N565 Temp sensitivity 6.5 prc load

[whitecoyote]

The Hornady ballistic app is asking me Temp sensitivity factor, for N565 powder. I know its pretty temp stable for the most part. Does anyone have any numbers they input into their ballistic app for N565? Its going to be low 70s in the morning and high 90s from now to the end of august. Just looking for a general number i can throw in the app till we start getting into colder months.
I Finally found a load my 6.5 prc likes 156g berger, 58.6 gn n565, ADG brass, 210m primers, MV 2914 fps , 21 inch carbon barrel. single digit sd and ES.

 

[jonnyviceroy]

The Hornady ballistic app is asking me Temp sensitivity factor, for N565 powder. I know its pretty temp stable for the most part. Does anyone have any numbers they input into their ballistic app for N565? Its going to be low 70s in the morning and high 90s from now to the end of august. Just looking for a general number i can throw in the app till we start getting into colder months.
I Finally found a load my 6.5 prc likes 156g berger, 58.6 gn n565, ADG brass, 210m primers, MV 2914 fps , 21 inch carbon barrel. single digit sd and ES.

I don’t have an exact number but read in multiple places it is similar to H1000. Hornady lists h1k as .4 temp sensitivity factor. I think .5 will keep you covered and account for a large enough difference you would be able to run into any situation.

 

[whitecoyote]

I don’t have an exact number but read in multiple places it is similar to H1000. Hornady lists h1k as .4 temp sensitivity factor. I think .5 will keep you covered and account for a large enough difference you would be able to run into any situation.

Thank you! I went and shot today at 59 degrees and my velocity stayed the same as it did at 82 degrees!

 

[SloppyJ]

The best option is to input multiple values for your setup. Test it at different temps and input that info. I use AB and can do that. I imagine hornady does that too.

 

[huntnful]

It will have minimal effect on your actual data. As jonny said above, just input .4fps per degree with a baseline of 70 degrees. Should be good to go.

Also that load is freaking smoking fast for a 21" with 156's and N565

 

[whitecoyote]

The best option is to input multiple values for your setup. Test it at different temps and input that info. I use AB and can do that. I imagine hornady does that too.

I switched to AB yesterday. I definitely like the option of being able to put multiple MVs during different temps!

 

[whitecoyote]

It will have minimal effect on your actual data. As jonny said above, just input .4fps per degree with a baseline of 70 degrees. Should be good to go.

Also that load is freaking smoking fast for a 21" with 156's and N565

Yeah I was not expecting to be shooting this fast lol. Factory 147s shoot 2900 out of my gun

 

[stratofisher]

Yeah I was not expecting to be shooting this fast lol. Factory 147s shoot 2900 out of my gun

I have noticed that the 156 seems to have less bearing surface and shoots a bit faster than the 147's for comparable loads. Surprised me based on weight difference, but the Hornady is a slower bullet

 

[43.6N]

I think it’s closer to 0.2 for n555 and n565. Based on my notes from last summer.

with my lot of powder, and my humidity.
57.5gr N565:
2830fps @ 27f.
2845fps @104f

 

[eyeguy]

It will have minimal effect on your actual data. As jonny said above, just input .4fps per degree with a baseline of 70 degrees. Should be good to go.

Also that load is freaking smoking fast for a 21" with 156's and N565

I have a seekins 24 in barrel and am getting 2950 with n565 and the 156 berger so pretty well matched up vel increase and added inches.

 

[Dark timber]

Sounds like you’ve got a winner. I might have to try that combo when I run out of RL26, which I use with 147s. How’s your accuracy?

 

[Harvey_NW]

In my location of Central WA, testing from 36°F (avg 2893fps) - 88°F (avg 2933fps) my chrono data came out to .77fps/1° for 10 shot groups, and has been spot on in my AB profile on my Sig Kilo 5k. This was with acclimated ammo consisting of N565, ADG brass, 143 ELD-X, and a Rem 9½ primer.

 

[Kimber7man]

I'm thinking that 58.5 N565 and the 156 EOL, in Lapua/ADG/Hornady brass, with F210M primer, is just a load that works with just about any 6.5 PRC. It has worked in 4 rifles so far for me - short actions just load to magazine length (2.955" COAL).

 

[Treelineasassin]

I'm thinking that 58.5 N565 and the 156 EOL, in Lapua/ADG/Hornady brass, with F210M primer, is just a load that works with just about any 6.5 PRC. It has worked in 4 rifles so far for me - short actions just load to magazine length (2.955" COAL).

I can agree. The 58-59 area with n565 or H1000 has worked with the 156 eol, 140hyb, or 140eh in several rifles.