Vihtavuori Powder

Post Reply
RugerfanAustria
Posts: 44
Joined: Tue Aug 10, 2021 12:36 pm

Vihtavuori Powder

Post by RugerfanAustria »

Hello.

Are any of you interested in Vihtavuori powder or professional gas pressure measurement by the Austrian authority for weapons testing? I would have to offer 44 Special, 45 Colt, 44 Mag and 454 casull.

contender
Posts: 230
Joined: Tue Nov 04, 2014 7:33 am
Location: Lake Lure NC

Re: Vihtavuori Powder

Post by contender »

If I understand your post correctly,, you are offering to test Vihtavuori powder in those calibers for the pressure curve?

I'd be curious about all of those calibers & which powders were tested.

RugerfanAustria
Posts: 44
Joined: Tue Aug 10, 2021 12:36 pm

Re: Vihtavuori Powder

Post by RugerfanAustria »

contender wrote:
Sun Sep 26, 2021 8:24 am

I'd be curious about all of those calibers & which powders were tested.
Although these are official measurements by the Austrian authorities according to CIP, please be careful as different batches of powder, detonator and possibly bullet behave differently. Every reloader acts independently.

These measurement protocols are only intended to provide an overview.
20210926_205207~2.jpg
20210926_205020~2.jpg
20210926_204931~2.jpg
20210926_204758~2.jpg
20210926_204726~2.jpg
I know the pictures are not good but I will submit better ones soon.

Best Regards

contender
Posts: 230
Joined: Tue Nov 04, 2014 7:33 am
Location: Lake Lure NC

Re: Vihtavuori Powder

Post by contender »

Excellent.
Better pics will make the reading easier.
If I see it right,, they only use one powder charge, and fired maybe (3) rounds? Am I correct in this?

RugerfanAustria
Posts: 44
Joined: Tue Aug 10, 2021 12:36 pm

Re: Vihtavuori Powder

Post by RugerfanAustria »

Not quite. The authority normally wants 6 cartridges for a measurement, which is related to the cartridge testing regulations. The first cartridge is used to warm up the measurement run and the following 5 are included in the evaluation. Sometimes, however, an incorrect measurement happens so that only 4 cartridges are counted. In the test rules for the statistics, the lowest value for K1n is 5.75 for 5 measurements. If more cartridges are measured, the factor K1n is lower. If the sum of the mean max gas pressure + the standard deviation * K1n is less than 1.15 * pmax, the cartridges are considered safe.

Best Regards

Post Reply