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I don't think it matters - as long as you check for pressure signs while working up from a light load. I'd bet the short length rounds have less powder in them.

I personally load to 2.260" in a 1:8" RRA NM4 20" Wylde chamber AR.
 

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Discussion Starter #4
I'm working up this Load for the A2
[IMG=left]http://i32.photobucket.com/albums/d9/RWLambo/Gun%20Photos/RockRiverArmsNM.jpg[/IMG]
Looking for an accurate Load for the 52gr BTHP too!
Thank You!
 

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The A4 is what I have. Need the 53gr SMK flat bottom bullet, not the boat tails. Put 26.0gr TAC under it, CCI BR-4 primer. That's what I use at 200yds or less as long as it's not windy. If windy, I use 69gr SMK with 25.5 varget. Both loaded to 2.260" COAL.
 

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2.260 for the 69's for me with the wylde chamber.
I think the 2.260 came about as the max OAL for mag length but most people I know use it.

I also load my 68 hdy's to 2.260 which puts the cannelure out of the case. Groups are smaller than loading to "cannelure" length

My RR 1/8 also likes the 53 flat base better than the 52 boat tails
 
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