The right bolt for the TenPoint Viper S400
The correct bolt length, nock and minimum grain weight for the TenPoint Viper S400, and what stops a dry-fire.
Dry-fire warning
Bolt length, nock type and minimum grain weight are quoted from each manufacturer's published arrow data and owner documentation, cited on every page. A nock or grain-weight mismatch can cause a dry-fire that damages the bow and can injure the shooter. Confirm against your own owner's manual before shooting, and never drop below the stated minimum total grain weight.
| Bolt length | 20 in |
|---|---|
| Required nock | Alpha-Nock HP |
| Factory arrow | Pro Elite 400, 410 gr, +/-.003 straightness |
| Rated speed | 400 fps (410 gr Pro Elite 400) |
| Minimum total grain | 410 gr total (Pro Elite 400) minimum |
TenPoint Pro Elite 400 20 in carbon arrow with Alpha-Nock HP
Search Amazon for TenPoint Pro Elite 400 20 in carbon arrow with Alpha-Nock HPaffiliate searchField notes
The Viper S400 is a 2019-and-newer TenPoint, so it falls under the Alpha-Nock requirement. It shoots the 20-inch Pro Elite 400 arrow with an Alpha-Nock HP. Twenty inches is the standard TenPoint minimum length for a full-size bow like this.
Being a mid-priced bow does not exempt it from the Alpha-Nock rule. Any 2019-and-later TenPoint that is fed an Omni or flat nock loses its warranty and gains a dry-fire risk.
Related crossbows and the nock
Sources: TenPoint - What nock should I use with my crossbow (FAQ) · TenPoint - Alpha-Nock use required on TenPoint and Wicked Ridge crossbows · TenPoint - Minimum arrow length FAQ