8208 xbr under 95 SST & 100 and 90 gr TGK

[Trashy]

Got to the range today with the following load ladders and the averages are listed below.  If anybody wants to see the complete chrono strings let me know and can send them to you or post them but they just take up alot of room.

A loads were 5 shot strings with IMR 8208 xbr powder, CCI 400 SR primers, hornady once fired cases FL sized with headspace set to 1.185" and trimmed to 1.475".  Both the 100 gr and 90 gr. Sierra TGK's were set to CBTO 1.530", neck tension was.003".

The 95 gr SST's were set at CBTO of 1.678"
23.0 gr, avg 2383, sd 10.8, es29
23.3 gr, avg 2412, sd3.1, es 7
23.6 gr, avg 2447, sd 13.3, es36
23.9 gr, avg 2465, sd 16.0, es 39
24.2 gr, avg 2517, sd 5.4, es13
24.5 gr, avg 2547, sd 7.7, es 17
24.8 gr, avg 2566, sd 15.8, es43
25.1 gr, avg 2584, sd 6.6, es 17

The 100 gr TGK's were set to CBTO 1.530"
23.6 gr, avg 2396, sd 22.4, es59
23.9 gr, avg 2449, sd 17.9, es 40
24.2 gr, avg 2475, sd 9.3, es 26
24.5 gr, avg 2494, sd 10.5, es 26
24.8 gr, avg 2516, sd 10.4, es 26
25.1 gr, avg 2550, sd 9.9, es 23
25.4 gr, avg 2574, sd 6.6, es 16
25.7 gr, avg 2570, sd 15.2, es 36

The 90 gr TGK's were set to CBTO 1.530"
23.9 gr, avg 2490, sd 23.9, es 53
24.2 gr, avg 2514, sd 27.5, es 72
24.5 gr, avg 2562, sd 7.3, es 20
24.8 gr, avg 2537, sd 13.9, es 33
25.1 gr, avg 2601, sd 11.5, es 29
25.4 gr, avg 2641, sd 15.3, es 36
25.7 gr, avg 2669, sd 13.9, es 32
26.0 gr, avg 2682, sd 8.0, es 19

At first glance it looks pretty predictable except the 24.5 and 24.8 grs with the 90 tgk, don't know what happened there.  Group wise the 100 gr tgk was the loser it stayed 2" or better all the way up the ladder.  There is more to be done to find the top velocity but with the 95 SST grouping fairly nice up the ladder I am going to put aside the TGK's for now and concentrate on the 95 grain SST's.

Look over the data and provide some feed back please, I am thinking that 2800+ with the 95 SST is doable but I am a dreamer!

95 gr SST pic
   

90 gr TGK pic
   

Trashy

[Lemonaid]

Nice looking groups! Did you notice if the one flier in each group corresponds to either the first round out of the mag or the last?
I just switched from CCI 400's to CCI 450's due to primer piercing in my PPC. I've noticed primer cratering with the 400's at the upper loads that makes me nervous using them.
If you run your finger tips across the primer indent and it's rough, might be time to switch.

[Trashy]

Yes sir I had various amounts of cratering today. It was very light on the low charge weights and became more pronounced going up the ladders. I was going to switch to cci 41’s for the next work up, using the 450’s might help my sd’s and es’s on the upper charge weights though.

I need someone to help me extrapolate these velocities into ballpark pressures so I can guesstimate where the ceiling is going to be. But definitely have to switch primers.

Trashy

[MoHops]

Usual disclaimer of working up loads but I would say you have more room to move the charge up. While it’s not exactly the same, in my 6 Grendel I am running the 90 TGK with 28.0 of 8208 and no pressure signs. Again, not recommending that load to start and work your way up but wanted to provide you with some feedback.

[Trashy]

Thanks Mo for the feedback. I have the next ladder ready to go, started with 25.4 grains 8208 (where I stopped on the last one) and went up to 28.1 grains in .3 grain increments with 5 rounds at each charge weight. If I get through the 28.1 grain charge I’m hope I’m in the 2800+ range, if I can get that 95 SST in the high 2800’s or low 2900’s with 1” or better accuracy with no pressure signs I’ll be done.

