6.5x55 SE Hornady SST Reload recipe

N140 defo too fast. N150 is shown on the Vit load data for a 139gr bullet with the max charge being 37gr. However that only gives a 81% fill.
So I would say that the N150 is also too fast. N160 and N555 will be be much better both in case fill and velocity.
 
The great N150 vs N160 debate in swede🙈

This depends on your barrel length. Most data is with 24” barrels or above. If you are using 20-21” barrels then use N150. The percentage burn on N160 is too low in short barrels and will lead to issues.

The N500 series is a good shout. As is RS62/RL17 but I guess from your question you have access to N150

BE
 
I use N560 for a very accurate load, although just shy of 49gns, with 139 's, dont need them up to the lands for a jump, go with factory length.
good luck
 
The great N150 vs N160 debate in swede🙈

This depends on your barrel length. Most data is with 24” barrels or above. If you are using 20-21” barrels then use N150. The percentage burn on N160 is too low in short barrels and will lead to issues.

The N500 series is a good shout. As is RS62/RL17 but I guess from your question you have access to N150

BE
Do you mean RS60/RL17 which is the same powder? Or are you talking about 2 different powders?
 
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