Depends on the size.
If you want a good idea.
2 x packs of six sausages = 2 sheets of ready rolled pastry.
But the pastry sheet into three equal size along the SHORT edge. Put it straight back in the fridge.
Divide the sausage meat into 6
I roll the logs up in cling film (easier to keep...
The meat in a chicken pie is always going to be reheated.
Firstly the chicken is roasted.
Secondly you aren't going to put a hot filling into a pie case.
It will melt the butter prior to going in the oven. When in the oven the heat causes the butter to release steam with creates the rise.
I make sausage rolls.
1) Don't use all butter puff pastry - since they are fatty enough.
2) Buy good quality sausages with a high meat content of 90% at least.
3) Add to whatever is in the sausages to intensify the flavour. For example - I like the Waitrose ones with nutmeg and add more...