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EN: General Discussions
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Load data compare to powder manufacturer
Hi, I recently joined to find data for 8x68s. Not many are available from powder or bullet manufacturer.
However, for the few I had there is a huge difference that I find hard to explain.
ex. From vihta published data. N160 and accubond 200 gr. Max load listed at 70.r gr.
Xxl reload give 64.3 gr as max load … and a lower MV of course.
Any insight ?
Cheers
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Max
Jul 29
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Hi - this topic is the most commenly discussed and we get many emails with similar enquiries. However, we are happy to explain again:
When comparing load data, make sure you compare apples with apples, i.e. load data based on similar inputs
Our inputs are always stated on each load page, most importantly: COL, case capacity and safety buffer
In this particular case, you compare our data with a 3.374" to 3.425" at VH. We have a safety buffer of 10% while VH assumes 0
You can use our personalized load calculator and adjust our values to those og VH and get to a max load of 67.7 g vs. 70.4 of VH - a difference of 5%
Unfortunatly, VH only specifies that they use a RWS case but do not state the case capcity. if it is larger than what we assume, the gap would be reduced further.
Hope this helps to clarify!
Custom Bullet Load
Good afternoon Sydney time. I am loading some 9mm 140 grain Semi Wad Cutters with Lovex powder. I can’t seem to find the brand of bullet I have, which is an Aussie Brand called Black Widow. Is there a way to enter this name in my diary? I can only see the drop down selection and its not there. Thanks in advance.
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Max
Jun 09
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No - you can only add existing bullets. We will add Black Widow and in about 2 hours you can add / request your bullet with the necessary details here: https://www.xxlreloading.com/request-new-bullet-to-be-added here:
Hank
I'm reloading for 7mm prc. 160 grain acubond bullet. Using imr 7828 scc powder. 66.8 grains was what came up. This over pressured. Fps was 3220. Can anyone tell me how much to back down on grains to make it not over pressure.
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Unknown member
Aug 19
I hadn't seen this until now. I double checked a couple of load settings and believe the 66.8gr used is just under 3000fps using xxl and a 26" barrel. The closest data using the 162 X bullet using the same 66.8gr value pushed it to 3075. The only time I have seen this happen before was a bad CIL L3 value either cut short in the chamber or the brass was not trimmed. The interference of this dimension is very small and if the neck gets pinched against the bullet. So the cartridge is fighting to expand the neck to release the bullet. Very common on military 556 where you see the neck ripped off. Both IMR7828 & IMR7828SSC are explosive and the SSC type more so. My calculations attached.
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Hello Tony. Nice Mully? Did I load some ammo for you?