Maximum load for 7mm Rem Mag 160 gr Nosler Accubond

[Muir]

Do not forget that SA is a lot hotter than the UK and the heat may well increase the pressure on
Your reloads and affect there reliability .
Bob

True that. I have prairiedogs shooters that work up loads for winter coyote and then pierce primers using the same load in the heat of summer.~Muir

 

[Yorkie]

True that. I have prairiedogs shooters that work up loads for winter coyote and then pierce primers using the same load in the heat of summer.~Muir

Hi Muir.
Is N165 a 'Temperature Stable' Powders? It is single base but that may be over simplifying how it is achieved.

As a Man that Shoots in extreme spreads of Temperature do you find the so called 'Temperature stable' Powders are indeed so?

Thanks.

Yorkie.

 

[Yorric]

Aside from temperature the altitude alone can make a big difference to starting pressures.
Not sure where you're going but the majority of SA is above 1000m which can do funny stuff.

With respect Milligan, please do not confuse air temperature with air pressure.

Altitude makes a difference to external ballistics. - Because the air is thinner (lower air pressure) it offers less resistance to that flying bullet.
Altitude makes miniscule (read almost unmeasurable) difference to internal ballistics & "starting pressures" (whatever that means- I assume you mean breech pressure).(1000 ft increase in altitude will result in a couple of % decrease in air pressure - about 0.2 psi - chamber pressures reach 60000 psi - the ratio of the two should indicate something to you!)

Powder temperature at ignition however does affect both internal & external ballistics. Hot powder definitely causes higher breech pressures which changes muzzle velocity.

Temperature reduces with altitude as does pressure.

Bullets do have a flatter trajectory at higher altitude. - Breech pressures & muzzle velocity remains the same as long as the temperature doesn't change.

Ian

 

[Milligan]

With respect Milligan, please do not confuse air temperature with air pressure.

Altitude makes a difference to external ballistics. - Because the air is thinner (lower air pressure) it offers less resistance to that flying bullet.
Altitude makes miniscule (read almost unmeasurable) difference to internal ballistics & "starting pressures" (whatever that means- I assume you mean breech pressure).(1000 ft increase in altitude will result in a couple of % decrease in air pressure - about 0.2 psi - chamber pressures reach 60000 psi - the ratio of the two should indicate something to you!)

Powder temperature at ignition however does affect both internal & external ballistics. Hot powder definitely causes higher breech pressures which changes muzzle velocity.

Temperature reduces with altitude as does pressure.

Bullets do have a flatter trajectory at higher altitude. - Breech pressures & muzzle velocity remains the same as long as the temperature doesn't change.

Ian

So my point about this being academic is well illustrated by your response.
The OP is investing in an experience that he may or may not get to repeat and he should enjoy that.

The point is stuff behaves differently in different environments.
Your point about temp reducing with altitude works on the assumption that you're holding the environment constant.
It doesn't hold in reality. KZN is vastly different than the highveld or the free state or the northern borders and I know from experience that stuff behaves differently.

Personally, when I go to SA again I won't be dwelling on the theory.

 

[Muir]

Hi Muir.
Is N165 a 'Temperature Stable' Powders? It is single base but that may be over simplifying how it is achieved.

As a Man that Shoots in extreme spreads of Temperature do you find the so called 'Temperature stable' Powders are indeed so?

Thanks.

Yorkie.

I don't know about N165 (can't get it here without jumping through hoops) but I've never seen a hot load at 0F degrees that wasn't problematic -or at least raise an eyebrow- at 105F. Many loads i worked up at 115 and 120F became quite anemic at 80F when I returned to Montana. Down right sooty at 10F. ~Muir

 

[270Buck]

I don't know about N165 (can't get it here without jumping through hoops) but I've never seen a hot load at 0F degrees that wasn't problematic -or at least raise an eyebrow- at 105F. Many loads i worked up at 115 and 120F became quite anemic at 80F when I returned to Montana. Down right sooty at 10F. ~Muir

When I was load testing coincidentally it was a reasonably warm day in mid England for March, 12C (54F)

0F is -17C. Fortunately not often if at all does temperatures ever drop to that level in the majority of England.

The expected hottest temperature I will have when in SA is 30C (86F). So I am fairly sure I am not expecting the extremities you have described Muir.

The altitude is about 1000 foot.

I will let you all know on my return how they performed on game in Africa.