Re: Quickload - how accurate is it????
I use quickload to tell me case fills, presssure and velocity for selecting which powders to try. I use it to decide on starting loads and load increments. I use it to give what velocities I should not exceed becaue of excessive pressure.
I don't just use it to just predict a good load and then use it. Quickload cannot tell what specific load will be accurate in a specific firearm. Quickload does not know about barrel vibration. Quickload does not know about bullet stability. Picking a good load requries shooting tests. Quickload is very good for picking a few poweders which are likely to work well while rejecting hundreds of others.
The OP's post of 1 FPS varition from Quickoad to actual chronograph tests may happen occasionally. My experiences though is that if i just use Quickload's tables for case capacity engraving force, bore friction for factory components 2% velocity variation is typical for "normal" supersonic loads with good case fills. ( ie: +/- 30 fps @ 3000 fps.) That's about the same level of accuracy that load books give. Some cartridges have considerable variation in capacity from the tables, particularly widlcats, antiques, and proprietary (non SAAMI) cartridges.
Quickload works well for predicting the performace of subsonics, for unusual projectles such as very light saboted bullets or plastic projectiles or very heavy projectiles. There are few books which help on those subjects. Quickload is also useful for showing the effect of barrel length, especially because it can be set up to include bore friction in the velocity calculatons.
Unlike loadbooks Quickload gives other useful calculations such as muzzle pressure, bore dwell time, and recoil including the recoil effect of the propellant.
Last edited by LouBoyd; 05-13-2009 at 09:08 AM.