Keep in mind that most crossbow companies' products are proprietary.
Meaning, Barnett crossbows must use Barnett bolts, cables, nocks, etc. Likewise for me, having a Ravin R10 crossbow. This kinda sucks, because it's not like a compound bow, that we can use whatever brand of arrows, nocks, etc. to build what we want for arrows.
I called Tech Support for Ravin and approached them with my idea of building a heavier bolt with high FOC, using weight tubes, etc. Oddly enough, they didn't "bulk" at the idea and said they have a 500 grain bolt offering. I mentioned adding weight tubes, 100 gr. brass inserts and a 150 gr. broadhead and the Tech guy thought it was a great idea. However, he did mention that it's going to effect the speed and trajectory.
I knew and expected that, but it's a possible build.
If I used one of their 500 gr. bolts, added a 5 grain per inch weight tube, a 100 gr. brass insert and a 150 grain broadhead, I could potentially have a 800+ grain bolt. Utilizing the power of the crossbow's ability, the penetration factor would be incredible!!!