cherry are small indeed. In moulds having more than 197 one cavity (for same bullet) the bullets will often be of different weights. When bullets of different weights are fired they will not shoot with the same elevation, that is, the heavier ones will shoot a little higher than the light ones. The difference can not ordinarily be detected by ordinary shooting but the reloader who wishes to get the most uniform results should use bullets from one cavity; it doesn't matter which one.
As has been stated, when a mould does not perform properly, the best bet is to return it to the manufacturer for correction. There is not much that can be done with the old solid block moulds. If a cavity is slighdy burred, it may be possible to correct it if the present cherry is exacdy the same shape as the one with which the cavity was originally cut, but recherrying these old moulds is likely to ruin them. Moulds of this type in common use are mosdy Ideal moulds, made by the Ideal Manufacturing Co., by the Marlin Firearms Co., of New Haven, Conn., or by the Lyman Gun Sight Corp. when they first started making Ideal reloading tools. All the old fixtures for cherrying these moulds have been scrapped which makes recherrying them of uncertain outcome and the Lyman Co., will not do any work on these moulds except at the risk of the owner. Thus far they have been lucky, probably because they will not undertake such a job unless they are fairly sure that it can be done right.
The detachable mould blocks can be recherried at small expense either for the same bullet for which they were originally made or for a larger caliber bullet, provided the larger bullet is enough bigger, and longer so that the original cavity can be entirely eliminated. It is not possible to recut a mould for a different shape of bullet of the same or neady the same caliber.
It sometimes happens that a reloader is so situated that he cannot conveniendy return his mould to the factory and an attempt will be made to suggest simple ways in 198 which a cantankerous mould may be improved or a rusted or damaged one can be made serviceable. It should be understood that work of this kind had best be done by a skilled mechanic and the novice who tries it with poor results will have to take the responsibility, as no manufacturer will correct a mould that has been tampered with, without charge.
Venting. Probably the most troublesome condition in a new mould is the failure of bullets to fill out properly. Hollow point and hollow base moulds arc particular offenders, as the hollow point or base plugs cool more rapidly than the rest of the mould and have a tendency to cool the metal before it can flow into the narrow space left around these parts. Venting, hot metal and rapid casting will at least pardy overcome this trouble. Failure of any bullet to fill out is caused by failure of the air to escape from part of the mould before the metal solidifies. It may be due to the metal not being hot enough or to the two halves of the block fitting too closely together. Bullets with narrow bands are special offenders.
An old trick for correcting this, and one that has some
Leading Problems. The bullet on left is not well filled out. Its rounded edges would give a different degree of leading (if any) than the same bullet with sharp bands. Bullet on right has too large a nose for the barrel it was fired in. Such a long unlubricated bearing often causes leading.
Failures near the heads of factory loaded cartridges, These were caused by hidden defects in the brass. New cases are not a guaranty of safety when loading maximum loads nor even with loads of normal pressures.
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