That does look promising. Is the Roto158-190F alloy the best for this purpose -- where best is defined as providing the most precise, constant-density, void-filling casting, as well as the ease of...
Type: Posts; User: dbooksta
Forum: Gunsmithing Tips & Tricks
That does look promising. Is the Roto158-190F alloy the best for this purpose -- where best is defined as providing the most precise, constant-density, void-filling casting, as well as the ease of...
Forum: Gunsmithing Tips & Tricks
Water has surface tension, which can trap tiny bubbles. Could get around that by using a surfactant, but then there's still the problem of how to plug the barrels to a precise point.
So far Pb2au...
Forum: Gunsmithing Tips & Tricks
Very clever! Should probably use cutting fluid or some other non-wetting fluid to avoid the problems associated with surface tension, like tiny air bubbles inside the bore.
Forum: Gunsmithing Tips & Tricks
Good ideas on the fluid! In this case I need to be able to plug the bore at a very precise depth.
So let's assuming I'm going to be measuring water-soluble cutting fluid into the muzzle. What...
Forum: Classics & Stickies
FYI, new URL for the referenced video: https://www.youtube.com/watch?v=ErFaJlUVs1Y
Forum: Gunsmithing Tips & Tricks
I don't think the temperature variations in my workroom are a problem.
I guess I could try to use a ball slug and see if I can calculate a difference with a micrometer based on the land diameter,...
Forum: Gunsmithing Tips & Tricks
From a traditional ball slug I don't believe I can measure groove width and depth to enough precision. These are all 5-land .308 barrels. I am expecting cross section variance to be third order at...
Forum: Gunsmithing Tips & Tricks
In order to test a hypothesis I need to very precisely determine the (relative) volume/length of a few .30" barrels. The barrels are a mix of stainless, 4140, and nitrided 4140 steels.
The best...
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |