Thread: Projectile annealing

Originally Posted by 300CALMAN

Is this a piss take?

Projectile annealing "info" aside -there is a far better on game performance gain with J4 jacketed projectiles in keeping the meplat diameter above 24 thou for reliable expansion, any smaller and "pencilling through" can occur with enough regularity to cause concern.

Use a whidden trimmer and pointer to improve BC and you will have very unreliable expansion on game with J4 jacketed projectiles.











Most if not all hunting projectiles have a decent meplat dia and when kept above 24 thou will give reliable terminal performance on game more so than annealing the projectiles nose forward of the ogive.

Earlier Berger projectiles often had meplat diameters smaller than 10 thou, their 180g 7mm projectiles occasionally surprised with their lack of terminal performance on game and that encouraged experimentation.

Plenty of SST/amax projectiles and bic biro pens lost their roller tips in the quest to have a large meplat hidden by a high BC tip, which worked but the early Berger projectiles are tedious to modify.

Kevin Cram from Montour County Rifles designed and marketed a set of tools to modify meplats on the earlier Berger type projectiles


This uniformed and trimmed not only the outside of the projectile tip but inside the meplat hole as well, restoring the on game performance to be as reliable as possible. So we can see the modification has been around and tested plenty.

There is a risk with annealing projectiles, -the negative effect of bonding the lead core with the jacket in an unreliable way, a spin stabilised projectile subjected to many rpm detests in flight yaw and wobble, major decayers of practical BC