Why you should always watch for presure signs.

[Catfish]

I shot out the barrel on my .22-6mm and took it up today to have the barrel cut back and rechambered. The chamber was cut with the same reamer so I was able to load the ammo that had been fire formed in the old chamber. I thought I had it made untill I fired a couple of rounds. The ammo was loaded at max., but it was loaded to max. in high 80 degree temps. and now it`s alittle to hot in cold weather.      Why this is I`ll never know, but I`m glad I tried the old ammo in cold weather instead of hot.  I guess I`ll pull the bullets and reload my ammo.

[Nobade]

Yep, that fresh new throat lets it build more pressure than the old worn out one. Good advice for folks to remember.

[briannmilewis]

Now I understand why bench rest competitors load ammo at their events and load it differently whether it is in the morning or afternoon based on temperature...

[LONGTOM]

It's a good thing you tested and found out about it now.
If it is a to hot load in the cooler temps just think what pressures it will reach in the heat of summer!   

That is also a good reason not to let your near max ammo ever lay in the sun or on your dash in a vehicle.
A BIG NO NO!!!



LONGTOM

[briannmilewis]

So does that mean that if I load to medium pressures I should not be worried about temperature changes?

[Sweetwater]

No, it means, 'keep it cool' and stay alert.

[briannmilewis]

No, it means, 'keep it cool' and stay alert.

Got it. Does that mean I should carry my factory or reload ammo in a cooler with a plastic ice brick on the bottom separated from the ammo when I go to the range regardless of the temp?

[leather5to1]

What kind of velocities do you get out of that chambering?

[Nobade]

Around here (Albuquerque) folks will keep ammo in the cooler in the summer and get it out right before firing. Not iced, but ammo in the sun will get hot enough that you can't touch it. Depending on a lot of variables, it really makes a difference. Hot ammo, even if it's not pushing dangerous pressures, will not hit to your zeros. In the winter, who cares? Everything is cold so it doesn't really matter. Your winter zeros are different from your summer ones though...

[briannmilewis]

I haven't been doing this centerfire thing long enough to know that. Thanks...

[Catfish]

brainnmilewis, You have not. That`s one reason I like forams like this and this one especially. I started loading my own in 1965 and still pick-up things around here, FREQUENTLY, that I put to use. One thing I like is that GB doesn`t want post for loading data. I was on another site acouple years back and found a load that someone had posted. The load was for a rifle and he had mistakenly put the wrong powder, a handgun powder, number in the post. I spotted it right away andposted not to even think of the load as it would blow-up any gun it was fired in, and the guy came back on with in acouple of hrs. and corrected his load and appoligized. The problem would have been if I had not caught it how long would it have been there and if someone had yried it.

[briannmilewis]

As often as it is repeated, there is something really different about GBO folks who come and stay...there is a consideration for newbie to veteran, and nobody gets uppity no matter how dumb some of my and other questions might be. It is place I go every day, and there is no other sites I do that with that are content and interactive based. It is like a bunch of friends that just happen to live all over and we are happy to see posts from folks we have never met, but think we know them at least a little from their posts. Brian

[Catfish]

Leather5to1, Sorry I missed your post the last time I was on. There are acouple of powders that I have ran 3,500 fps and alittle with. With a 26 in. barrel it looks like that is about tops and most powders are not safe at those velocities. At anything over abt. 3,100 fps. the Sierra 80 gr. MK sure makes a great varmint bullet though.