Shot the Tubb Final Finish fire lapping system on Sunday and here’s the results
The system comes in 5 groups, 10 bullets each, from most aggressive to least aggressive.
I loaded them per instructions with a starting load 42g of H4895
Headed to the range, shot a base line 3 shot group with my hunting load, then proceeded to follow the steps of shooting the most aggressive 10 round group, clean throughly, then shoot the next, clean, and repeat until all 50 are fired
After completing the process I cleaned the barrel and shot a 3 shot comparison group with my hunting loads. Before on the top, after on the bottom
I also chronographed these shots, 2,300 fps before and 2,290 after. Interesting how the holes are ragged before and clean after.
Finally, here’s how the bore looked before. Note how the radial tool marks transition the lands and grooves
Here’s the after. Tool marks on the lands are completely gone and the center of the grooves have been improved. The top left pic shows the throat. It doesn’t seem to have been moved very much
My conclusion is this Tubb system did have a positive effect on this barrel. It definitely coppers less and was easier to clean. Might have improved accuracy but I’ll need to shoot more to know that for sure.
It takes some time and a bit of effort to perform this process. I would not use this on any of my custom barrels but if you had a rough commercial barrel that was fouling a lot, had related accuracy issues, I don’t think you’d be hurting anything if you gave it a try