300WSM help with bullet change.

A

AShorvath

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Rifle is a sako 75 finnlight and a Mcmillan edge stock, had it for years and reloaded it for years. Had the rifle dialed as you can see from my 300yrd group with 150gr ttsx and H4350.

Problem is I had a bullet not expand due to a little bit of a farther shot on a moose - my mistake but dead moose but in the end it was helpful in determining the bullet limitations.

I immediately started working up a new load with a 175gr LRX to try and get a little better expansion at range but the problem is I just can't get them to shoot. I worked up .5 at a time and the best group was 61.5gr h4350 at 100yrds but not what I am ok with.

Any advice? switch up the powder or?
 

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Reloader 22
760 Winchester
I would like to try staball 6.5
With the different bullet shape is the jump to the lands the same?
 
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From Barnes:

When loading a Barnes TSX, Tipped TSX or LRX bullet, your rifle may prefer a bullet jump of anywhere between .050” up to .250” or more. This distance off the lands (rifling), aka “jump” may be limited to the rifles throat length, magazine length and bullet length.

When selecting the cartridge overall length (COAL) we recommend starting with a minimum “jump” of .050” off of the lands. You can test different seating depths and find a “sweet spot” that your particular firearm prefers. We suggest working in at least .025” increments as follows seating the bullet deeper to allow a further jump. Your test plan could look something like this:

1st group- .050” jump
2nd group- .075” jump
3rd group- .100” jump
4th group- .125” jump
5th group- .150“ jump


I just did this with a different manufacture, i tried a completely different method then I usually do. Started with a ladder test, completely ignored where they hit, found a "velocity node" by using the chronograph. Then loaded up 3 of each jump in the middle powder charge of that node. To my surprise the bullet loved a longer jump then i was expecting. It really showed the difference trying this method.
 
What’s your twist rate of your barrel? I had an older 300wsm and the heaviest bullet that would shoot accurately out of mine was a 165. Those barnes typically need a faster twist than other bullets.
 
Bustercluck said:
What’s your twist rate of your barrel? I had an older 300wsm and the heaviest bullet that would shoot accurately out of mine was a 165. Those barnes typically need a faster twist than other bullets.
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I was just talking with another smith out here in BC and that was his first comment. My sako twist is 1:11" and the barnes is potentially recommending a 1:10". Would I notice this at short range though or isn't the twist rate going to show up way down range as the bullet starts to destabilize?

I have 4lbs of h4350 so would love to stick with that...
 
If you cant get the 175 to shoot, try the 168 ttsx. It is supposed to expand at quite low speeds. How far was the shot that didn't expand the 150? Ive killed elk at 300 yards with that bullet from a 308 in impact speed would have been around 2100 fps.
 
savagelh said:
If you cant get the 175 to shoot, try the 168 ttsx. It is supposed to expand at quite low speeds. How far was the shot that didn't expand the 150? Ive killed elk at 300 yards with that bullet from a 308 in impact speed would have been around 2100 fps.
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740yrds... don't judge (one bullet expanded the other didn't)

According to my calcs. it was going at around 17-1800fps on impact. Had an initial muzzle of 3170fps
 

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AShorvath said:
740yrds... don't judge (one bullet expanded the other didn't)

According to my calcs. it was going at around 17-1800fps on impact. Had an initial muzzle of 3170fps
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I would stick with what you’re shooting. If I was switching to a long range bullet than I’d try out berger elite hunter, but I’m guessing you won’t be making long shots like that on moose on a regular basis. I’ve shot quite a few moose and I’d bet my average shot distance was under 75 yards.
 
I'm assuming you've put a few down the pipe over the years. Great rifle. The monos have been known to fail to properly expand depending on velocity at distance. In regards to accuracy between mono coppers and cup and core bullets. Most rifles like to be cleaned of the different copper before shooting. You will be hard pressed to get predictable results between the different copper lubricity and how one will bond to the other. There are a ton of utoober vids on this..
TTSX bullets are really good. You may just need to rework your load due to dirty barrel and bullet jump... Cheers
 
270WSMXBolt said:
I'm assuming you've put a few down the pipe over the years. Great rifle. The monos have been known to fail to properly expand depending on velocity at distance. In regards to accuracy between mono coppers and cup and core bullets. Most rifles like to be cleaned of the different copper before shooting. You will be hard pressed to get predictable results between the different copper lubricity and how one will bond to the other. There are a ton of utoober vids on this..
TTSX bullets are really good. You may just need to rework your load due to dirty barrel and bullet jump... Cheers
Click to expand...
The closest I can get to the lands is about .18" due to the smaller/shorter magazine for the WSM. Not ideal but Barnes says that the LRX are good with a larger jump.
 
I’ve reloaded a few Sako 85’s with the 175 LRX and had no problems with the twist rate of 1:11 that Sako and Tikka use for the 30 cal. H4350 is the powder I use, I did find Reloder 16 to be better than H4350. Depending on your magazine length for the Model 75 you should be able to get within 0.050”off the lands. The Model 85 has a internal magazine length of 3.0” so hopefully you will have same dimensions.

Do you have a chronograph? You should be able to get within 2950 fps without flattened primers. The LRX is like the other monos, the accuracy tightens as you push them faster.


Another thing I do before I switch to another copper bullet is give the barrel a good cleaning. Just reassures you are starting fresh.

Go slow on working up a load and enjoy the process.
 
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