I believe (just my opinion) patterning a shotgun is the kiss of death. You can tell by how hard you break extreme angles from posts 1 & 5 by shooting your gun. I bought 1 BT-99 years ago from Umburger Stocks at the Grand (in Vandalia); fired 1 round tryout round with it and bought it. That was 20 years ago and still using it today. Never patterned it. I've seen guys go to the pattern board frequently and are the most confused as to where the gun actually shoots and have repeated this process with the same gun for years. If you're going to do that, I believe better to go to the rifle range, mark of 32 & 40 yds. and shoot 10 at each target from resting the gun on sand bags with using a high target stand; you'll see a concentration of pellets and by taking 10 shots the sampling will be more accurate. Just my opinion. BT100dc
Excellent video of how to do it, EFO! Putting a bead on the target does nothing for the the fitting of a shotgun shooter, on a pattern board. If the gun fits, there really is no reason to ever look at the bead, even when "Patterning" a shotgun.
For EACH and EVERY DISTANCE and choke the pattern will change. It, the pattern will tell you almost exactly where the heaviest concentration of pellets are. Only lunatics, me, will do this at each distance will also change chokes and paper for each shot. This is good info to have IMO. Lee
Most of the shooters I know pattern their guns by just shooting them and trying different chokes. I don't know if this the right or wrong way, it just is. I patterned my adjustable rib for poi at 35 yards using a board and paper. Bill
I think patterning a shotgun is a hold over from rifle scope zeroing. The best (most informative) rifle shooting is done from a bench rest with the fixed rifle firmly supported to negate movement.
But seemingly all shotgun experts say to hold the shotgun in a standing position WITHOUT any fixed support when patterning. (?) Whether done at 3 feet or 30 yards, what value is there if the shotgun is NOT stable and free to move when the trigger is pulled? Are we testing the gun or the shooter?
I think the shooter should be taken out of the picture when testing the gun.
I also question whether the the shot spread can be extrapolated from one distance to another. That assumes the shot spread rate is a constant, straight line. Is it?