You should consider the T&T line rating as the highest line number of the common 2 wt spey line designation. In other words, the T&T 1510 should be considered to be a 9/10 rod, while the Loomis GLX or Loop are 10/11 rods. If you want a 10/11 rod from T&T, you need to get either the 1511 or the 1611.
All the T&T 2-handers are rated this same way. For example: the T&T 1409 is an 8/9 rod, the 1307 is a 6/7 rod, etc.
Sorry about my misinterpretation of your question. The T&T's weigh a little more than the GLX and about the same as the Loop Blue. The difference between the T&T, GLX, and Loop Blue is so small that it really doesn't matter.
Here's some T&T rod weights I got from their catalog of a couple years ago. Their probably still really close.
1208-4 7.25oz.= 205.5grams
1309-3 8.10oz.= 229.6g
1409-3 9.05oz = 256.5g
1509-3 9.95oz= 282g
1510-3 10.1oz= 286.3g
1510-5 10.2oz= 289.1g
I just sold my T&T DH1510-5 a few months ago. When I had it, I weighed it on my digital postal scale and it weighed more like 12.6oz. That might not seem like a big difference, but it's about 20% more than that catalog shows.
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