8208XBR and temperature sensitivity?

[jwfuhrman]

8202 XBR is THE go to powder for 223 IMO, I have found I can use CCI BR4, Fed SR, Fed GM SR, Wolf SR, Wolf SRM and it just shoots great with any of them. I use it for 55's, 75's and 77's.

[markm]

I use it for 55's, 75's and 77's.

That's the beauty of XBR. I've shot 1/2 moa with 77s and 55 gr silvertips. We still shoot mostly H322, but I could live happily with only XBR.

[m4fun]

Ditto to jwfurman and markm - lots of XBR made here for both 75gr and 55gr. I had settled on TAC before the drought hit, but was able to pick up 20lbs in 1lb containers of XBR - since going through that and another couple of 8lb jugs, no issues.

[Malig8r]

I picked up two 8 pound containers of it earlier this month but haven't had a chance to test it out. Glad to hear it passes the markm test.

[markm]

The only downside to XBR is that you can't achieve high velocities with heavy bullets. Those who are fixated on getting the highest possible velocities out of 77s, for example, should run a slower burning ball powder. XBR is rooted in Benchrest. I'll give up 30-50 fps all day long for the accuracy I get from XBR.

[jpipes]

The only downside to XBR is that you can't achieve high velocities with heavy bullets. Those who are fixated on getting the highest possible velocities out of 77s, for example, should run a slower burning ball powder. XBR is rooted in Benchrest. I'll give up 30-50 fps all day long for the accuracy I get from XBR.

I have to say that I my experience is quite different with heavy bullets and 8208. I run 8208 with 82 bergers out of a 7 twist bolt gun at 2900 with no pressure. I've found that 8208 is THE go to powder for .223 with heavy bullets. I can't get that velocity with Varget without running out of room, and h4895 netted me velocity, but not the accuracy that I wanted. TAC was similar.

[markm]

I have to say that I my experience is quite different with heavy bullets and 8208. I run 8208 with 82 bergers out of a 7 twist bolt gun at 2900 with no pressure.

Are those loaded long? Loading long completely changes the characteristics of the load. I've loaded 80 gr SMKs a little bit, and that increased case capacity from loading the rounds with a really long OAL changes things up. It's pretty interesting.

[Gunnar da Wolf]

I found that 77gr Nosler / 23.2gr XBR worked best in my three most commonly used rifles and built a couple hundred. Now we'll see how it works in July - September.

Has anyone found much if any lot to lot variation with XBR?

[markm]

Has anyone found much if any lot to lot variation with XBR?

I had an unexplained batch of blown primers using the exact same charge weight, but a different lot. I can't pin it on Lot variation with certainty. But I pulled bullets and the charge weight checked out.

(FYI it was at 23.8 gr with 77s... I've since decreased the charge to 23.4 and haven't had any issues.)

[mattiep321]

Took Mark M's advice with regard to 8208 XBR last summer ... with my Douglas 18" 1:7, I'm getting 10 shots in roughly a nickel-sized group at 100 yards with 23.4gr of 8208 XBR in LC Brass trimmed to 1.750", loaded to 2.262" OAL. Absolutley love this stuff!