hornady factory headspace problem

[reloader12]

new to reloading,trying to reload .223 rounds for my ar 15 r.r ,.I am using rcbs sb t/c .223/ 5.56 dies and a lyman headspace gauge to measure my case after I resize them.All have been pushed back .002/.003 .And slide in the lyman gauge perfect.Now I try a hornady factory .223 v-max 55gn round and all 20 are oversize..005/.006.But my rifle shoots dime size at 100yds.with these.My reloads 1. groups???Using lc brass or pmc resizded,cci 400 primer,acc2230 powder and benchmark.same results.All brass is sized ,headspaced 1.450+-.001, trimmed to same size1.750 +-.001 and oal length the same +-.002..?????What gives

 

[918v]

What gives is you have just learned that powder voodoo trumps case prep. Google the combo and see what people are using in their ARs. Then pick a powder. You cannot get half minute accuracy with every powder, no matter how much you tune the load.

 

[flashhole]

Try a heavier bullet.

 

[BoilerUP]

Don't get caught up in the numbers, if it shoots and doesn't have too much pressure run with it.

As for your reloads...try Varget, 8208XBR, or the 55gr standby of H335.

 

[918v]

I think he meant Hornady factory ammo has .004" more headspace than his reloads, .006" vs .002".

 

[reloader12]

Thanks for all the help guys...the hornady rounds all (20) measure .005 to .006 past max length..Playing with powder amounts now to hopefuly find a good combo...