Bottle priming 101
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Always use the same sugar. You'll get similar grain size, therefore the same density. Dextrose for me.
Buy proper measures. Nice stainless tablespoon, desert spoon, teaspoon, 1/2 teaspoon and 1/4 teaspoon baking measures.
Make sure every prime is accurate. Use the back of a knife to give you a proper level measure.
Get a big funnel. One with spout that just fits in the neck of a bottle.
Start with the accepted norms. 1/2 tsp for ales, a bit more for lagers go with 1 tsp if you want proper fizz.
Keep records. That way you can adjust carbonation based on style, FG, etc. in future brews.
While I agree that batch priming is more consistent, for quick stock-up kit brews with limited space resource, bottle priming is, for me, preferable. I brew in my FV with the little bottler tap, bottle prime and bottle straight from FV. No racking, nothing. Brew... Bottle... Wait... Drink. :drink:
When I have more space I'll probably start batch priming more, using more exotic sugars etc and of course bottle priming with honey, treacle, molasses, syrup and such is a total non-starter!
Anyway, don't dismiss bottle priming out of hand, it works and if you apply discipline to it it works well.