338-375 Ruger Demon

[Kiwi Greg]

My 7 & 30 cal 375 Rugers are very impressive performers especially with RL 33.

I might have to have a serious think about the 338 version

 

[rigmaster10]

Yeah The 338 Screams. But I Have Renewed Faith InThe 375 With 350 Gr. SMK.

 

[Kiwi Greg]

Yeah The 338 Screams. But I Have Renewed Faith InThe 375 With 350 Gr. SMK.

Assuming Cutting Edge do a Lazer projectile in 375, it could become a very handy long range 375 hunting rig lightbulb

 

[Kiwi Greg]

Yeah The 338 Screams. But I Have Renewed Faith InThe 375 With 350 Gr. SMK.

Any more data on the 300 performance in the 338 ?

 

[rigmaster10]

Sorry I have not done any testing with the 300 gr bullets. I have been working on the 375 Hammer and 7x375 ruger. I plan to someday but other shiny things have caught my attention.

 

[benchracer]

Yeah The 338 Screams. But I Have Renewed Faith InThe 375 With 350 Gr. SMK.

Earlier you mentioned 2700 fps from a .375 Ruger case with a 350 grain SMK. Is this rifle using a 27" barrel as well? What powder are you using to achieve this?

 

[rigmaster10]

Originally yes it was a 27" Brux #3 contour. I recently changed it out to a 28" benchmark. And have modified the chamber and throat to accomodate this. I have been using 7828 SSC. I wont list load data as im on reload two and allot of the prime pockets are getting loose. I need to find a high bc 300-320 grain bullet that is affordable. As I said I reached the 2,700 node. But am destroying the brass. If i can get a lighter bullet to go 2800 and reduce pressure it would be optimal. But im not going to use accubonds with a .485 bc. Due to the 1000 yard mark the 350 SMK starts to pull away. Hope this helps. I may also send the reamer off and change the shoulder angle for a bit more capacity and keep playing with the free bore.

 

[benchracer]

Thank you. That is useful information. I had figured a max of around 2600 fps from a 26" barrel with a similar case capacity.

 

[rigmaster10]

Yeah I thought i was going to get away with the speeds i was running. With the free bore I added. But no such luck. In the past i would have just kept buying brass. But these days im into longevity and consistancy. In the long range world radical swings in anything are not a good thing. Im beginning to understand why the military ran the .308 for so many years. Its a dog sled but it always performs the same.

 

[scottw2119]

I know its bouncing from the 338-375 but im in the middle of a 7mm-375 build looking for some forming and loading info i have ordered a bushing die with 4 bushings to step down and a set of full length dies from ch4d dies and i have ordered a reamer and go gauge from ptg any hints form anybody with experience on this caliber would be greatly appreciated

 

[rigmaster10]

Right now I'm going to push the 7 lrm reamer .100" deeper into the chamber to give it volume back. To do this I have to size a false shoulder on the Lrm brass and fire form. I like the lrm brass. So fire forming is about as easy as stepping down 375 brews 30 times. Hope this helps

 

[scottw2119]

thanks but is there any lrm brass available fire forming would be a lot easier but if gunwerks wont let go of any is there any other means of ordering it

 

[rigmaster10]

Last I checked they have a bunch. Is your reamer just necked down 375. If so that's perfect.

 

[moombaskier]

thanks but is there any lrm brass available fire forming would be a lot easier but if gunwerks wont let go of any is there any other means of ordering it

Yep! That's where I buy mine.