Join Date: Dec 2002
Location: Northwest UK & NSW Australia
In a m100 between 10-15kg.
I just sent a j-custom last week and put 11kg and it got there fine.
If you stick a decent weight on they usually don't bother too much, but if you put say 5kg on then they'll weight and slam you with a fee for taking the p*ss!
Tip..... I was going to use Fedex or ups but they wanted over £140. Parcel force (which then gives it to USPS) was only £87 (plus £5 for £1k insurance) - I shipped it Friday afternoon and it arrived in Colorado at 9.30am on Monday morning. I've always been sus about Royalmail but they did a good job and their tracking numbers are continuously updated not just every evening.
Give them a try (Datapost tarrif)