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Rifles, Reloading, Optics, Equipment
Reloading
300 Blk 190 Grain SubX seating problem
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<blockquote data-quote="Okanogan" data-source="post: 2560325" data-attributes="member: 90397"><p>I haven't been crimping my 300 BO subs that I run in a 7 inch AR pistol and have not had any problems. Skipping the crimp might help with your issues and help with SD/ES. While I agree that measuring COAL probably isn't as accurate as using CBTO, I have not had any issues staying consistent enough with COAL to maintain good 50 yd accuracy with the pistol.</p><p>I have found that for 300 BO subs, the seating depth seems to make a significant difference to my ES/SDs. When I use CFE BLK, it is particularly noticeable and the powder seems to much prefer a compact load. I had a hard time achieving a compact subsonic load with CFE BLK and 190 Sub-X. The problem was that if I seated the bullet deep enough to be compact, the rounds were too short to feed consistently in the AR pistol. I switched to A1680 which seemed less sensitive to being compact and seated the bullets further out at COAL 2.085, which is right at the bottom of the cannular.</p><p>I agree with the previous comments that Starline brass is a decent choice for 300 BO. You'll need to get it from Powder Valley though as almost everyone seems out of stock or is charging higher. Starline's web site isn't even taking back order which they normally allow so you might not to wait too long if you want some. </p><p></p><p>If you are looking for a good subsonic round for targets, I have had good luck with Hornady 225 match bullets that make for a nice compact load with CFE BLK at 2.200 COAL.</p></blockquote><p></p>
[QUOTE="Okanogan, post: 2560325, member: 90397"] I haven't been crimping my 300 BO subs that I run in a 7 inch AR pistol and have not had any problems. Skipping the crimp might help with your issues and help with SD/ES. While I agree that measuring COAL probably isn't as accurate as using CBTO, I have not had any issues staying consistent enough with COAL to maintain good 50 yd accuracy with the pistol. I have found that for 300 BO subs, the seating depth seems to make a significant difference to my ES/SDs. When I use CFE BLK, it is particularly noticeable and the powder seems to much prefer a compact load. I had a hard time achieving a compact subsonic load with CFE BLK and 190 Sub-X. The problem was that if I seated the bullet deep enough to be compact, the rounds were too short to feed consistently in the AR pistol. I switched to A1680 which seemed less sensitive to being compact and seated the bullets further out at COAL 2.085, which is right at the bottom of the cannular. I agree with the previous comments that Starline brass is a decent choice for 300 BO. You'll need to get it from Powder Valley though as almost everyone seems out of stock or is charging higher. Starline's web site isn't even taking back order which they normally allow so you might not to wait too long if you want some. If you are looking for a good subsonic round for targets, I have had good luck with Hornady 225 match bullets that make for a nice compact load with CFE BLK at 2.200 COAL. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 Blk 190 Grain SubX seating problem
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