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Joined: Oct 2002
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I can't win, for years everyone kept saying what a PIA it was to fireform brass and not worth the effort, now fireforming is the only way to go....


"Dear Lord, save me from Your followers"
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Steelhead,

I'm with you, for the life of me I cant stand why anybody is scared of fireforming. You get equal or better performance than the parent while doing it, all the while getting more trigger time on game or targets. Win/Win in my book

Joined: Feb 2002
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Consider this real world application:

22-243 IA

75s at 3650, easy, 8T(throated .060)

60g Sierra, Nosler, and hornady at 3900+(zero freebore reamer)

60g partitions destroy deer out of a 14T if you have a used BR barrel laying around.

Use std Redding 243 AI competition dies with bushings and/or RCBS 22-243 AI seater.

I fire form with 14.6g of Bullseye and cream of wheat, this is very, very easy to do. Or, you could work up a load, hunting with fire forming loads.

Use Lapua brass, but Winchester brass is giving me good service(5 reloads) once fired as 243 at that.

No feeding issues ever out of an unaltered Rem 700.

Joined: Aug 2002
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I have both 6 mm and 22 Creedmoors. I resize the once fired brass from the 6 mm (Hornady 6 mm brass) in a Redding FL die with a .254 bushing. I use a Hornady seating die I cobbled together after calling them and ordering different pieces and parts. I'm running it on an xray chassis with ASIC mags and haven't had a single issue with feeding.

What I've found so far is whatever works in the 6 mm works in the 22 within a .5 grain or so. I've used 4831SC, R26, MRP and Retumbo with both 75 AMAX and 77 TMK's. All three use roughly 45 grains of powder in either load. 47 grains of MRP fills the case to the top, 46 gets to the neck/shoulder and 45 is just below the shoulder.

The TMK's for whatever reason are a bit faster by about 50 fps. I get 3600 fps with the 77's and 46 grains of MRP in my 23" barrel. I've settled on 45 grains for 3545 fps.

With both rifles sighted at 100 yards, the 6 mm requires 29 clicks on my Nightforce mil scope at 600 yards with a 105 Hybrid at 3050 fps. The 22 requires only 19 clicks with the same scope. Both seem to buck the wind about the same but the 22 is flatter.

My gunsmith simply took a 6 mm Creedmoor case, necked it to 22 and sent it in to have a reamer built. Accuracy is fantastic.

I've already got a spare barrel figuring I'll burn it up quickly since I just shoot it and don't baby it. I'll probably set the new barrel at 19 or 20 inches. From what I've been able to find, an 18" barrel doesn't lose too much from a 22" barrel with the 22.

Last edited by parshal; 07/01/16.
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3,600fps with that case and bullet combo seems reasonable.




Dave


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What size groups are you getting with the 75 Amax, parshal?

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I only shot the AMAX long enough to determine that it was slow than the TMK so I've stayed with the TMK for now. During my load workup accuracy was similar to the TMK.

Here's a five shot group with a bad flyer but you get the idea of the accuracy potential. This was with 45.5 grains of MRP. I've since reduced it to 45 for simplicity since the RCBS loader is set up for that in the 6 Creed. That's at 3593 fps.

[Linked Image]

Last edited by parshal; 07/03/16.
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