SOS - Cannot find IMR 8208 XBR Anywhere for the "Onyx/Markm special"

[MWAG19919]

The milder the primer the better with extruded powders... at least for low SDs. If you're wanting to maximize velocities, Federal primers are the answer. Those Fed AR Match primers goosed our loads like 40-60 fps all else equal if I remember correctly.

How do CCI #41 primers do?

[mic2377]

Interesting...I'd like to try this load next time I have time to get to the range. Do you use Mil cases and some kind of SR-M primer?

Yep just standard LC/FC cases. No fancy case prep. The nice thing about this load is that it seems to work well in temp extremes. No flattened primers during long shot strings in the summer, runs well with suppressor, and also is hot enough to run in subzero temps.

I mostly run CCI-450 primers, but I have shot CCI-400's as well with no ill effects. They are available and reliable.

[Eurodriver]

Thanks to all the help and posts and offers of assistance.

I found a remote LGS that had exactly one pound in stock which is enough to get me through the next match (I only need 200 rounds) I will snag up an 8lb jug shortly.

It's the only load I've ever ran in my SPR, and I'm very happy with it. It shoots about 1/3 the size groups that factory Black Hills TMK loads run through the same gun on the same day with the same shooter at 600 yards. It really emphasizes why handloading is so beneficial.

[Vegas]

https://www.natchezss.com/imr-powder...der-8-lbs.html shows 28 in stock currently.

[kerplode]

Yep just standard LC/FC cases. No fancy case prep. The nice thing about this load is that it seems to work well in temp extremes. No flattened primers during long shot strings in the summer, runs well with suppressor, and also is hot enough to run in subzero temps.

I mostly run CCI-450 primers, but I have shot CCI-400's as well with no ill effects. They are available and reliable.

Thanks!

[markm]

How do CCI #41 primers do?

I've not tried them. I run CCI 400s for 62 gr HPBT which seem decent.

[markm]

I found a remote LGS that had exactly one pound in stock which is enough to get me through the next match (I only need 200 rounds) I will snag up an 8lb jug shortly.

Do you load a test batch with a new lot? I used to think that was pretentious B.S. But I've learned first hand with three different powders that lot swings can be huge.

[mic2377]

I also used to scoff at the thought of testing each powder lot... But now I think it is a good idea too, had some similar issues with Varget and H4895.

[markm]

I also used to scoff at the thought of testing each powder lot... But now I think it is a good idea too, had some similar issues with Varget and H4895.

On a hot load, it's critical. We were blowing primers out with XBR after a lot change.