Trashy

[Dino11]

Thanks Mo for the feedback.  I have the next ladder ready to go, started with 25.4 grains 8208 (where I stopped on the last one) and went up to 28.1 grains in .3 grain increments with 5 rounds at each charge weight.  If I get through the 28.1 grain charge I’m hope I’m in the 2800+ range, if I can get that 95 SST in the high 2800’s or low 2900’s with 1” or better accuracy with no pressure signs I’ll be done.

Trashy

I picked up 200fps switching from 8208XBR to CFE223, Made me put it on the back of the shelf. My groups opened up a little, and were shooting a little lower than the factory 108's shot the same day. The reloads were 105 gn, maybe I was just having a bad day at the range. At a 100 yrd. this barrel was shooting cloverleafs, I was getting 1.5 groups with the 8208.

[Trashy]

I agree the cfe223 is the speedster but I have never had any luck getting very good accuracy out of it and it doesn’t shoot very clean. If the 8208 can’t get there velocity wise, I will try leverevolution next. LVR shows to be in the same velocity range as cfe223 but not as dense so I don’t know if I will get case fill before I there velocity wise. I’m not a fan of compressed loads. I’ll know more after I shoot the ladder I ready to go, those little 95 grain SST’s have been holding tight groups so far.

Trashy

[Dino11]

I will go look and see if I have any LVR, not sure if I do.

I'm going to load a ladder or two later today. May do a load with some 100's my son brought home a couple days ago. He needs to get his together soon, he has everything to get it done. His is going to be a 20" Faxon.

Might also play around with lead jump since I will have two rifles to compare, Their is a .020 difference between the two, Faxon's I have and the Odin. Also heard that Hornady is going to load the 108's to 2.200 as well. They told me these bullets like some jump.

Would really like to get my hands on some of the new ammo so I can dissect it to find out how much and what kind of powder is in them. These bullets are kind of long into the case. Are the 95's much shorter?

[grayfox]

Palmetto state armory. Better jump on it, the 105's. SG ammo had 60 boxes and they went fast.

[Dino11]

I really hate ordering ammo online, $90.00 for three boxes, and I have a feeling this is going to be some of the older stuff, maybe this is some of the ammo Hornady recalled to resize. I guess I will find out.

My last order for the 108's was only $197.00 with shipping and tax.

That was for 200 rounds.

This stuff needs to start hitting the shelves, but then again I reload.

[grayfox]

Yeah... and the brass too. Right now this is the only way to get brass.

[Dino11]

I was just on Midways site, brass was .72 a piece, butter off buying ammo and shooting it.

Then you have brass that has been fired in you gun. You still should be resizing your new brass, just don't have to clean it.

[Trashy]

Don’t have any 103 or 105 grainers but the 95 SST’s look to be 1.102. Powder Valley is the cheapest I have seen brass at .60 a piece if that is when Hornady starts shipping. I am also on several notification list just waiting like everybody else.

Trashy

[6mmNewB]

I was able to get some SST from American Reloading, a 1000... For 130 I think shipped . Trying to work up loads for them. I can't find any published data, but was using tac powder. Max at 29.5 grains. I think I'll try cfe223 and leverevolution next.

[grayfox]

95 sst, use the hornady data. Seating will be short but it is doable, about 2.160-180 IIRC depending on your chamber dimensions. Their data says 27.5 gr Tac max for a gas gun, 28.4 for bolt action. 29.5 is too hot for Tac.
You will det more MV with CFE or Lever that's for sure. Their loads top out at ~29.4-7.

[6mmNewB]

95 sst, use the hornady data.  Seating will be short but it is doable, about 2.160-180 IIRC depending on your chamber dimensions.  Their data says 27.5 gr Tac max for a gas gun, 28.4 for bolt action.  29.5 is too hot for Tac.
You will det more MV with CFE or Lever that's for sure.  Their loads top out at ~29.4-7.

Thanks for the info!