Author: Olddust
Subject: Cast love finally
Posted: May 02 2022 at 12:34pm
Subject: Cast love finally
Posted: May 02 2022 at 12:34pm
 britrifles wrote:Excellent result! Lyman Cast Bullet Notebook 4th Ed. gives a max charge of 28.2 grains of IMR 4227 with a 180 grain bullet with a MV of 2132 fps. You should be able pump up the load some more and see how it groups, although the lighter bullet will travel faster, so will have to watch for bore leading. That will bring your rear sight down too. The recommended starting load is 20 grains with a 180 gr bullet (MV of 1616 fps). As another data point, my old Lyman 45th Ed. gives a starting load of 25 gr of IMR 4227 with MV of 2066 fps and max load of 28 gr with MV of 2217 fps for a 155 gr cast bullet with gas check (#2 Alloy). Be aware though that this is from a 1970 reloading manual and powder composition may have changed since that time. |
Yes I have a scan of the pages from both of those manuals. I only have 100m range to shoot at locally, and honestly Velocity is not a concern for these practice loads. I want economical practice with the rifle.
I used no filler in any of the tests
I recorded velocity of the 20gr load average @1627fps