Iv used the bullets into slabs 300mm deep, I think that general purpose independent needs to be pull tested to about 6kn/m2 when ties are spaced at 16m2 (please correct me if I'm wrong)
When using these bullets in the above slabs iv easily achieved 10-12kn/m2 during pull tests, my advice would be to increase the frequency that you pull test? I think that the usual test frequency is about 5% of all ties, but as we used to have our own tester I used to test 50-75% of all the ties on small jobs of less than 20 ties or maybe 20-30% of ties upto 100.
I used to hump round the drill, all 110kv cables, a bag full of bullets, ring bolts, threaded bar, lump hammer and the tie tester,
I don't know if this is enough to satisfy the HSE so good luck, hopefully someone will be able to give you some better advice.
I am a big fan of these bullet ties especially when used with threaded bar and on jobs that need rendering as the threaded bar is only 10mm thick the render doesnt have big patches in it as you strip the ties out and the patching in is barley visable once the scaffold is down.
