Thanks Hap.

So do West Coast shooters notice any measureable difference shooting at venues say at Sparta or Florida? Vice Versa?

it all boils down to the altitude your shells were assembled in. Shells from out west perform better at lower elevations, very much like taking a runner to train in the mountains and then having them run at sea level..............forgive me misses are in feet not inches so what does it matter? pattern density is a roll of the dice if it is too open did you miss or the bird fly through unharmed? choke so you know.

Trap2: My son in law asked to read Frank's book years ago and now that I think of it, I never got it back. I now recall that's exactly what he said. Steve

When I shot in Mexico at over 5000 feet my American shells where like shooting a rifle at the board. Changed to Mexican made shells and the pattern went back to normal. Ken

I am such a good and precise shot with a shotgun that I must change chokes numerous times on the line to account for the effects on the pattern during momentary changes in relative humidity, moon phase (tides) and gravitational fluctuations, solar flares, barometric pressure, quantum charge on the surface of the spinning target, and of course the atomic resonance of the barrel steel during firing.

My recommendation is to calibrate the chokes to true north rather than magnetic north to more accurately account for east/west variability. Otherwise you may miss far more targets than usual if you just switched chokes to account for air density vs longitude.

I shoot alone alot though...can't figure out why.

I haven't got a chance

MX. I have found that magnetic north worked better for me if I was in northern Cal. and in southern Cal. true worked the best. So I am thinking the closer you are to the north pole you need to correct more. I wonder if you are south of the equator if you should use just the opposite chokes. Like IC instead of full and so on. I am from Wi too and found that when we have a high tide in Lake Michigan I need to go down one choke. I also use a slower shell when the moon is full. I'll shoot with you.

Just flush the toilet, and if the water spins clockwise change to a tighter choke.....never mind I was thinking north to south.....

I think your proximity to magnetic north would effect the pattern only if you were using steel shot.

So if you go to Australia you need to get some left handed primers, right?

HM

Moved West 30 years ago from Wisconsin-went back to shoot the Wisc State shoot last year.The only big changes I could tell were the black rimmed targets which we never see in the west(takes some getting used to) and the high humity which I thought makes it tougher to shoot.

As far as equipment/loads ect- it's all BS!, see the target, break the target and I always shoot 7 1/2's for everything- it does not matter.