After finding out today that Alliant Power Pro 2000 has a 1 to 2 fps variance per degree F, I asked the Alliant guys which of their other products (almost all of them) were temperature sensitive and found out some of my favorite loads will have this problem (especially for my 6.5-06 which uses temperature sensitive RL 22 and I cannot jut go buy factory ammo) - As I hunt in Colorado there can often be a 60 degree difference where I hunt and the indoor range where I chrono - It was like finding out there is no Santa Claus.
My question is this - Which way does it effect - meaning does the shot speed up or slow down as it gets colder - or is it completely random? If I can factor this in then maybe I do not have to spend a year re-working all my loads with Hodgon and IMR new generation powders. Since we could be talking 60 degrees delta on 300 yd shots I would like to know.
As I think about it - how do I know what my factory ammo will do - as they do not disclose powder - I shoot a lot of Hornady ELD X - or am I over thinking this 1000th variable in reloading - or do I need to take my chrono out in the freezing cold and shoot.
My question is this - Which way does it effect - meaning does the shot speed up or slow down as it gets colder - or is it completely random? If I can factor this in then maybe I do not have to spend a year re-working all my loads with Hodgon and IMR new generation powders. Since we could be talking 60 degrees delta on 300 yd shots I would like to know.
As I think about it - how do I know what my factory ammo will do - as they do not disclose powder - I shoot a lot of Hornady ELD X - or am I over thinking this 1000th variable in reloading - or do I need to take my chrono out in the freezing cold and shoot.