06-04-2022, 02:24 AM
So Im going to preface this with Im trying to use up components that I have the fewest of so thats how I started this.
I have 200ct 85gr sierra hp fb bullets, and some lapua brass, Tula small rifle primers and some older accurate 2520. I look in the western powders loading manual and lucky me 2520 is the fastest powder with that bullet that I have currently. However they list 33.9gr of powder as the max, WOW.
My rifle is a cz 527 with the 16 threaded barrel, I just got a wood stock to replace the factory plasticy houge junk, which is why Im doing new load development.
Started at 32.5gr and two seating depths 2.18 and 2.13
Everything has been Lee factory crimped
32.5gr a2520 lapua brass Tula small rifle primers
2.13 oal 2730fps
32.5gr a2520
2.18oal. 2770fps This is odd because its into the lands but sped up
Everything else is 2.182 oal
33gr a2520
2.182oal. 2800fps
33.5 a2520
2.182oal. 2815fps but first shot was 2870 other two were 2811 and 2817
33.9 a2520
2.182 2840fps
34.1 a2520
2.182oal. 2850 best group (.27 @100yds) but its full to the top of the neck and crunch a bullet down. This is over book max but 33.9 (book max) isnt much lower from the very top. Super weird but kinda cool, going to verify
All loads were under and inch but as I sped up the groups tightened
I have 200ct 85gr sierra hp fb bullets, and some lapua brass, Tula small rifle primers and some older accurate 2520. I look in the western powders loading manual and lucky me 2520 is the fastest powder with that bullet that I have currently. However they list 33.9gr of powder as the max, WOW.
My rifle is a cz 527 with the 16 threaded barrel, I just got a wood stock to replace the factory plasticy houge junk, which is why Im doing new load development.
Started at 32.5gr and two seating depths 2.18 and 2.13
Everything has been Lee factory crimped
32.5gr a2520 lapua brass Tula small rifle primers
2.13 oal 2730fps
32.5gr a2520
2.18oal. 2770fps This is odd because its into the lands but sped up
Everything else is 2.182 oal
33gr a2520
2.182oal. 2800fps
33.5 a2520
2.182oal. 2815fps but first shot was 2870 other two were 2811 and 2817
33.9 a2520
2.182 2840fps
34.1 a2520
2.182oal. 2850 best group (.27 @100yds) but its full to the top of the neck and crunch a bullet down. This is over book max but 33.9 (book max) isnt much lower from the very top. Super weird but kinda cool, going to verify
All loads were under and inch but as I sped up the groups tightened