300BlkTalk

I ran 3 more across the chrony and got 1052, 1040 1046.

Btw I use cci 400 primers. Still at 9.7 grains 8.3 barrel, got lock back on the last round. I have drilled the gas port out to .109 iirc.

I had it at the rage last week no issues with super ammo.

Ben try 9.7 grains of the 4227, Its giving me around 1080 or so on my 8.2 barrel. 10 is running close to 1200

i use a beam scale, and check it with an electronic. The beam scale is always more accurate, but I dont have a super expensive electronic one.

I like the beam scale as I can see what its doing as i add powder.

Okay follow, and why use work down and use a chrony. 10 grains of 4227 is 1116 fps, extreme spread was 3, two where the same fps 9.7 grains was 1018-1021. Its funny how 10.5 grains was 1160, 10 grains was 1116 or a little over 40 fps then 9.7 was 1018 so a .3 grain was 100 fps. Load length for those...

Ok first I did drill the gas port out to .102 and it did not lock back. Bumped it up to .107 I get full cycle but not lock back. Gun is dry I need to lube it that may make a difference also the temp is low 30s. Gun is a 8.3 I think a cmmg barrel factory port was right under .1 So at 10.5 velocity is...

I should be getting 300 sub x bullets in the mail today and I need to work up some loads. I have h110, and 4227 on hand and will start with 4227 as its what I load 95% of my 300blk with. My current barrel on my 300 is an 8.3 iirc, it does not cycle fully with the loads that work in my 10.5 barrel. I...