300 WSM low velocity issue?

[Wingnut00]

Just out of curiosity what is your over all length of a loaded round. If you posted it I missed it. And also just curious if you have tried 168 Berger vld just to cross reference velocities between the two. I put some of those 168 classics through a 300 win mag for a guy that wanted to shoot that bullet and velocities seemed really slow. Just curious.

 

[KINDA-NEW-GUY]

2.955" OAL
I've tried multiple bullets, and the 168 classic hunters just so happen to be what I am trying at the moment.
Same issues with all the projectiles I've tried. Slow velocities, and early pressure signs

 

[Wingnut00]

2.955" OAL
I've tried multiple bullets, and the 168 classic hunters just so happen to be what I am trying at the moment.
Same issues with all the projectiles I've tried. Slow velocities, and early pressure signs

Ok. No offense what so ever and I'm guessing you probably know what you are doin but I gotta ask. How do you find your oal and also how far in the lands do you have your bullet at that length. I'm only askin cause I just recently got into a 300wsm little huntin rifle and like others have stated and you also velocities seem weird. I'm pushin 190's at 2890 with 24" stick and I ain't even really began to tinker.

 

[KINDA-NEW-GUY]

No offense taken at all. Sorry if I sounded short. I'm at the reloading bench cooking up some stuff for my new 6.5x47.

Let me get done with my loading and I'll fill you in on everything

 

[KINDA-NEW-GUY]

And the reamer that was used for this chamber is freebored for the 215 Bergers. So I have quite significant jump to the lands, they are in means touching or "jammed" in the lands.

 

[Wingnut00]

K. Take your time. When ever you can measure inside diameter of fired case. I just took a quick look at hodgden website and with 168 matchking which is just what they list and loaded I think it said 2.840 max load with 4350 is 64.5 and you are significantly longer so I'm just tryin to get my thinker thinkin.

 

[Wingnut00]

And the reamer that was used for this chamber is freebored for the 215 Bergers. So I have quite significant jump to the lands, they are in means touching or "jammed" in the lands.

Um. When you chamber a freshly resized piece of brass is there any resistance

 

[KINDA-NEW-GUY]

I use an OAL gauge, and see exactly where my bullets touch the lands and go from there.
I'm at the OAL length I'm using now, because that's what groups the best, and since I have no worry about touching the lands because of my freebore, I can have them out longer in the case.
There is no resistance with a freshly sized case with or without a bullet in the case.

And the fired brass measure about .311 inside the neck.

 

[Wingnut00]

K. Like others have stated I would bet you have a tight bore. I was just tryin to think of basic stuff that is will jack pressures up. Best of luck with it man.

 

[KINDA-NEW-GUY]

Thanks gents. I was about 99.998% sure it was a barrel issue. Just needed to make sure it wasn't anything I was doing before I called Brux, and sounded like I had no idea what I was doing. I'll keep everyone posted, and update the results.

 

[Geno C]

Not saying your barrel is a dud, but, all makers put one out ever now and again. I know for a fact brux is not afraid to replace a barrel that won't shoot.

 

[KINDA-NEW-GUY]

@Geno C, I hear ya. I know how it is. Can't expect perfection 110% of the time. Just needed another set of eyes and brains taking a look to make sure I wasn't the problem. I've heard nothing but good things about Brux customer service. So I'm not too worried about it.

 

[Bullet Guy]

Stiller LA
Brux 1-10 27" #3 contour
Norma brass
Ptg reamer with throat for 215s

I have tried many different combinations of bullets and powders. I seem to fall way short of expected velocity with every bullet. I am currently shooting 168 classic hunters with 64.2gr H4350 at 2865fps. They are super accurate but an increase in powder reaches pressure signs before any reasonable 300 WSM velocities. I can get this speed or very close to it with a 308. I bore scoped the barrel after cleaning and can't see an issue. What could be the issue? I have heard of other people having the same velocity issues with Brux barrels but I want to make sure that I have eliminated all other possibilities of me being the problem.

You need to see that the grove diameter on the barrel is right.

 

[L.Sherm]

Thread is 5 years old

 

[Laguna Freak]

Stiller LA
Brux 1-10 27" #3 contour
Norma brass
Ptg reamer with throat for 215s

I have tried many different combinations of bullets and powders. I seem to fall way short of expected velocity with every bullet. I am currently shooting 168 classic hunters with 64.2gr H4350 at 2865fps. They are super accurate but an increase in powder reaches pressure signs before any reasonable 300 WSM velocities. I can get this speed or very close to it with a 308. I bore scoped the barrel after cleaning and can't see an issue. What could be the issue? I have heard of other people having the same velocity issues with Brux barrels but I want to make sure that I have eliminated all other possibilities of me being the problem.

I haven’t read all posts so I may be repeating somebody else’ s opinion.

Personally, I think the 300 WSM is better suited to 180 to 215 grain bullets and appropriate burn rate powder. After trying RL16 (which is a 4350 burn rate range powder) with 180 gr Scirocco II and having 0.4 moa at 100 yds, and 1.3+ moa results at 200 and 300 yards, I switched to RL 23. I’m not finished but it looks probable that I will consistently get 0.5 moa at 300 yards now. That is, when I do my part with the 300 WSM torque-monster in a 21 year old model 70 Featherweight.

 

[Plumsask]

Pretty sure his barrel is shot out by now.......