hey guys i have been loading some 5.56 rounds for my lwrc m6a2 and i am not too happy with the accuracy. I was wondering what OAL you guys are loading to so i can compare my loads, i am loading to a OAL of 2.245

also what are you trimming your brass to?

Depends on bullet weight. For 55gr fmj I use 2.24

SAAMI Specs OAL 2.125 - 2.260; Trim Length 1.730 - 1.760.

 

I like trim length to 1.745 and OAL of 2.22 for 55's. A lot depends on the lead of your barrel, bullet length, and powder burn rate. If using 55FMJs, do they have a cannelure and how are you crimping them? Whose heads? A lot of factors here to mess with. Try 1.750 trim length to start. After that need more info about load to review.

55 grains I usually do to 2.220" with proper length brass. 2.245 sounds like a 75-77 grain BT length.

As far as trim length it can be deceiving. There are two dimensions to consider. Datum line to case mouth and datum line to case head.

 

That's why a gauge like this is essential... http://www.lewilson.com/casegage.html

 

As far as for in an AR C.O.L. if it fits in the magazine you're generally good to go.

 

But yes, you should use published dimensions.

im trimming to 1.740 and there is a little bit of the cannelure showing when i seat the bullet

that's ok.

I use 2.260" for my 65 and 69's but they're very cozy in the magazine.

 

I accidentally did some at 2.240" and rather than pull 'em I just shot 'em and there wasn't a big difference in accuracy.

Loading armscor 55FMJs? Accuracy is not one of their specialties. With a 1:7 twist your barrel and 55FMJs maybe having a little disagreement. Try 62's or even a box of Sierra MK 69's, see if that makes a difference. Takes time to find the right combination. My 24" SS BB 1:8 Wydle took a while to find the sweet spot.

ty guys ill maybe get some heavier bullets