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I've had some lots of Xbr top out at 27.4, so be watchful.
I was watching a vid on internal ballistics and they made an excellent point: velocity isn't free.
When you start to see similar MV to book loads, regardless of your powder charge, you need to stop b/c that's at max pressure. Pressure relates directly to MV (well, area under the curve but for a single powder, Press/MV)
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grayfox Wrote:I've had some lots of Xbr top out at 27.4, so be watchful.
I was watching a vid on internal ballistics and they made an excellent point: velocity isn't free.
When you start to see similar MV to book loads, regardless of your powder charge, you need to stop b/c that's at max pressure. Pressure relates directly to MV (well, area under the curve but for a single powder, Press/MV)
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grayfox Wrote:I've had some lots of Xbr top out at 27.4, so be watchful.
I was watching a vid on internal ballistics and they made an excellent point: velocity isn't free.
When you start to see similar MV to book loads, regardless of your powder charge, you need to stop b/c that's at max pressure. Pressure relates directly to MV (well, area under the curve but for a single powder, Press/MV)
Hmm... that could be why Hornady doesn't list data for it. Anyway, I can set up the labradar and take data.
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My favorite loads are 120 ELD 28.5 grains of A2520, 120 ELD 26.5 grains of Benchmark, 95 V-Max 29.5 grains of A2520 all CCI 450 primers COL 2.245"...
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Has anybody used STAball 6.5 in a Grendal, I have some would like place to start, I know it is a little slow buy I have a 22inch. bolt gun, might be worth a try.
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I think you will find STAball a bit slow for the Grendel others have. Use the custom search tool on here and you can find a few threads about it.
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DIANEB Wrote:My favorite loads are 120 ELD 28.5 grains of A2520, 120 ELD 26.5 grains of Benchmark, 95 V-Max 29.5 grains of A2520 all CCI 450 primers COL 2.245"...
Have you tried CFE223 or Ramshot TAC with the VMax ? I have those powders and 100 of the bullets. Looking for a starting place.
I also have 200 of the PPU Prvi 120 g BTHP I'd like to get going with.
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Serenitynow...below is a link to a Google custom search for this forum. Put in TAC and Vmax. There are some threads
https://cse.google.com/cse?cx=0163689474...cu1o&hl=en
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27.5gr TAC and 28gr Varget are my best loads for the 123gr SST. 2.245" C.O.L. CCI #41 primers. Either Starline or Hornady brass.
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My new hunting load is 29.9gr. of BL-C2 and 130gr. Sierra Gamechanger. in rifle I am on at 100yrds and one inch low at 200yrds both under 1 moa. The Gamechanger hits like a 2 ton truck and as deadly as any round I have ever hunted with in any caliber.
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100gr Barnes TTSX
2.26 Coal -no crimp
No 41 Primer
33gr CFE 223
Average 2685fps
20" barrel
.5 moa
By far the best i've done with these bullets tried various powders(h335,8208,RL15) and various seating depths. Many other combo's were terrible.
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10-22-2022, 11:13 PM
(This post was last modified: 10-22-2022, 11:29 PM by Harpoon1.)
BluteEhre Wrote:100gr Barnes TTSX
2.26 Coal -no crimp
No 41 Primer
33gr CFE 223
Average 2685fps
20" barrel
.5 moa
By far the best i've done with these bullets tried various powders(h335,8208,RL15) and various seating depths. Many other combo's were terrible.
The real question is, where did you find those bullets? Youre amongst friend! 
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Lol i have had them a while.
Looking to trade 2 boxes of the 120gr for 100's but thats not looking too good.
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Hollis Wrote:I saw that same data and slowly worked up to 28.7 and saw no problems. I had 29gr load on hand to try if only no pressure signs at 28.7. All looked good so I went ahead and shot it with no serious signs of overpressure. The primer was not as rounded, but not flat, and there was a very slight mark from the ejector on one of the rounds but not the other two. So, it looks good for me but I DO NOT RECOMMEND this load for anyone who doesn't take all precautions regarding safety in load development procedures.
I have 20" Group Buy barrel in semi-auto AR15 platform. My experience...after reading this thread, I proceeded to work up a load with H335 powder for one of my AR Grendels with 20 ss bbl; original new Lapua brass, Hornady 123gr SST, CCI 450 primer, 2.25 OAL, starting load: 27.5gr H335,#2: 27.8gr, #3: 28.1gr, #4: 28.4gr, #5: 28.7gr. The first shot with 28.4gr blew the 5rd mag apart and out of the rifle! The 27.5gr was the only load that functioned properly...the remaining loads did not pick up from the mag. although they seemed to fire ok, all 5 shot groups were under an inch.
The moral of this experience...NEVER USE OTHERS LOADS, ALWAYS use Published starting and MAX loads when working up a new load in a new firearm! (I have been reloading since 1968...THIS was my first experience with a blown stuck case.) ALWAYS USE PUBLISHED PRINTED LOADS WHEN WORKING UP NEW LOADS.
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I forgot to mentioned in my last post that all loads were measured and weighed to the tenth of oz. using Two electric scales!
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Quickdraw80 Wrote:I forgot to mentioned in my last post that all loads were measured and weighed to the tenth of oz. using Two electric scales!
Do you mean Grains rather Oz , should be grains .
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I agree there are "favorite" loads on this site that are definitely dangerous in some rifles.
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Oh yea, some of us like to run hot. That's why you always work up and never take load data at face value.
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Quickdraw80 Wrote:My experience...after reading this thread, I proceeded to work up a load with H335 powder for one of my AR Grendels with 20 ss bbl; original new Lapua brass, Hornady 123gr SST, CCI 450 primer, 2.25 OAL, starting load: 27.5gr H335,#2: 27.8gr, #3: 28.1gr, #4: 28.4gr, #5: 28.7gr. The first shot with 28.4gr blew the 5rd mag apart and out of the rifle! The 27.5gr was the only load that functioned properly...the remaining loads did not pick up from the mag. although they seemed to fire ok, all 5 shot groups were under an inch.
The moral of this experience...NEVER USE OTHERS LOADS, ALWAYS use Published starting and MAX loads when working up a new load in a new firearm! (I have been reloading since 1968...THIS was my first experience with a blown stuck case.) ALWAYS USE PUBLISHED PRINTED LOADS WHEN WORKING UP NEW LOADS.
I recently did a ladder with 120 Speers and H335. Loads were 27 to 28.8 grains in .2 grain increments. I stopped the test at 28.2 grains because of excessive pressure.
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This seems the right place to ask a question about fliers. My best load seems to be 27.8g AR w 120 eldm out of 16" Faxon barrel. I repeatedly put 4 bullets inside .75" at 100 yards but there is always one flier making it 1 1/4-1 3/8. It is not consistent which shot will be the flier (first, last etc) I have tried varying seating depths, lightly crimping and waving a chicken bone over the scale. I can't seem to shake off that flier. Is this uncommon? Do I need to move on?
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