Can anyone tell me from experience if 2225 powder is temp sensitive? I have been using 2217 for most my rifles but would like the velocity gain.
Cheers
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Can anyone tell me from experience if 2225 powder is temp sensitive? I have been using 2217 for most my rifles but would like the velocity gain.
Cheers
H1000/2217 is more temp stable than 2225.
2225 in my 7 mm rem mag had 5 inches of vertical difference in group centres at 1000 yrds from cold ammo to hot ammo.
If you need the extra velocity that 2225 can give, and you still have the accuracy you desire at that extra velocity, then store your 2225 powered ammo in your pocket, this averages its temp and your poi.
Now i just use 73 grains of 2217.
Cheers saum I thought that was the case
I haven't done any tests between the two of them myself.
Every cartridge & primer combination will be different.
We generally don't have the temperature variations here that other countries do.
2225 will provide more velocity than 2217 & is way more stable than say US869.
Have a look at this test done in Aussie.
Rifle powder temperature sensetivity
You should probably do some tests & see if the powder is suitable for your requirements.
If you do please let me, I would be very interested along with many others :)
Yes 2217 is the leader when it comes to temp, thats why the Yanks like it so much as they can be shooting in very hot weather one hunt and bellow freezing level the next.
But 2225 isn't to bad either and in the north island where we don't get mad temp swings can be very useful in a 338 edge giving a little velocity increase, should you try 2225 if it was me I would give it a try and post up your findings I'm sure they will be glowing;)
Actually I wouldnt agree (depending on where in NZ you are) on that as NZ's sun gain at 41 south latitude v air temperature can make a huge difference. Parts of NZ (wellington for instance) is the perfect place to use passive cooling techniques in buildings as we have a high solar gain but a low air temperature in comparison. Even placing a round at outside air temp in a hot chamber can make a difference.Quote:
Originally Posted by Kiwi Greg
Now you have mentioned it Iit reminds me to test my new thermometer on rounds in and out of the sun to see what the difference is. I will also try and get a temp on a barrel on Saturday after 12rounds of 308.
regards
Quote:
Originally Posted by steven
I know where you are coming from but when was the last time it was 45+ & -30 here like it can be in the States ?
Looks like I will be buying some 2225 and dusting off the chrony
Do it :)Quote:
Originally Posted by 338
You know you want too :)Quote:
Originally Posted by 338
The temp difference doesnt have to be that great. Some of the pieces Ive read suggest that the slighltly higher velocities offered by some powders is more than offset by their temperature sensitivity in long range shooting. Not to mention increased barrel wear. So 20deg C air and 45Deg C sun / temp of the bullet is noticable, even taking a 20Deg C bullet and inserting it in a hot barrel is enough. Now I have not tested this myself yet I admit but enough palma/ftr ppl have said or written this for me to take heed and stick to ADI 2208/varget for what I do.Quote:
Originally Posted by Kiwi Greg
So the Q is is 2225 giving you something you just cant do without?
Yes but this is thread is about 2225 & 2217 in an Edge in this case.Quote:
Originally Posted by steven
Did you read this link ?
Rifle powder temperature sensetivity
Didn't seem to bad to me ??
If all goes to plan I will have answers by tomorrow night.
Nit implying this is your problem 338 but from my findings the below is where it starts!Quote:
Originally Posted by 338
Dare I say it but powder really shows its temp sensitivity at high pressure!
Dropping your load back below max things often settle down alot!! A hell of alot!
2225 goes very well in an edge as long as you keep your load at good safe working pressures!
IMHO
94gns is a good safe 2225 load to sit on !!("workup") it can and will shoot up as far as 96 or even 97 but its teetering on an "EDGE" of brass life an pressure spikes!
I still have a pile of ruined brass from a pet load givin to me sitting in a box from 2225!
94gn N570 is a fantastic load for an edge well below max and 40fps up on 2225 at any stage of matching pressure signs!
I would be keen on hearing results on taking temperarure of cases in various situations but then pulling the projectile and taking temperature of powder as well. Im curious about how much the temp of the powder itself changes. From that you could then work out a formula for powder temp.based on case temp and have something more definitive. All chronyed through cold barrel of course to keep things equal. Dont want barrel/chamber temp and associated effects swaying thingsQuote:
Originally Posted by 338
You dont want much :)Quote:
Originally Posted by horihunter
Not a fan of subjective conclusions :thumbsup:Quote:
Originally Posted by 7mmsaum
Today I loaded up 6 rounds consisting of 93grains of 2225, remington brass, federal magnum match primer and a berger otm 300gr for my edge.
3 rounds I sealed up and sat on ice for half a hour (colder than they would ever get in hawkesbay) and the other 3 I put in my pocket with the snap disk type hand warmers (hotter than what the Hawkesbay summers would be able to get them)
The barrel was left to cool after each shot.
The results were very interesting!
COLD loads measured 2803, 2785, 2770
HOT loads measured 2748, 2744, 2750
I was almost doubting my chrony because I had always thought the hotter the powder the higher the pressures? But this data was backed up by both the impact point at 340yards being 1.5" different between groups and the obvious pressure signs on the cold cases!
A outcome I was not expecting but I was still pleased to see that if I set my velocity for my balistics chart to 2767 fps that will give me 20 fps variation either way at the VERY most which is only going to throw me 4" at 1000yards but even then if I keep the bullets in my pocket when I hunt and sight in etc it will close it down to more like 2" due to the reasonably constant temp of a pocket.
I will add that both groups at 340yards were well under 2":thumbsup:
Good interesting result id say in normal working temps there would be bugga all difference!!! But crank that load up to max and will be different story ;)
Just for interest was the group you fired in the weekend at 1065yds with 2217 or 2225?
92.5 grains of 2225