What is the purpose of a gas check on a bullet?
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What is the purpose of a gas check on a bullet?
A gas check provides a thin layer of harder but still malleable metal on the base of the bullet that obturates to provide a seal and prevents the propellant gas leakage that causes gas cutting, and helps the bullet grip the rifling.
Does 45 70 need gas check?
You don’t need gas checks. Second thing, making 45-70 bullets go faster than 1600 or 1700 fps is a total waste of time.
What does hard cast bullet mean?
Hard cast bullets may contain some lead and be grey in color, but that is where the similarities stop. Hard cast bullets can be formulated of numerous alloy mixes (antimony, silver, tin, etc) containing some lead, but the alloys make the bullet much harder than pure lead.
What does bt mean in bullets?
boat tail
As with any full metal jacket bullet, the FMJ boat tail is fully (or mostly) encased in copper or another hard metal or material. Roughly resembling the shape of a boat, boat tails are named for their designed tapered rear when viewed from the side.
How hard should my cast bullets be?
Most hard cast bullets will have a Brinell hardness # of 11 to 30 and as such are several times harder than lead.
Do you have to lube cast bullets?
Cast bullets require lubrication to prevent leading. Bullet lube serves not only to lubricate the passage of the bullet down the bore but also to seal the propellant gases behind the base. One of the most important properties of this lubricant is that it must be able to flow to be most effective.
What does boattail mean in ammo?
Whereas a normal rifle bullet has straight sides that end in a flat base, a boat tail bullet has sides that taper inward toward the base. The “boat tail” name describes it well because it looks like the stern of a sailboat. That shape benefits a bullet in the same way that it does a boat: by reducing drag.
What does bt mean on ammo?
Another acronym that you may not know, but one that you’ll see often is “BT,” for Boat Tail. It’s often on the ammo box as “FMJ-BT” or “FMJBT”.
