JimGnitecki
Member
- Joined
- Mar 28, 2010
- Messages
- 1,258
Last evening I loaded up 50 cartridges:
25 of them with the BHN 15 alloy and .460" diameter bullets, and
25 of them with the BHN 15 alloy and .459" bullets
At my next range session, I will test a total of 3 different variants:
BHN 12.5 alloy with .460" diameter bullets
BHN 15 alloy with .460" diameter bullts
BHN 15 alloy with .459" diameter bullets
Note that:
My Pedersoli's barrel was slugged by the gunsmith as being .4563”
My Lee .460" sizing insert actually results in a bullet diameter that my digital Mitutoyo caliper, which displays a 4th decimal place only as either a "0" or a "5", consistently displays as .4595", which means that the actual sized diameter is slightly UNDER .460", and closer to .4595" than to .4600". So, the ".460" diameter bullets are actually at MOST .45974". So, the ".460" bullets are actually only at most .00344" larger than the barrel groove diameter.
Thus the .459" sized bullets, which the digital caliper displays as .4590" every time, are therefor only actually at most .45924". So, the ".459" diameter bullets are actually at most .00294" larger than the barrel groove diameter.
I do not have a .458" sizing insert to try.
IF the .459" sized bullets should prove to be more accurate, I will order a .458" sizing insert from Lee in The U.S. to try as well. (Not in stock anywhere in Canada that I could find).
By the way, the combination of the Brinell Hardness Calculator and a Rotometals "Super Hard" ingot made producing the BHN 15 alloy both reliably predictable and easy. SUCH an improvement over using wheel weights and other "mystery" materials.
Jim G
25 of them with the BHN 15 alloy and .460" diameter bullets, and
25 of them with the BHN 15 alloy and .459" bullets
At my next range session, I will test a total of 3 different variants:
BHN 12.5 alloy with .460" diameter bullets
BHN 15 alloy with .460" diameter bullts
BHN 15 alloy with .459" diameter bullets
Note that:
My Pedersoli's barrel was slugged by the gunsmith as being .4563”
My Lee .460" sizing insert actually results in a bullet diameter that my digital Mitutoyo caliper, which displays a 4th decimal place only as either a "0" or a "5", consistently displays as .4595", which means that the actual sized diameter is slightly UNDER .460", and closer to .4595" than to .4600". So, the ".460" diameter bullets are actually at MOST .45974". So, the ".460" bullets are actually only at most .00344" larger than the barrel groove diameter.
Thus the .459" sized bullets, which the digital caliper displays as .4590" every time, are therefor only actually at most .45924". So, the ".459" diameter bullets are actually at most .00294" larger than the barrel groove diameter.
I do not have a .458" sizing insert to try.
IF the .459" sized bullets should prove to be more accurate, I will order a .458" sizing insert from Lee in The U.S. to try as well. (Not in stock anywhere in Canada that I could find).
By the way, the combination of the Brinell Hardness Calculator and a Rotometals "Super Hard" ingot made producing the BHN 15 alloy both reliably predictable and easy. SUCH an improvement over using wheel weights and other "mystery" materials.
Jim G