6.5 sst (sherman short tactical) arrived
- Thread starter elkaholic
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Maybe something really crazy like an auto.
In a bolt I wonder about rebarreling my trg-22. I had planned a 6 mm wildcat to keep the 473 bolt face but it could be opened up and the mags have a generous 2.98 coal. Certainly the accuracy would be there if I threw a bartlien 1:7.5 or ideally a 1:8.5 to 7.5 gain twist. Load the 150 sierras till the Berger's are out.
Thing is with the PRS vel limits its best to try and find a node that puts you around 3100 fps. It would be nice to work a combo with the high bc like the new 150s using h1000 and no more than a 28" barrel to hit a node + or minus 50 fps. Then its all the shooter. I'm hoping to get out west to a few this coming yr. Have to get my butt back in shape for it.
In a bolt I wonder about rebarreling my trg-22. I had planned a 6 mm wildcat to keep the 473 bolt face but it could be opened up and the mags have a generous 2.98 coal. Certainly the accuracy would be there if I threw a bartlien 1:7.5 or ideally a 1:8.5 to 7.5 gain twist. Load the 150 sierras till the Berger's are out.
Thing is with the PRS vel limits its best to try and find a node that puts you around 3100 fps. It would be nice to work a combo with the high bc like the new 150s using h1000 and no more than a 28" barrel to hit a node + or minus 50 fps. Then its all the shooter. I'm hoping to get out west to a few this coming yr. Have to get my butt back in shape for it.
elkaholic
Well-Known Member
This is a clients 6.5 SST PRS rifle with some field data: 147ELDM at 3005' (center target)
elkaholic
Well-Known Member
He said it measured
12"
codyadams
Well-Known Member
Lol that is the smallest 12" I have ever seen.....is that what ya tell the ladies too??? Ha ha ;-)
elkaholic
Well-Known Member
elkaholic
Well-Known Member
Here is some more food for thought. Originally, I set the sst up for the 147's at a coal of 2.8 to the lands. I have been running them up to 3105 with 56.8 grs of RL26. Recently a client loaded some 150 Sierra's and took some measurements for me. Because it is far more pointy, and has a shorter bearing surface, it actually fits very nicely in the case with the boat tail being all that is in the case with the bullet seated to the lands. The coal is only 2.899" and bto is 2.180. This should fit just fine in an Alpha mag, especially with a few thou jump. I don't have any data yet but I expect with the shorter bearing surface and less bullet in the case, it may well outrun the 147. I think about 3050' with that bullet should make a mighty good competion rifle! I think we need to start building some 7-7.5 twist sst's
codyadams
Well-Known Member
Yup, it will easily fit in an alpha mag, I run my loads in my .260 AI with the 147 at 2.930" with room to spare. You can get out to about 2.950" before any issues arrise
Rich,
I have spent a good bit of time reviewing the new pointy smks vs the top berger hybrids for caliber and cartidge. It seems if you set the throat for the bergers as long as you have room in the mag for the difference in neck length the same freebore works almost perfectly for the smks. There seems to be a very close correlated ratio. They can be seated to the same point into the case. I have tried it for those two 6mm wildcats we have talked about for a couple yrs now and same for the 6.5 and 7mm. I am thinking the newest yet to be release berger eols will be close as well.
For the 6mm a freebore setup for a .015-0.020 jump for the 105 hybrids also works well for the elds and smk. I think the same is true for the 6.5.
I have spent a good bit of time reviewing the new pointy smks vs the top berger hybrids for caliber and cartidge. It seems if you set the throat for the bergers as long as you have room in the mag for the difference in neck length the same freebore works almost perfectly for the smks. There seems to be a very close correlated ratio. They can be seated to the same point into the case. I have tried it for those two 6mm wildcats we have talked about for a couple yrs now and same for the 6.5 and 7mm. I am thinking the newest yet to be release berger eols will be close as well.
For the 6mm a freebore setup for a .015-0.020 jump for the 105 hybrids also works well for the elds and smk. I think the same is true for the 6.5.
elkaholic
Well-Known Member
Yes. You do end up with a longer coal.
elkaholic
Well-Known Member
Well the question arose on another thread about the throating on the SST so I took the new 150 SMK and checked it against the original short throat SST reamer. It turns out that with the sleek profile of the SMK, it is seated perfectly in the neck at just over 2.9" to the lands I have some loaded up with Retumbo to test this week in my 8 twist.
I had actually figured that out a few weeks ago (simulation only) but never posted anything on it as most seem to not use the newer long TMKs or I do not see much talk for whatever reason. I thought we had spoken about how the ELD and Bergers lined up very well with the same freebore so I got some measurements for the TMKs (what a PITA finding someone with good numbers) based on your cases OAL and neck length I worked the numbers and they seemed to work very well for all the bullets and getting proper jump to lands. The COAL you had always mentioned, of 2.8ish, to me and then looking at the various ACIS, Accurate, and a number of the internal like savage etc it seemed to work well with the numbers I got from the bullet specs as they were given to me.
I did try to explain it when the topic came up recently but....... I did not want to derail your thread...
I am happy it looks to work. The big thing is having enough twist. I know on the 6mm 110s when they tried half twist slower than recommended some got slight increase in vertical stringing that those with the full 7 twist did not get. At altitude that likely is not a issue though but here on the east coast its hard not to end up shooitg somewhere at sea level or close to it from time to time.
FYI I think the coal I came up with for that lot of bullets was 2.91 but as these are tipped I think it can varying that much lot to lot but it still works or should in terms of the mag limits.
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elkaholic
Well-Known Member
I am proud to announce the new partnership between Axial Precision and Sherman Wildcats. If you don't already know, they have a very unique action that proves out on paper. They just put this rifle together and shot these groups while fire forming. It seems to like the Berger's a bit! They plan on making the SST their mainstay for competition and some very deadly sheep rifles. With this kind of velocity and accuracy from a sub 22" barrel, what's not to like for a sheep hammer! Watch for us at the January sheep show in Reno.
