Vihtavuori load data is published by the Finnish ammunition manufacturer Vihtavuori Oy and covers their powders across rifle, pistol, and shotgun cartridges

Vihtavuori publishes load data in two main formats: printed reloading manuals and a free online database. The printed manuals are numbered by series — the most recent is the N500 series — and list powder charges, bullet weights, primers, and velocity results for each cartridge. The online database, accessible at vihtavuori.com, covers the same cartridges and is updated more frequently than print editions.

The data itself is organized by cartridge, then by bullet weight within each cartridge. Each load shows the powder charge range (starting load and maximum load), the bullet type and weight, the primer type, the case brand used in testing, and the velocity achieved. Some loads also include pressure readings in bar or PSI, though not all cartridges have pressure data published.

Vihtavuori powders are single-base and double-base formulations designed for both rifle and handgun use. Their powders are sold under names like N110, N120, N130, N135, N140, N150, N160, N165, N170, N310, N320, N330, N340, N350, and others. Load data exists only for Vihtavuori powders — you cannot use this data for other manufacturers' powders, even if they appear similar in burn rate.

Key Takeaways

  • Vihtavuori publishes load data in printed manuals (N500 series) and online at vihtavuori.com, updated more often in the online version.
  • Each load lists the starting charge, maximum charge, bullet weight, primer type, case brand, and velocity — pressure data is included for some cartridges but not all.
  • Load data is specific to Vihtavuori powders and cannot be used for other powder brands, even if burn rates appear similar.
  • The online database is free and searchable by cartridge, making it faster than flipping through a printed manual for a single load.

Where to find Vihtavuori load data online

The official Vihtavuori website hosts a searchable load data tool at vihtavuori.com. You select your cartridge from a dropdown menu, then the database returns all published loads for that cartridge. The interface is straightforward: choose the cartridge, and the results show each load with powder charge range, bullet weight, primer, case, and velocity.

The online database is updated more frequently than printed manuals, so it often contains loads for newer cartridges or revised data before a new manual is printed. There is no cost to access it, and you do not need to create an account or provide contact information.

Some reloading forums and third-party sites republish Vihtavuori data, but the official source is always more reliable because it reflects the most recent testing and any corrections Vihtavuori has made. If you find conflicting data between a forum post and the official site, trust the official site.

How to read a Vihtavuori load listing

A typical Vihtavuori load entry shows: cartridge name, bullet weight and type, powder name and charge range, primer type, case brand, and velocity. For example, a .308 Winchester load might read: "168 gr Sierra MatchKing, 43.5–45.5 gr N165, CCI 200 primer, Lapua case, 2,650 fps." The first number (43.5 gr) is the starting load; the second (45.5 gr) is the maximum load.

The starting load is the minimum safe charge for that bullet and powder combination. The maximum load is the highest charge tested by Vihtavuori without exceeding their pressure limits. You begin at the starting load, fire a test group, then increase the charge in small increments (usually 0.3 to 0.5 grain for rifle, less for pistol) until you reach the maximum or until accuracy or velocity plateaus.

The case brand matters because case capacity varies slightly between manufacturers. Vihtavuori tests with a specific brand — often Lapua, Starline, or Federal — and the charge weights are calibrated to that case. If you use a different case brand, the actual pressure may be slightly higher or lower. This is why experienced reloaders often use the same case brand as the load data specifies, especially when working near maximum loads.

Printed Vihtavuori manuals and when to use them

Vihtavuori publishes printed reloading manuals in the N500 series. The most recent editions are the N500 (general rifle and pistol) and specialized manuals for specific cartridge families. Printed manuals are useful if you reload without internet access, prefer a physical reference, or want historical data from older loads that may no longer be on the website.

Printed manuals are also useful for learning the reasoning behind load development — they often include sections on powder selection, primer choice, and how pressure and velocity interact. The online database is faster for looking up a single load, but a manual teaches the principles behind the numbers.

Printed manuals can be purchased through reloading supply retailers, gun shops, and online booksellers. They are not free, and prices vary by retailer and edition. If you own an older manual, the data is still valid for the powders and cartridges it covers, though Vihtavuori occasionally revises loads based on new testing.

