How to Slug a Barrel ... Good Read

[john boy]

http://yarchive.net/gun/barrel/barrel_slugging.html
Kind of tough doing it this way, but making the slugs and then running them from the muzzle would work.

Other folks use soft lead bank sinkers

I use a micrometer to measure the groove and a set of certified plug gauges from ENCO to measure the bore
http://www.carrlane.com/Catalog/index.cfm/27825071F0B221118070C1C513E111D081B0006280B1713050245221E0107070F1A3C3B285356475B

[litl rooster]

thanks john boy

[Dick Dastardly]

Thanks JB,

I printed the slugging piece and will keep it for reference.  Our Cowboy guns have to start the slug at the other end as you observed.  There's also a LOT of good stuff on that site when you click 'Home'.  I intend to bookmark that URL.

DD-DLoS

[john boy]

I intend to bookmark that URL.

Dick, I believe the moral of the story is ... We believe our own little world - CAS or BPCR or Lead Bullets, etc is the extent of the Universe.  It's not.  I have found much valuable information on hi-power websites that are 100% applicable to 'our own little universes'

Another point is:  We are always trying to re-invent the wheel... ie, no one has done it before.  Wrong Grasshoppers!
I have found much information by reading articles and books written from the 1860's to 1930's on ballistics and powder.
Example:  We develop trajectory tables the 'empirical way' ... go to the range with a chrono and shoot at targets - many times and usually incorrectly because the bullet needs to be shot over 2 known distances to develop a ballistic coefficient!

One of the most critical factors of a trajectory table for a given bullet is it's ballistics coefficient (BC).  Bullet form which is the caliber or 'i' value in the BC equation can be derived from a 1926 writing: Exterior Ballistics Charts by Wallace Coxe and Edgar Beuless, EI DuPont Ballistics Engineers.

This is my latest reading!

[litl rooster]

Thanks again, I can't believe this was back in July, unlike the Wise one DD, I forgot to bookmark it.   After searching it out I did.

Maybe we could talk the moderator into moving this to the Dark Arts...to be saved for others who may need it in the future

[john boy]

Rooster, since that post in July, in a lazy manner  , I have put together a spreadsheet for all my firearms: bore - groove and revolver cylinder throats.  The chart comes in handy when I am making recipes for specific firearms, especially BPCR.

I lucked out on my plug gage set.  It was on sale at ENCO for 70 bucks.

Other uses for a plug gage set:
* Drop a plug from both ends of the bore ... does it or not have a tapered bore?
* Calibrate one's calipers (yes they are usually off by 0.001
* Exact front sight measurements:  X plug in bore - measure from bottom of plug to top of front sight. Then subtract 1/2 the diameter of the plug.  You have the exact distance from the middle of the bore to the top of the sight
* Fiddling inside a gun and need the diameter of a pin hole?  Gotta have the real small plugs to do this
* For BPCR loads ... need the ID of a case so one can use a neck expander plug to give 0.001 or 0.002 neck tension?
Be creative, am sure I missed other uses for a plug gage set