Norma Tipstrike 170gr load. Danger from Norma?
Hi Community
I am working up new loads for the Norma Tipstrike 170gr together with Norma 202 powder and I am totally confused.
When searching the XXL reloading site, I find a recipe with a Max load of of 40.1gr, Min 33,6.
This (max) load should result in 87% of max pressure.
Now, moving over to Norma homepage, I find the recommended max to be 44.0gr and Min 41.2gr...
How can there be such a massive difference between Max and Min between these two sources?
Further, I have checked in Gordons Reloading, which calculates the Max pressure with the XXL Reloading Max (40.1) to be around 96% of Max pressure iso the 87% . Of course, the Norma load (44.0) gives a MASSIVE (and dangerous) overpressure.....
Looking at Barnes TTSX 168gr indicates the same phenomena; Barnes figures differ MASSIVELY from XXL Reloading and their Max load gives and overpressure indication in Gordons....
I know that Gordons is not an official source, but being fairly new to handloading I am now at loss.
Anyone who could explain and assist?
Many thanks
Avoid using load data for LEAD bullets for LEAD FREE bullets and the other way around as well, the construction is vastly different and it might cause severe issues. The capacity behind the bullets will change and so will the pressure. Better to use comparable LEAD bullets with slightly different weights. MY OBSERVATION is that puplished load data pushed the pressues a bit high in the chase for higher speeds. So, be carefull and do test max loads straight off. But note that XXLRELOADING is using CIP max pressure of 60.000PSI where most load data probably is using SAAMI max pressure of 62.000PSI. This will of cause also make a difference. Also XXL have a default 10% safety buffer. There is no reason for not using SAAMI pressures in my mind, but this cannot be toggled in XXL. Also be carefull using GORDONS until you have some experience, small changes to settings may render your data useless and dangerous. Don't worry you will quickly get into it and it is a great tool. But start by taking a look at other load data with comparable bullets and powder. Unfortunately you have to make your own decision on how to proceed.