jandbn
09-29-2009, 11:11 PM
I have some .452 325 gr LBT PB culled boolits I would like to let family members plink with. The boolits were dropped and most were dinged up. Unfortunately, I don’t cast as of yet. Otherwise the culls would get thrown back in the pot; Thus the culling.
The thought is to possibly use Trail Boss in reduced loads for the culled boolits in a Ruger 45 Colt Bisley 5 1/2”. I currently do not have any fast powder for reduced loads other than TB. (TB is for reduced 250 grain and under plinking loads in the Ruger for the family members.)
I can’t find any TB load data for heavy boolit 45 Colt loads on Hodgen’s website. The heaviest weight boolit published by Hodgen for the Colt with TB is 250 grains.
Edited to add picture: (See attached thumbnail for 250 gr 45 Colt load from Hodgen.)
However, Hodgen does publish load data for the 454 Casull and a 325 grain.
Edited to add picture: (See attached thumbnail for 325 gr 454 Casull load from Hodgen)
NOTE: Hodgen’s Colt data is PSI but the 454 is CUP.
PLEASE tell me if my thought process is way out in left field!!!! Would using the same % volume ratio of powder and air space in the 454 provide approximately the same peak pressure in a Colt? If this load scenario is plausible, the load should ONLY be used in a Ruger Blackhawk/Bisley as pressure may be over SAAMI spec for the 45 Colt!!
Using Lee Volume Measure Density (VMD) for Trail Boss of .2172 (http://www.leeprecision.com/cgi-data/instruct/VMD'S.pdf), I was able to calculate the % of powder and air volume in the 454 load and extrapolate the data to a Colt load. Below is data used for calculation. Note: case water volume and boolit case displacement volume and COL are examples ONLY.
454 CASULL
Case volume of water: 45.7 grains or 2.96 cc’s
Boolit Diameter: .452”
Boolit Weight: 325 grains
Boolit Length: .825”
Boolit Nose to Crimp: .390”
Seating Depth: .435”
COL: 1.773”
45 COLT
Case volume of water: 42.6 gr or 2.76 cc’s
Boolit Diameter: .452”
Boolit Weight: 325 grains
Boolit Length: .825”
Boolit Nose to Crimp: .390”
Seating Depth: .435”
COL: 1.675”
1 gram = 15.4324 grains or 1 grain = .06478 grams
1 gram water = 1 cc water
Lee Volume Density for Trail Boss = .2172
Lee’s VMD conversion is from cc to grains. Most calculations are metric because it is easier than going back and forth between metric and English measurements. (Excel was used for calculation in the table below in case you may be wondering about the lengthy numbers.)
After calculating powder volume % and air space volume % for the 454, the % was used to basically “reverse” calculate the powder and air space for the Colt. Powder and air space cc’s were calculated from the %’s based on the net cc of the case. (Sorry for the poor looking table below-I was originally in an Excel table but I couldn't get it formated correctly.:cry:)
Edited to add picture: (See attached thumbnail for conversion table.)
Provided pressure with the calculated Colt load approximates the 454 published data along with John Linebaugh publishing Ruger safe Colt loads up to 32,000 CUP (http://www.customsixguns.com/writings/dissolving_the_myth.htm (http://www.customsixguns.com/writings/dissolving_the_myth.htm)), and velocity provides for a stable boolit, are there any nay-sayers? Again, PLEASE tell me if my logic is flawed and explain where I went wrong!!!
Question: If the above calculated MIN load of 4.4 grains of TB for the Colt is somewhat accurate and produces the same pressure as in the 454, what is the consensus of a starting load of 4.0 grains and the heavy boolit?
The thought is to possibly use Trail Boss in reduced loads for the culled boolits in a Ruger 45 Colt Bisley 5 1/2”. I currently do not have any fast powder for reduced loads other than TB. (TB is for reduced 250 grain and under plinking loads in the Ruger for the family members.)
I can’t find any TB load data for heavy boolit 45 Colt loads on Hodgen’s website. The heaviest weight boolit published by Hodgen for the Colt with TB is 250 grains.
Edited to add picture: (See attached thumbnail for 250 gr 45 Colt load from Hodgen.)
However, Hodgen does publish load data for the 454 Casull and a 325 grain.
Edited to add picture: (See attached thumbnail for 325 gr 454 Casull load from Hodgen)
NOTE: Hodgen’s Colt data is PSI but the 454 is CUP.
PLEASE tell me if my thought process is way out in left field!!!! Would using the same % volume ratio of powder and air space in the 454 provide approximately the same peak pressure in a Colt? If this load scenario is plausible, the load should ONLY be used in a Ruger Blackhawk/Bisley as pressure may be over SAAMI spec for the 45 Colt!!
Using Lee Volume Measure Density (VMD) for Trail Boss of .2172 (http://www.leeprecision.com/cgi-data/instruct/VMD'S.pdf), I was able to calculate the % of powder and air volume in the 454 load and extrapolate the data to a Colt load. Below is data used for calculation. Note: case water volume and boolit case displacement volume and COL are examples ONLY.
454 CASULL
Case volume of water: 45.7 grains or 2.96 cc’s
Boolit Diameter: .452”
Boolit Weight: 325 grains
Boolit Length: .825”
Boolit Nose to Crimp: .390”
Seating Depth: .435”
COL: 1.773”
45 COLT
Case volume of water: 42.6 gr or 2.76 cc’s
Boolit Diameter: .452”
Boolit Weight: 325 grains
Boolit Length: .825”
Boolit Nose to Crimp: .390”
Seating Depth: .435”
COL: 1.675”
1 gram = 15.4324 grains or 1 grain = .06478 grams
1 gram water = 1 cc water
Lee Volume Density for Trail Boss = .2172
Lee’s VMD conversion is from cc to grains. Most calculations are metric because it is easier than going back and forth between metric and English measurements. (Excel was used for calculation in the table below in case you may be wondering about the lengthy numbers.)
After calculating powder volume % and air space volume % for the 454, the % was used to basically “reverse” calculate the powder and air space for the Colt. Powder and air space cc’s were calculated from the %’s based on the net cc of the case. (Sorry for the poor looking table below-I was originally in an Excel table but I couldn't get it formated correctly.:cry:)
Edited to add picture: (See attached thumbnail for conversion table.)
Provided pressure with the calculated Colt load approximates the 454 published data along with John Linebaugh publishing Ruger safe Colt loads up to 32,000 CUP (http://www.customsixguns.com/writings/dissolving_the_myth.htm (http://www.customsixguns.com/writings/dissolving_the_myth.htm)), and velocity provides for a stable boolit, are there any nay-sayers? Again, PLEASE tell me if my logic is flawed and explain where I went wrong!!!
Question: If the above calculated MIN load of 4.4 grains of TB for the Colt is somewhat accurate and produces the same pressure as in the 454, what is the consensus of a starting load of 4.0 grains and the heavy boolit?