This R&D done @ 2 years ago to the month & originally shared on the GTA forum.
Pending caliber of slug, depth & diameter of HP cavity a different size Phillips or Pozi-drive tip will give the best results.
* The tips used in doing this were thinned slightly to give cleaner scoring lines, tho not required pending tip used.
If wanting the back story .. here: HP slug modification
To show you what is the results of some testing ... here a few pictures of .177 NSA 12.5g as well .22 NSA 20.2 & 24.8g
Thought the AGN membership may find this of interest if a pester and using less costly NSA etc slugs.
Scott S
Pending caliber of slug, depth & diameter of HP cavity a different size Phillips or Pozi-drive tip will give the best results.
* The tips used in doing this were thinned slightly to give cleaner scoring lines, tho not required pending tip used.
If wanting the back story .. here: HP slug modification
To show you what is the results of some testing ... here a few pictures of .177 NSA 12.5g as well .22 NSA 20.2 & 24.8g
Thought the AGN membership may find this of interest if a pester and using less costly NSA etc slugs.
Scott S