS: Ooops forgot to show the gun.