Differences between Vihtavuori data and other powder manufacturers

Each powder manufacturer publishes load data only for their own powders. Vihtavuori data cannot be used for Hodgdon, IMR, Alliant, or other brands, even if two powders have the same burn rate designation. Burn rate is a rough guide to speed, not a precise specification, and the actual pressure curve and energy release differ between formulations.

Using load data from the wrong powder manufacturer is dangerous. A load that is safe with Vihtavuori N165 might produce excessive pressure with a different powder of similar burn rate. This is why reloaders must match the powder name exactly to the load data they are using.

If you want to reload with a powder other than Vihtavuori, you must find load data published by that powder's manufacturer. Hodgdon, IMR, Alliant, and other companies all publish free online databases similar to Vihtavuori's. Starting from scratch with a new powder requires new load data, not a conversion from another brand.

How pressure and velocity data is used in load development

Vihtavuori publishes velocity for each load because velocity is a practical indicator of pressure. Higher velocity usually means higher pressure, and lower velocity usually means lower pressure. By chronographing your own loads and comparing the velocity to Vihtavuori's published velocity, you can estimate whether your loads are safe or trending toward pressure problems.

If your velocity is significantly lower than published (more than 50–100 fps below, depending on the cartridge), it may indicate a problem with your equipment, technique, or components — not necessarily that the load is unsafe, but that something is not matching the test conditions. If your velocity is higher than published, it suggests your components or technique is producing higher pressure, and you should reduce the charge weight.

Pressure data (in bar or PSI) is included in some Vihtavuori loads but not all. When pressure data is available, it shows the maximum pressure Vihtavuori tested at that charge weight. This is useful for reloaders with a chronograph and access to pressure-testing equipment, but most handloaders rely on velocity as the practical indicator.

Common mistakes when using Vihtavuori load data

The most common mistake is using load data for the wrong powder. A reloader might see that a Vihtavuori load uses a powder with a similar burn rate to a powder they own and assume the data transfers. It does not. Always match the powder name exactly.

Another mistake is ignoring the case brand specified in the load. Vihtavuori tests with a specific case, and using a different brand can change pressure. This is especially important when working near maximum loads. If you must use a different case, reduce the charge by 0.5 to 1.0 grain and work back up carefully.

A third mistake is starting at the maximum load instead of the starting load. The starting load exists for a reason — it is the minimum safe charge for that combination. Beginning at maximum and working down is backwards and wastes ammunition. Always start low and work up.

Finally, some reloaders assume that published velocity is what they will achieve. Velocity depends on barrel length, ambient temperature, and other variables. Vihtavuori publishes velocity as a reference point, not a may provide. Your velocity will likely differ, and that is normal.

Frequently Asked Questions

Can I use Vihtavuori load data for a different powder if the burn rate is the same?

No. Burn rate is a rough classification, not a precise specification. Different powders with the same burn rate can produce different pressures and velocities. You must use load data published by the manufacturer of the powder you are using. Using data from the wrong powder is unsafe.

Is the online Vihtavuori database free?

Yes. The database at vihtavuori.com is free and requires no account or registration. You can search by cartridge and view all published loads for that cartridge at no cost.

What if I cannot find load data for my cartridge on the Vihtavuori site?

Vihtavuori publishes data for common cartridges but not all wildcat or obscure rounds. If your cartridge is not listed, you will need to find data from another powder manufacturer or consult a reloading manual that covers multiple powders. Do not attempt to extrapolate from a similar cartridge.

Do I have to use the exact case brand Vihtavuori specifies in the load?

No, but case brand affects pressure slightly. If you use a different brand, reduce the starting charge by 0.5 grain and work up carefully. This is especially important near maximum loads. For starting loads, the difference is usually small enough that the published charge is still safe.

How often does Vihtavuori update their load data?

The online database is updated more frequently than printed manuals, but Vihtavuori does not publish a schedule. Major revisions or new cartridges may appear on the website before they appear in a new printed manual. Check the website periodically if you reload the same cartridge regularly.