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1200y+ Mosin Smyert Mk 3.7

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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Fung_13 » Wed Apr 01, 2015 7:41 pm

Grimstod, I didn't know you know Tom Brady..... and you got a picture of him shooting..... lol
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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Grimstod » Thu Apr 02, 2015 3:16 am

Who is that?
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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Fung_13 » Thu Apr 02, 2015 11:25 am

Grimstod wrote:Here is what she looks like. 27in long barrel now. Still in the white but will change that as soon as I can.
the guy in this group of pictures. Kinda looks like Tom Brady, NE QB
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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Grimstod » Fri Apr 17, 2015 4:45 am

The 54r Improved is very efficient.
Been looking at my MV results of the 54r compared to the 300WSM and it looks likke the 54r inproved is so ecficient that it can actually beet the 300WSM by 100fps. For example the 300 gets 2794fps with 59gr of W760. The 54r Improved gets 3050fps with the same bullet and charge. Now the 300WSM was shot from a 24in barrel and according to Berger if we add 27fps per inch it lands it at 2902fps. Still its lagging by almost 150fps. Keep in mind to that the 300 was with magnum primers. I am using a non magnum primer. Granted the 300swm can hold up to 65.4gr of W760 even at that weight it only pumps out 3080fps. The 54r Improved will yield 3204 with just 60.5gr.
Now lest look at our photo. How does it stack up against the 30-06. Actually not that much better but it is now much faster. Berger lists max safe velocities at 2860fps with 56.3gr of W760. The 54r was managing 2950 average using the same bullet and weight. The 06 is more efficient then the 300 but this is to be expected out of two cases that have radically different over bore ratios.
Now how about the 54r compared to the 54r Improved (54rI). Well we all know that the 54r though it does not hold as much powder as the 06 is about 200fps more efficient then its 06 competitor. The 54r Improved is a little less efficient then its parent case but not by much. Now I do not yet have a lot of data yet for a side by side comparison of the 54r and 54rI but that is because I have no loads worked up for a standard 54r in W760. That will come eventually.
In conclusion I would say it is looking very promising. Its knocking out the competition when it comes to case efficiency. Now we just have to see if accuracy is going to be as good as the 54r parent case.


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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Grimstod » Fri Apr 17, 2015 4:46 am

54r Improved leaves the 30-06 in the dust.

I did more testing this last weekend. Looks like this thing is a lot more powerful then a 06. This time I loaded up some 190gr Bergers. This case def really likes these a lot more then the 168gr bullets. Accuracy even though I was doing a ladder test was much better. I did not fill the case this time as I was out of brass. At 54gr of W760 it out performed a 06 in Bergers reloading book and I still have lots of case capacity to fill up still. Now that I have some brass empties I will have to load up some hotter ones and give it another try. Can probably get to 2900 with these. I had absolutely no primer flattening or flow at 54gr. Case was only about 87% full.

Top MV was 2730fps with 54gr of W760 and CCI 200 primers. There was another guy there at the range shooting a 300WSM with 185gr berbers, and getting 3100fps out of a 30in barrel. His primers were very flat though. Much flatter then mine. Then again I have not filed these all the way up yet. I may not be able to reach 300wsm performance in the real world but it nice to know that the efficiency of this case is superior. This case will hold 60gr of powder so it has plenty of room still at 54gr.
I also fire formed some more brass. Gives me another 10 cases to work with. Will definitely need to anneal soon though.

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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Grimstod » Fri Apr 17, 2015 4:48 am

Even with a 190r bullet that sinks very deep into the case I can still get 57r in it and the powder still sloshes around in it. You can see my ladder to the left. Insuspect there is a accuracy node around 50.5gr so i have. A seperst ladder to inspect that portion of my presure curve cloesly. Mind you 57gr may not he safe. If loads get to hot before i get to 57gr i just wont shoot it. Ill pull the bullet appart and reweigh the powder for another day.
I will go to the range today to run these tests.

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Re: 1200y+ Mosin Smyert Mk 3.7

Postby ShootnMathews » Fri Apr 17, 2015 7:29 pm

Good work Ben. Keep it up. As a side note. Of the handful of 300 WSMs I have seen, even the factory loads come out with super flat primers. May just be because the case is so fat. IDK.
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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Grimstod » Sat Apr 18, 2015 7:01 am

Went last night. Got to 2830fps with just 55.5gr. I think I I had my bolt bushed to fill in the massive space around my firing pin I could shoot hotter loads. Right now My primers still look factory round. There is enough room in the case to go to 57.5 gr of W760. at the rate of velocity gain this case makes that would be just about 3000fps. Pretty fast for a 190r bullet.
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Re: 1200y+ Mosin Smyert Mk 3.7

Postby 0933 » Sat Apr 18, 2015 9:12 am

Good info!! :thumbup:

I'm seriously considering doing a 7mm Altius... from the data it should be about the same as a 7mm SAUM, and my buddy has a rifle in that caliber. It'll shoot the 180 grain Bergers to 3,000+ fps in a 28" barrel. The external ballistics of that round are impressive! 8-)
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Re: 1200y+ Mosin Smyert Mk 3.7

Postby Grimstod » Mon Apr 27, 2015 4:36 am

Accuracy is getting there. I shot a group at 300yards that was one inch. Need a better way of seating bullets though. Right now runout is really bad because of how I am sizing them.
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