I am trying to work up a load approximating factory hunting loads using Alliant 2400 with a 240gr Laser-cast SWC
or XTP. I'm starting with the SWC's 'cause they're cheaper. I'm shooting a 6.5" model 629, using Starline cases and WLP primers.
Last week, I took the following data:
Code:
gr fps sd
12 890 53
13 938 21
14 1068 30
15 1134 5.5
16 1172 22
17 1236 28
Since that didn't really get fast enough, I did the following today:
Code:
gr fps sd
17.0 1205 27
17.5 1216 20
18.0 1218 22
18.5 1235 19
19.0 1280 19
19.5 1304 24
What's up with that? When I extrapolated from the first set of data, 18gr should have yielded a velocity of around 1300fps, but you can see the second set of data is requiring more additional powder for the same velocity increment vs. the first set of data. I am also somewhat confused because some of my loading manuals list MAX for this load around 22, and some list it around 19-19.8. Some of the books I have say that 19gr should be much faster than 1300fps.
Do these numbers seem in-line with your data for this load?
The primers are still rounded, and these loads don't "feel" very hot. Is the answer to keep going?
Does anyone else have a recipe for this type of load?
thanks
Zak