cold weather chrono

[mildot1]

It is 22deg's here right now. I will be testing some loads in the next few days, 9X23 with auto comp.

I will be setting everything up in the heated garage (IE:chrono, table, rest) and raising the door to shoot.

My question is this.

If I have my ammo warmed to 85degs, will this duplicate what it would run at a true 85deg ambient temp.

I don't want to waste a bunch of components testing for useless info.

Thanks

Mildot

[G-ManBart]

I don't know whether AutoComp is neutral, positive or negative temerature sensitve, but it won't be useless data regardless. The temp of the ammo is certainly a factor, but so is the temp of the gun. I'd say it'll be enough to give you a good idea, but you'll still have to re-chrono in warmer weather, and ideally in a bunch of different conditions. The good thing if you test the ammo at ambient temp is it will be a very good data point on the extreme. Run a couple of 20-round strings and you'll have solid numbers. Then you can compare when it's 30-40* warmer and 50-60* warmer and you will know, for certain, how that powder runs in your gun over varying conditions.

I'd run a bunch with the ammo both at ambient temp and heated to whatever your normal house room temp is and see what you get. Just don't fall into the trap of doing an 8-10 round string and think that it means anything. Most folks seem to chrono about a fifth as many rounds as they really should, and then they wonder why they go Minor, or worse. I haven't seen a significant benefit of more than two or three 20-round strings, but that is way, way, way more accurate than one short 8-10 round string that so many folks do (if that). R,

[sirveyr]

I will be setting everything up in the heated garage (IE:chrono, table, rest) and raising the door to shoot.

This would surely piss off my neighbors if I were to try this. Maybe they would quit parking in front of my driveway...

[Pat Miles]

I have one neighbor that would probably come over to help and one old biddy that would probably have a heart attack. Hmmmm.

CYa,

Pat

[AriM]

it has been my experience, that temp has massive effects on loads....more and more i believe this is due to a combination of metal expansion/contraction, but even more so moisture in the load and how temperature changes that density....when it's cold my loads always seems to be a bit different....but maybe that's just me....I have no scientific way to measure the internal moisture level of a load, while keeping it intact and varying moisture/temperature....but I would sure like to know....anyone else want to chime in on that theory of mine?....oops I am hi-jacking by asking that....I will start a new thread...

[mildot1]

Thats excactly why we bought the place.

NO NEIGHBORS to deal with!!!!!!!!!