Recreational Software Inc. (RSI) are the makers of the PressureTrace pressure sensing system that can be linked to a personal computer and used to measure firearm chamber pressures. RSI also make other shooting software and the excellent CED Millenium 2 chronograph.

The Accurate Reloading website contains a forum with numerous helpful threads to shooters and hunters alike. Follow the link to the 'Terminal Performance' thread in the Big Bore category which charts the history of Michael McCourry's development work. Be warned, though, this is one of the longest and most posted thread on the AR website, so you're in for a lot of reading. Or you can skip straight to the last page and join in to talk to Michael directly.

The Ammoguide website contains a wealth of information about all common cartridges as well as some very unusual wildcats. You will find information here about cartridge loads and case capacities, and there are useful cartridge comparison tools. Although you can use some of the website's features for free, full use of features requires an annual subscription, but for around $20 per year, the information and tools that you have access to are well worth it if you are a keen shooter.

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