Canadian Bushman
Well-Known Member
Wow. Really impressive considering the capacity. Im curious to hear about what it does with some other powders and how easy the cartridge responds to tuning.
7 mm SHERMAN SHORTMAG vs 7 SAUM
- Thread starter elkaholic
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gillettehunter
Well-Known Member
Great start. Bruce
bigd 7378
Well-Known Member
Rich,
Not trying to bash!! But how can the 7 SS get these velocities with 168 bullet?
I understand that it is more efficient case, but this just boggles my mind.
This is faster than 28 Nosler 7mm STW and 7mm RUM. This 7SS Really sparks my
Interest. I shoot a 7WSM.....do you think these velocities are possible with the 7 WSM?
I've only been able to get up to 3080 with my 7WSM burning Norma 217 and RL 33.
I've been looking for RL26 and IMR 7977 to try. Keep up the work and keep us updated.
Again I'm not trying to bash
Not trying to bash!! But how can the 7 SS get these velocities with 168 bullet?
I understand that it is more efficient case, but this just boggles my mind.
This is faster than 28 Nosler 7mm STW and 7mm RUM. This 7SS Really sparks my
Interest. I shoot a 7WSM.....do you think these velocities are possible with the 7 WSM?
I've only been able to get up to 3080 with my 7WSM burning Norma 217 and RL 33.
I've been looking for RL26 and IMR 7977 to try. Keep up the work and keep us updated.
Again I'm not trying to bash
MudRunner2005
Well-Known Member
3,000 fps with a 168 is definitely on the slower-to-average side of what those calibers are capable of. I have a 7mmRM that is pushing them WELL over 3,000 without pressure signs. And my STW's are sending 180 Hybrids over 3K without any pressure signs either. All of which are using Nosler brass, Federal 215M primers, and IMR 7828 SSC powder.
elkaholic
Well-Known Member
To be quite honest, I really don't know how it does it? I know that the magneto speed has been very accurate in the past and the velocities did jump evenly each shot. Granted, the last shot was probably more than I would ever load. I expected to exceed 3100' easily, but I did not expect over 3200'! All I can say is that I believe my chronograph......Rich
Canadian Bushman
Well-Known Member
Rich,
I know its still early but if you had to estimate barrel life with 180's running hot, where would you put this cartridge?
I know its still early but if you had to estimate barrel life with 180's running hot, where would you put this cartridge?
elkaholic
Well-Known Member
Boy, that is a very good question. Rhian and I were speculating about that last night and the only answer I have is "pretty darn good"! I don't know what is typical of the WSM or SAUM, but this has to be better. It has less capacity, a sharper shoulder, and considerably longer neck.....Rich
Canadian Bushman
Well-Known Member
Have you got enough rounds through the 6.5 version to provide evidence that it could be significantly better than the saum and wsm?
elkaholic
Well-Known Member
I have not, but based on the long action 6.5 Sherman, I think it is safe to say it will be better. My Sherman has 2000 rounds and still shoots well. The SS holds 4 grains less with the same design and a .020" longer neck than the Sherman......Rich
Canadian Bushman
Well-Known Member
Impressive. You may have just chambered my next build.
elkaholic
Well-Known Member
I do not think you will be at all disappointed.....Rich
royinidaho
Well-Known Member
Rich,
The approximate velocity increase per grain of RL 26 is 50 FPS/grain.
Just for discussion....I would think that this consistent step in FPS/grain even to the excessive pressure point would indicate that this powder may be a bit slow for this cartridge. Just speculating not saying....
With too slow of a powder my experience is that velocity increase tapers off to almost flat when when certain powder charges are reached. This is, very little increase in MV with each increase in pwdr charge.
I'm keeping a close eye on your progress as I have a trued action/bedded stock just waiting for me to make up my mind on a cartridge to order a bbl.
I'm thinking that if a slower powder could be used to attain your measured velocities barrel life could be extended. No saying, just thinking out loud.
The approximate velocity increase per grain of RL 26 is 50 FPS/grain.
Just for discussion....I would think that this consistent step in FPS/grain even to the excessive pressure point would indicate that this powder may be a bit slow for this cartridge. Just speculating not saying....
With too slow of a powder my experience is that velocity increase tapers off to almost flat when when certain powder charges are reached. This is, very little increase in MV with each increase in pwdr charge.
I'm keeping a close eye on your progress as I have a trued action/bedded stock just waiting for me to make up my mind on a cartridge to order a bbl.
I'm thinking that if a slower powder could be used to attain your measured velocities barrel life could be extended. No saying, just thinking out loud.
elkaholic
Well-Known Member
It is on the slow end for sure but very good es and velocity. Time will tell on accuracy?
Short Case
Well-Known Member
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- Oct 10, 2012
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Rich have you tried Ramshot Magnum in your SS
