6.5 CM 127 gr Barnes LRX - Am I over SAAMI specs?

[Midwest_Bowhunter83]

Alright... Here's what I'm working with.

Christensen Mesa Model 14 - 24" 1:8 twist barrel
Barnes LRX 127 gr
Hornady Brass
Remington 9.5M primers
42.8 grains H4350
Seated .050 off lands
ES 18 fps (recent 10 shot group)
SD 5.4 fps (same 10 shot group)
Avg velocity is 2892 fps

The rifle shoots a 1/3 MOA 4 shot group at 100 yards with this configuration. I am getting a very slight ejector mark on the brass, but no primer cratering and no sticky bolt when ejecting the case. Hodgdon's website has the max load at 42.3 grains with pressures at 60,400. By jumping up a half a grain, am I over the 62k that SAAMI lists as max? Knowing that the Barnes mono bullets require speed to function, I'm trying to keep the speed high out to 500 and 600 yards for antelope and deer. I REALLY do like this configuration, but don't want to break anything.

I appreciate everyone's input.

 

[streamerfish]

whats your OAL?

Your probably a little hot....but probably not catastrophically so.

 

[63-88]

What ambient temperature conditions did you work up the load with? If I were you I would make sure that load isn't popping primers or wrecking your brass when the temps get warm before you load up a couple hundred rounds.

You're probably OK as H4350 is pretty temperature in-sensitive but just something to consider.

I don't know if anyone is going to be able to tell you if you are over 62k PSI, but you are probably close to it. Bolt guns are pretty tough, I don't think you're going to wreck anything at that pressure but your brass might wear out a bit faster than with a lighter load.

 

[Midwest_Bowhunter83]

COAL should be very close to 2.778”. I am 2.195” to the ogive. I try to be right on that number considering that’s my jump into the rifling.

It was about 85 degrees when I first put this load together. This last time I shot, it was in the low 60s with mid 30% humidity.

I wasn’t sure if or how much over spec I’d be over pressure being a half grain over max by Hodgdon’s data.

 

[kota]

What bullet is the hodgdon data with? Barnes lists the max load at 40.4, and I have read the monos create higher pressures than cup/core. I would back off a little bit until the ejector marks disappear. I’m at 41.5 with essentially the same load since that was the balance point between pressure signs and accuracy in my rifle.

 

[Midwest_Bowhunter83]

What bullet is the hodgdon data with? Barnes lists the max load at 40.4, and I have read the monos create higher pressures than cup/core. I would back off a little bit until the ejector marks disappear. I’m at 41.5 with essentially the same load since that was the balance point between pressure signs and accuracy in my rifle.

Their load data was with the Barnes LRX.