I certainly respect that decisions you have made as a business, and agree we can all do little things to help. I have even used your product in a couple of rifles I have
. I appreciate the dialogue, and am certainly not trying to challenge you or the conversation you had, but I still would be interested to know if it is possible to rule out other things.
If there is a seasonal rise there could be other environmental factors outside of hunting. Does the chemical composition of the water change seasonally? In the spring there is snow runoff which could dilute metal content naturally in the water, in the later part of the year it may be more concentrated as it is direct from the aquifer. Does the diet of the prey change? you already eluded to this, and we all know the eating habits change seasonally for may animals. This goes through the whole food chain. Deer and elk are rutting so they are more strained and the diet changes, animals are preparing for hibernation and their food sources may be different in the fall than in the spring when they exit hibernation. I wonder if the seasonal aspect of the entirety of the food chain compounds and affects scavengers more.
Again, not challenging this, but there may be other environmental factors. Even in birds, spring is nesting time (typically) and their day to day habits are different in the spring rather than the fall. Some predatory birds may fish more in one time of the year, and scavenge in another.
To me there are a lot of variable to place this solely on bullets or lead shot. I imagine these are some portion of the contributing factor, but at what percentage may be very hard to pinpoint.