Coal too short
- Thread starter grantman
- Start date
RC20 said:
What method of mine are you referring to? I haven't mentioned one in this thread and I don't recall originating one. But if you are using one of the several frequently described methods that stick the bullet in the lands (perhaps you are referring to Mr. O'Heir's comment), push the case in with your fingers until the shoulder stops on the chamber shoulder, then gently push it out from the muzzle with a cleaning rod. That replaces all the force on the tip of the bullet instead of using extraction force on the rim, and as long as the case fits freely in the chamber, you will then get no change in bullet position.
Grantman,
Based on bullet length, it looks like about a 10% pressure increase should occur from your over-seating. With your powder, it's about a 1.2-1.3 grain decrease in charge. So the regime of starting loads I outlined earlier will cover it. It's just another reason always to start at the starting (bottom) charge in a load data table and work up. Ignore anyone who suggests starting in the middle. They are playing statistical roulette, meaning, a very high percentage of the time it works out, but there is a small percentage where it doesn't and they just assume what they are doing is reasonable because they, personally, haven't run into an exception yet (anecdotal evidence). I've run into loads three times now (once my own and twice that of others) where the bottom starting load in a load data table was already a high maximum in the gun it was tried in. Unusual, but it does occur, and an illustration of why anecdotal evidence is not to be relied on as proof of anything.
A reloader with shop skills could drill the primer pocket/flash hole out to a diameter that would accommodate a cleaning rod. When it comes to seating a bullet I suggest the reloader size the case first, I am the fan of 'all the bullet hold I can get' and I am the fan of starting off with the bullet off the lands.
After seating a bullet in the case I suggest the reloader install the case in the chamber, after the shoulder of the case contacts the shoulder of the chamber I suggest the reloade use a cleaning rod to seat the bullet into the lands until it stops. After the bullet contacts the lands remove the case (transfer case) from the chamber and install the case into a seating die and raise the ram.
After raising the ram adjust the seating die to the transfer case. After adjusting the die to the transfer 'ZERO' the height of the seating stem with a height gage.
After zeroing the reloader can adjust the seating stem by raising and or lowering the stem, Meaning if the reloader wants to adjust the bullet off the lands .030" all that is required to do is lower the stem .030" And
if he chooses to save time save the transfer or he can measure the height of the stem above the die if he understands 'ZERO'.F. Guffey