resizing 6.5 grendel to .243 LBC

[cjgemm]

Above was calculated with the Nosler 100gn part. loaded at 2.195. I have found QL to be sometimes inaccurate(didnt do a very good job with my 284win) , but still find it a useful tool. Just thought I'd pass the info on. From what Ive read mid 2700 should be a realistic number for a 105 out of a 26" barrel.

[The Wolverine]

Well, a three shot string with 28.5gr of 8208 the 100gr Partition is running 2803, 2789, and 2813fps, with no pressure signs at all, primer not even starting to flatten, so your speed to powder numbers are not too far off, but I do not think I am running anywhere near the pressures you are showing.

BTW, I believe my next build will be a 20'' Grendel, so I am not trying to say the 243LBC is a replacement for the Grendel, more like a compliment to it.

Paul

[JASmith]

Hodgdon shows just under 2750 with 100 gr Ballistic Tip with pressures at almost 50000 psi. You are not likely to see pressure signs until you get closer to 57000 psi.

Going above 50ksi is likely reduced bolt life...and the reason Bill Alexander specified a SAAMI pressure limit that keeps working pressure under that.

[Drifter]

Forgive my ignorance, but would it be possible to form 243 LBC brass using a 6.5 Grendel full-length S-type bushing die, and changing the expander to 6mm and using a smaller appropriately sized neck bushing?

First time through might be tight, but after fire-forming, it should be easier.

Possibility, or not even close...?

[bwaites]

Forgive my ignorance, but would it be possible to form 243 LBC brass using a 6.5 Grendel full-length S-type bushing die, and changing the expander to 6mm and using a smaller appropriately sized neck bushing?

First time through might be tight, but after fire-forming, it should be easier.

Possibility, or not even close...?

It should be possible using bushing dies, though I'd probably step it at least once, and maybe twice instead of trying to do it in one leap.