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338 SIN Testing

 
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  #8  
Old 06-23-2011, 10:44 PM
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Re: 338 SIN Testing

Quote:
Originally Posted by Bob L. View Post
Hope this isn't a silly question, but say you made a 338wsm would that have any advantages or disadvantages over the 338SIN? If you could use a rem short action to make it a pack rifle.
Thanks
Bob
The Sin is taking advantage of a long action like the WSM takes advantage of a short action.

Maximized powder charge given the limited magazine length and action limitations.
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  #9  
Old 06-24-2011, 12:03 AM
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Re: 338 SIN Testing

So what case is the sin off of? Dakota?
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  #10  
Old 06-24-2011, 12:43 AM
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Re: 338 SIN Testing

Devin based it off a shortenned RUM case however I am using 330 Dakota brass made by Norma. It is good brass. The only thing is I have a slightly short neck that resembles the gibbs cartridges. That has not affected performance or accuracy in mine. I listed the case capacities of all of them over on the other thread if you want to look it up. I think the 340 wby is 6 grains more than the dakota and the sin is 6 grains more than the 340 wby. Not exactly sure but I think that is right. Then the 338 RUM is 6 grains more than the sin. 120 fps difference between the 340 wby and the 338-300 RUM so on average probably 60 fps between the sin and the RUM's. All of them are right in there. I can tell you from shooting a 340 wby for 35 years I can not tell the difference hitting an animal with it or the RUM's. Just no difference in a hunting situation. Taken elk over 1000 yards with both. 120 fps is just not enough to make a determination over other than clicks.
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  #11  
Old 06-24-2011, 07:38 AM
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Re: 338 SIN Testing

Thanks for the info LTLR.
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  #12  
Old 06-28-2011, 08:36 PM
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Re: 338 SIN Testing

Shot the 338 Sin today, figured out that my rings were a little loose, groups tightened to under 3/4" once I figured that out.

Used some R19 with 250gr SMK bullets. I worked up to just under 3050fps. I would say that is pretty much max with that powder as groups opened a little. At around 2950-2975fps I was shooting right around 1/2" groups. Low ES of 7-15fps on most loads I tried. As Don stated this is pretty easy to get a load for. Dump powder in and load bullet and you can pretty much shoot 1" or under. I plan on shooting some 300smks later this week. More to come.
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  #13  
Old 06-29-2011, 12:21 PM
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Re: 338 SIN Testing

Went out this morning to do some more testing. It seems with the lighter bullets this rifle likes the faster burning powders. I tried some new loads for the 185 grain Barnes ttsx. H-414 was the clear winner over several powders. 89 grains with a fed 215 match primer averaged 3515 fps and was by far the best load with accuracy, velocity, and velocity spread. I have had extremely good performance out of this powder shooting light bullets in the 338 winchester, 338-300 wsm and the 300 wsm along with a few others.

I shot a 3 shot 100 yard group for zero and all three shots were touching. I carried it out to 800 yards and shot a 8 3/8" group. The BC on this bullet still amazes me. Last year I did quite a bit of shooting with this bullet in my 338 winchester and had to plug in bc's around .5 for it to match my drops. I know this bullet should not have this high of a bc but it did the same thing today. Later I am shooting it over two calibrated chrono's and get it down instead of doing drop tests. I just haven't had time to do that yet.

The rifle is a 24" barrel 1-10 twist. I also shot some 225 CE bullets with several different powders. 93 grains of Wichester WMR averaged 3121 fps, 96 grains of Magpro averaged 3114 fps, 86 grains of I-4831 averaged 3153 fps and 85 grains of RE-19 averaged 3160 fps. All of these loads are max in this rifle. This rifle shoots best with max loads. Velocity spreads got smaller and accuracy got better as the powder got faster. They improved exactly with the powder burn rates. So in my rifle the faster the powder the better to RE-19 with this bullet. I may try something faster later like H-414 that did outstanding with the 185 grain bullet.

The best accuracy and least velocity spread (8 fps) was with 85 grains RE-19. The 100 yard group was all touching and the 800 yard group was 7 1/4".

What I am finding is this cartridge performs very well with faster burning powders than what you would normaly see in a 338 cartridge with this level of performance. This is due to the efficient design of the cartridge similar to the wsm cartridges. Because of utilizing faster burning powders this cartridge does great in short barrels which is what I was looking for in a lightweight backpack style rifle. A 225 grain .65 or so bc going 3160 fps out of a 24" barrel lightweight rifle that weighs a little over six pounds is pretty amazing.
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  #14  
Old 06-30-2011, 08:03 AM
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Re: 338 SIN Testing

Devin,
What length barrel is your test gun?
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