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Knowledgebase : Product Support > Ballistic questions
Through testing, we have found that Collet sizing a neck to .001 inch under the intended bullet diameter gives the optimum amount of bullet pull with the least amount of runout. One can order undersized mandrel for a tighter fit on the bullet , but...
T=150 x D --- R here: T is the twist required (number of inches for one revolution), D is the bullet diameter (in inches) R is the bullet length to diameter ratio, (length divided by diameter) Conversely, to find out what length bullet will...
If you want to determine weight in grains for something you have in pounds, simply multiply the pound weight by 7,000. If you want to calculate weight in pounds for something you have in grain weight, divide the the grains by 7,000.
Organization documenting various standards for cartridges, pressure and firearms. SAAMI applies to primarily U.S. based civilian firearms. http://www.saami.org/ [1] Links: ------ [1] http://www.saami.org/
This warning is from the Accurate Arms 2002 load guide. This is the text of the warning in full: SPECIAL WARNINGS!!! Concerning the internal dimensions and configurations of centerfire metallic calibers, especially semi-auto pistols. This warning ...
FEET PER SECOND TO MILES PER HOUR The quickest way to convert F.P.S. to M.P.H. is to divide the f.p.s. by three and then multiply that answer by two. The answer will be close enough for all practical purposes. ------------------------- MILE...
The overall length (o.a.l.) listed on the drawing in Modern Reloading is the SAAMI (Small Arms Ammunition Manufacturers Institute) specification. Most of the load data in the book was supplied to us by the powder manufactures. One can exceed the reco...
We do offer cowboy action loads in Modern Reloading. Look for the lower velocity loads near the end of the list for every bullet type and grain weight.
Dram is a common term used to indicate powder of shot shells. A dram is a unit of weight which is slightly larger than 27 grains. It was a standard measurement for black powder, but in recent times, powder is measured differently. Currently, there is...
The warning is from the Accurate Arms load guide. This is the text of the warning in full: This data is intended for use in firearms with barrels which fully support the cartridge in the chamber. Use of this data in firearms which do not fully su...
All of the maximum loads are supplied to us by the powder manufacturers. Some of the start charges are calculated from the maximum, based on the pressure that the maximum charge produces, compared to the maximum allowable pressure for the cartridge i...
View current list of VMD's here: http://www.leeprecision.com/cgi-data/instruct/VMD.pdf
How to read the Lee safety scale