Bullet Seating Depth
- Thread starter 22Charlie
- Start date
I like to put a bullet into a fired case with the neck pinched just enough to snugly hold the bullet. The idea is to leave the bullet way out & let the rifling push it back into the case. If you carefully remove it & measure it several times it will give you the measurement to the rifling with that particular bullet. You can then minus the amount of bullet jump you want.
- Location
- Somewhere on the Hudson Bay Coast
I follow a similar technique. I chamber a round with a flat based bullet seated backwards in the case to determine the lead length. I keep this round for future reference. Next I take the bullet I intend to load, push it into the muzzle of the rifle and with firm pressure, give it a twist to score a line at the ogive. Now that I know the length of the lead and the length from the base of the bullet to the ogive, I can easily determine the proper seating depth of the bullet relative to the lead. In big game rifles I limit the COL to the magazine length, allowing enough play for reliable feeding.
that is one of the simplest idea's I have heard --should do the job rather nicely
mike shickele
Regular
buy yourself what is called a bullet comparator form Sinclairs, start out about a thousands off of the lead, and move out about 2 thousands at a time, giving yourself about 2 groups at each step. You should be able to see a point at which the groups become tighter. Once you have your depthfor that gun, mark it down and use it as a start for all different bullets, and different lots of the same bullets. Different lots of the same bullet can have markedly different ogives, so I check my length with the comparator every time I change lots of bullets (at least).
Mike
Mike
Bingo.
I have a Sinclair Seating Depth tool and i can tell you that this method is accutate to exactly the same degree as the Sinclair tool - and measured to the thousandsth of an inch! Bearing in mind this measurement reflects "first land contact" and is not an accurate reflection of being "into the lands"
The bytch with the 204 is the fact that the factory throat is generally so long, short bullets like the 32's never touch the rifling. The 32's are a flat base too, so chamfering the case mouth helps.
