Resized Hornady .458 350gr Interlock Load Data

[TacoTaco]

All,

So I went ahead and made up some test loads using the 350gr Interlocks. Batch of 20 rnds using AA1680, loaded in sets of five with 38.0gr, 39.0gr, 40.0gr and 41.0gr in them. COAL was initially setup at 2.260. Now here's the rub....

After I dropped the powder and seated the bullet, I used the modified .45/70 die to give them a good solid crimp. After doing this, the COAL jumped up to 2.270. What gives? Was my crimp so excessive that I squeezed the bullet out further? (Like squishing a bannana in your fist?)

Brass history is 7X fired and annealed prior to this loading.

Has anybody ever come across this before?

[Hoot]

All,

So I went ahead and made up some test loads using the 350gr Interlocks. Batch of 20 rnds using AA1680, loaded in sets of five with 38.0gr, 39.0gr, 40.0gr and 41.0gr in them. COAL was initially setup at 2.260. Now here's the rub....

After I dropped the powder and seated the bullet, I used the modified .45/70 die to give them a good solid crimp. After doing this, the COAL jumped up to 2.270. What gives? Was my crimp so excessive that I squeezed the bullet out further? (Like squishing a bannana in your fist?)

Brass history is 7X fired and annealed prior to this loading.

Has anybody ever come across this before?

Yes, I have seen the COL change with all three crimp methods I've tried. As long as they fit in the magazine, I wouldn't sweat it. If you try the TNT method, you need to be careful as pre-loading the brass to a narrower diameter, squeezes them longer and you don't want to go beyond your particular chamber's max case length tolerance. Good news is they're not precisely 1.700. I've tested mine as long as 1.704 and got the impression it might have a mil or two to spare. It was clean though and that tolerance for longer might change if it's filthy.

Hoot

[TacoTaco]

Thanks Hoot. I tested them for fit in the Mag and there were no issues. I'll give them a try this weekend and report out the results.