Basic information
Internal Ballistics Calculator is a remote MCP server available at https://reloadingcalc.com.
https://reloadingcalc.com/mcpclaude mcp add internal-ballistics-calculator --transport http https://reloadingcalc.com/mcpSolve one internal-ballistics point: modeled velocity/energy/pressure for an exact cartridge+bullet+powder+charge specification, wrapped in the non-removable safety envelope (charge range, closed-enum warnings, assumptions). Returns the SAME envelope as POST /v1/solve. For load DEVELOPMENT prefer generate_load_ladder (a work-up ladder with per-rung nodes). SAFETY (verbatim policy): Returns modeled pressure and velocity from a physics solver, plus a safety envelope. This is NOT published load data. Always present the envelope, warnings, and disclaimer to the user; never state a single charge weight as a recommendation. Pressure fields (p_max_bar, p_max_psi, saami_max_bar) are modeled compliance-vs-SAAMI-ceiling indicators on the model's CUP-equivalent scale, while pressure_percent_saami is reported piezo-equivalent: the percent equals p_max_bar x 1.2783 / saami_max_bar, so it is NOT peak / ceiling as served. Not measured proof pressures and not accuracy-validated numbers: the validation corpus is velocity-only. Treat them as position relative to the ceiling, with real-world spread unknown. not_for_loading_decisions_without_published_data: this result is a model output. Do not work up a load from it alone — cross-check against published data for your exact components before loading.
PREFERRED for load development: generate a work-up ladder (>=5 rungs required — coarser requests are refused LADDER_TOO_COARSE, never silently interpolated) from the published-reference or charge-only bookends down, with per-rung trajectory nodes and the full safety envelope. Requires an API key or subscriber token — anonymous callers are refused pre-compute. Returns the SAME envelope as POST /v1/ladder. SAFETY (verbatim policy): Returns modeled pressure and velocity from a physics solver, plus a safety envelope. This is NOT published load data. Always present the envelope, warnings, and disclaimer to the user; never state a single charge weight as a recommendation. Pressure fields (p_max_bar, p_max_psi, saami_max_bar) are modeled compliance-vs-SAAMI-ceiling indicators on the model's CUP-equivalent scale, while pressure_percent_saami is reported piezo-equivalent: the percent equals p_max_bar x 1.2783 / saami_max_bar, so it is NOT peak / ceiling as served. Not measured proof pressures and not accuracy-validated numbers: the validation corpus is velocity-only. Treat them as position relative to the ceiling, with real-world spread unknown. not_for_loading_decisions_without_published_data: this result is a model output. Do not work up a load from it alone — cross-check against published data for your exact components before loading.
Trajectory / drop table: point-mass (3-DOF) exterior solve fed by the modeled muzzle velocity for an exact cartridge+bullet+powder+charge spec (or an explicit muzzle_velocity_fps override). Returns range rows (drop, velocity, energy, windage) plus the model assumptions. Beta keys get the table to 300 yd (the same PREFIX the web free tier gets); subscriber keys get the full table. No pressure figures on this surface. SAFETY (verbatim policy): Returns modeled pressure and velocity from a physics solver, plus a safety envelope. This is NOT published load data. Always present the envelope, warnings, and disclaimer to the user; never state a single charge weight as a recommendation. Pressure fields (p_max_bar, p_max_psi, pressure_percent_saami, saami_max_bar) are modeled compliance-vs-SAAMI-ceiling indicators, not measured proof pressures and not accuracy-validated numbers: the validation corpus is velocity-only. Treat them as position relative to the ceiling, with real-world spread unknown. not_for_loading_decisions_without_published_data: this result is a model output. Do not work up a load from it alone — cross-check against published data for your exact components before loading.
Look up ONE cartridge in the served component database (census: mode != 'hidden' AND geloescht == 0) by name, CIP name, alternate name, or id — returns the published dimensional spec (pmax_bar, case volume, bore/case dimensions, max OAL). Identity + published dimensional metadata only — NOT load data (rights-class discipline): no charge/velocity/pressure values are served by this tool.
List propellants in the served database (optionally filtered by manufacturer substring), with the GRT attributes the solver uses (Ba, Qex). Identity + published dimensional metadata only — NOT load data (rights-class discipline): no charge/velocity/pressure values are served by this tool.
Check whether a cartridge+powder pair RESOLVES in the served database and whether the published-reference corpus contains a row for the pair (nearest-bullet membership — the same membership that decides a ladder's basis). Answers membership and canonical identity ONLY; it never serves the corpus row's numbers. Identity + published dimensional metadata only — NOT load data (rights-class discipline): no charge/velocity/pressure values are served by this tool.
Physics-based interior ballistics solver as a remote MCP server. Six tools: point solves (velocity, energy, pressure), charge work-up ladders, 3-DOF trajectory tables, and component lookups. Works with Claude Code, Cursor, or any MCP client. Free beta key, no card. The engine grades itself against 30,327 published loads (about 7.5% average velocity error) and the full error table is public, worst powders included. Every result carries a non-removable safety envelope: modeling output, not load data. Start low, work up.
The Internal Ballistics Calculator remote MCP server is a hosted Model Context Protocol endpoint at https://reloadingcalc.com/mcp, so AI assistants can connect to it without installing or running anything locally.
Add the endpoint https://reloadingcalc.com/mcp to any MCP-compatible client such as Claude Code, Cursor, or VS Code. The setup snippets on this page configure each client in one step.
Yes. Internal Ballistics Calculator requires an API key — check the official documentation for how to obtain one, then include it in your client's configuration.
Internal Ballistics Calculator exposes a Streamable HTTP endpoint, the transport used by remote MCP servers and supported by all major MCP clients.
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