I bought 115gr JHP bullets from Precision Delta and I have to figure out what the COL should be. I have Hornady 115gr XTP on hand and they are 0.541" long. The PD bullets are 0.551" long.
The 50th Lyman recipe for the XTP calls for a COL of 1.090". But Lyman also shows a Barnes TAC-XP 115gr having a COL of 1.100."
Hodgdon data shows a 115gr Speer Gold Dot HP COL as 1.125" with Hodgdon powder but with Alliant they list a 115gr FMJ, no manufacturer COL as 1.120."
Hodgdon also lists the following COLs for a 147gr Hornady XTP:
with Hodgdon powder, 1.100"; with Alliant, 1.140"; with IMR 1.130"- all with 4" barrels? In fact, reviewing bullets weights from 90gr to 147gr there is no agreement among Lyman, Hodgdon, or Speer data.
Speer lists a COL of 1.125" for their 115gr Gold Dot HP; 1.135" for their 115gr TMJ and 1.125" for their 115gr JHP.
How does one figure out what the seating depth and COL length should be for a generic JHP-HP?
The 50th Lyman recipe for the XTP calls for a COL of 1.090". But Lyman also shows a Barnes TAC-XP 115gr having a COL of 1.100."
Hodgdon data shows a 115gr Speer Gold Dot HP COL as 1.125" with Hodgdon powder but with Alliant they list a 115gr FMJ, no manufacturer COL as 1.120."
Hodgdon also lists the following COLs for a 147gr Hornady XTP:
with Hodgdon powder, 1.100"; with Alliant, 1.140"; with IMR 1.130"- all with 4" barrels? In fact, reviewing bullets weights from 90gr to 147gr there is no agreement among Lyman, Hodgdon, or Speer data.
Speer lists a COL of 1.125" for their 115gr Gold Dot HP; 1.135" for their 115gr TMJ and 1.125" for their 115gr JHP.
How does one figure out what the seating depth and COL length should be for a generic JHP-HP?