You have to be doing some insane things to exceed 100g's with our rockets, so 400 g's is overkill. We use two accelerometers on our board, a 200G ADXL375 and a 32G LSM6DSO32. The chips aren't cheap and are getting harder to find, but they are available on break-out boards for DIY. The 32G is higher resolution and the 200G data stream is used when going over 32G's. We've run dozens of 15K flights with both of them and it is fascinating to see the data side by side. Since we correct for bias on the pad, they both integrate velocity accurately to apogee within milliseconds apart. Also, we routinely exceed 32G's, but the LSM6DS still nails apogee within milliseconds, since the "pegged time" is equally up and down. That said, it is very helpful to have the higher gee data. On a two stage flight last Saturday, our separation charge was oversized and it popped at 66 gees of force on the sustainer. It worked just fine and there was no damage, but we could see in the data that the charge was way oversized -- and it put the electronics and other components at risk. We also don't use any filtering, as it messes with the velocity integration.