I'm currently testing a BD400 to compare with my Matrix 380 and Matrix 405. Both of the Matrix xbows are optimized to the hilt with Air Brakes, Dr Stirrup kits, aftermarket strings, Optimizers/2-8 lighted Duralyt scopes, TT triggers, double shrink wrapped arrow hold down springs, custom Zombie arrows. The BD400 is about 5-7'/sec faster than the Matrix 380 and significantly slower than the 405 in spite of the number(400 & 405). The BD400 has a vastly superior Bullpup design, is more compact, handles and holds better, stresses the limbs better because of the limb mounting geometry . It's just a more efficient design. The testing has just begun so no real results yet. Incidentally, in another test going on of testing SK200 and Blazer vanes in helical vs SK300 vanes in offset, consistent 3-shot 1/2" groups are being made. This is in dead calm conditions with indexed FOC broadheads, off of a Hart Windage Adj rest/#13 bag. The accuracy of the M380 & M405 is hard to believe. I'm hoping and expecting To equal this with the BD400. If you're in the market for a Xbow , consider this Xbow!
I'll be interested to see how it goes, as I have a new BD400 too.
I have set mine up similar to your 380 & 405 with Air Brakes, Dr Stirrup DB killers & bumpers, JBK aftermarket strings, HAA Optimizer & Zeiss 3-9x40 scope, double shrink wrapped arrow hold down springs, Zombie arrows.
Have just finished a custom 2" cherrywood stock extension and have a trigger tech waiting here.
I've also added a VooDoo cheekpiece raiser, but it really doesn't fit well and I need to work that out.
I just got it back from Excal as they had to fix the rear stock/rail screw insert and they worked over the factory trigger which was previously awful with a lot of creep and walls.
It will be a week or so before I get back up to the cabin and can put it all back together and shoot it to see how the trigger works now. If no good, I'll put the TT in.
It was shooting really good until the screw started coming loose, so I'm hoping the fix will settle it back down.
Not sure of the speed, don't have access to a chrony, but might have to get one.
With a 400-420 gr bolt if I'm getting 370-380 FPS or better, I'd be happy enough.
Shortly after getting my M380, I started trying to quieten it and accuratize it. Then the same with the M405. Incidentally, I use 3 different strings: Boo, Vixenmaster and the stock strings from Danny Miller (blue for BD400). The limb mounting geometry of the BD vs the original Matrix series reduces speed some but also reduces the stress on the limbs and surly enhances reliability. I've found that the factory string at exactly 2.0" from the end of the riser is the fastest brace height and string. Unlike the 2 highly accessorized Matrix, I'm minimally equipping the BD which is an inherently gentler and quieter xbow. I'm only going to use a Boo smoothened trigger, DrStirrup string bumpers, wrapped stirrup, foam packed stock, double shrink wrapped arrow hold down spring bent such that it won't contact the riser after the shot, 2-8 Duralyt/Optimizer and custom Zombies/FOCs. I'm leaving off the Air Brakes. Locktite or silicone the trigger retention bolts as well as the others. I think the BD will prove to be Excalibur's future high performance xbow. It is gentler and slightly more accurate than the Matrix 380 or 405. It's speed is only about 5'/sec faster than the M380 even though it's power stroke is between 0.1-0.2" longer than the M405 with the same limbs. It's the mounting geometry that reduces the stress , and power stored, in/on the limbs.