Often, when you buy meat from the store, it comes with guidance on how long the meat needs to be roasted, presumably calculated as a function of its weight. Is there some well known general algorithm for calculating how long to roast various types of meat (e.g. for display on packaging). Perhaps something like:  roasting time = c * weight of meat  Assuming the algorithm is this simple, is there some reference of ideal oven temperatures and scaling constant c for each type of meat (chicken, beef, pork etc)? Relatedly, is there a well known set of algorithms for converting between say, fan oven, AGA, and/or gas mark standards for oven temperature? I'm assuming these facts must be well known in meat supplier's product development departments, due to the labeling I see on meat that I buy. However, having Googled it a fair bit, I can't find these details summarized anywhere. 
I use nylon straining bags for making wine. You can get them in various sizes at homebrew stores. (for example: http://www.midwestsupplies.com/nylon-straining-bag-18-x-32-coarse-mesh.html) I'm sure they'd do the trick for what you need. Although this may only work for passing juice, you might inquire at your local homebrew store if they have a slightly larger mesh size. 