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- Dec 24, 2009
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I finally got my cast 260gr .406 bullets resized to .401 and decided to up the powder charge to 105gr-110gr and used the modded CVA breach plug with Lehigh liner.
I was able to get the Lehigh 200gr DOA to stabilize but it needed 110gr of BH209 for good accuracy and the primers were beginning to show signs of high pressure. The same 110gr charge with my 260gr cast bullets were also showing some slight pressure signs on the primers.
The MMP tan 40/45 sabots worked best with the charges over 100gr. A few of the Harvester smooths were in pretty bad shape when the charge reached 110gr. Both were fine with 200gr or less bullets.
I did get 2 key holes with 90gr of BH209 with the Lehigh 200 DOA and 1 key hole on my WinApex using the 260gr and a 40/50 Crushrib with the same lighter charge.
I shot my best 200 yard group ever with the Lehigh 185gr DOA, 4 shots inder 2". 3 went under an inch on my best group. My best group with my 260gr cast was just over 2" for 3 shots and opened upto abut 3" with 4 shots.
I wasnt allowing enough time for barrel cool down either with the 260gr cast RNFP. I took my time with the 185gr Lehighs. We got upto 60F today
BTW the real surprise today (after bad reviews) was the 475/50 Harvester sabots and the Hornady .475 325gr XTP. I kept throwing a flyer on one shot but 2 were almost always touching. My WinApex with the modded BP really liked 100gr of BH209 and this bullet/sabot.
My very hard cast 200gr .429 spire points are showing some nice potential with some load development and cut really nice holes. I only tried them with 100gr of BH209 and the Harvester Green Crushribs. 3 shot groups were under 2" and a joy to shoot.
I will post some pics after i take a pain killer and get a shower. I am reallly sore atm. I burned a bit over a pound of powder total for 3 guns in roughly 3+ hours.
I was able to get the Lehigh 200gr DOA to stabilize but it needed 110gr of BH209 for good accuracy and the primers were beginning to show signs of high pressure. The same 110gr charge with my 260gr cast bullets were also showing some slight pressure signs on the primers.
The MMP tan 40/45 sabots worked best with the charges over 100gr. A few of the Harvester smooths were in pretty bad shape when the charge reached 110gr. Both were fine with 200gr or less bullets.
I did get 2 key holes with 90gr of BH209 with the Lehigh 200 DOA and 1 key hole on my WinApex using the 260gr and a 40/50 Crushrib with the same lighter charge.
I shot my best 200 yard group ever with the Lehigh 185gr DOA, 4 shots inder 2". 3 went under an inch on my best group. My best group with my 260gr cast was just over 2" for 3 shots and opened upto abut 3" with 4 shots.
I wasnt allowing enough time for barrel cool down either with the 260gr cast RNFP. I took my time with the 185gr Lehighs. We got upto 60F today
BTW the real surprise today (after bad reviews) was the 475/50 Harvester sabots and the Hornady .475 325gr XTP. I kept throwing a flyer on one shot but 2 were almost always touching. My WinApex with the modded BP really liked 100gr of BH209 and this bullet/sabot.
My very hard cast 200gr .429 spire points are showing some nice potential with some load development and cut really nice holes. I only tried them with 100gr of BH209 and the Harvester Green Crushribs. 3 shot groups were under 2" and a joy to shoot.
I will post some pics after i take a pain killer and get a shower. I am reallly sore atm. I burned a bit over a pound of powder total for 3 guns in roughly 3+ hours.