300 wsm vs 300 wm

daniellybbert

daniellybbert

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Just went out tonight and my cousin dropped by so we stepped out the front door and shot our guns over the chrony
he was shooting a 300 wm in a savage and shot 2 bullets both were winchester supreme 180 grn silver tips (factory)
I was shooting a kimber montana in a 300wsm
mine were loaded with 67grn of Imr 4350 and 180 grn TSX
over the chrony
the WM was 2941 fps and 3023 fps
the WSM was 3144 fps and 3136 fps

just thought id post it
not really scientific but wtf
 
well I know that but it was a fly by the seat of our pants just for fun thing
and litteraly we just stepped off the deck to do it so it wasnt a real controled experiment
 
All I do know, is even if you aren't getting any "signs" of pressure, your WSM load is well outside of SAAMI. Those speeds should not be coming out of a WSM and you are 2 gr outside of the highest amount of IMR 4350 I've ever seen in a load manual. Even with CCI primers you would be in the 75,000+ psi range.
I'm not trying to armchair you here, I am telling you from experience that will eventually damage that firearm. Be careful, I really don't want to see you hurt.
(I use 67.5gr of H4350, which is a slighty slower powder, behind a 165 TSX in my Kimber 300WSM, and that is a maximum pressure load)

Cool post, but it is all relative. The WSM has less case capacity, so if you were to load both with the same bullet and powder the WM will always come out on top. And that speed difference, with the higher BC of the BST, would only amount to maybe an 1" of difference in drop at 400yds.
 
Do you really think the critter you are hunting will notice the 100 or so ft per second difference?
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nope probably wouldnt even know the caliber
just thought some people would think it was an interesting tidbit (like myself)
Those speeds should not be coming out of a WSM and you are 2 gr outside of the highest amount of IMR 4350 I've ever seen in a load manual. Even with CCI primers you would be in the 75,000+ psi range.
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the load data in my hornady volume 1 book 6th edition says 180 grn bullet can shoot a max of 66.5 grns of IMR 4350 for a speed of 3000fps
my barnes # 3 manual puts the 180 xlc 66.5 grns IMR 4350 for a speed of 3025 fps
that was before load data was out for the tsx
I coat my barrel with gun juice and I believe that gives me a few fps and a bit more powder makes up the rest
I have been shooting since very young and have been reloading for about 5-7 years so Im not a pro but I think Im safe enough
and I do also shoot the fedreal gold medal LRM primers
 
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my barnes # 3 manual puts the 180 xlc 66.5 grns IMR 4350 for a speed of 3025 fps
that was before load data was out for the tsx
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And according to barnes,the xlc can be loaded to higher velocities than the tsx because of the coating.Yet you are driving the tsx over 100fps faster than their load for the xlc.

and I do also shoot the fedreal gold medal LRM primers
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Which are hotter than the cci 250s.
 
yeah but its still good to go there on their 4 firing and i havent had to trim them yet the primers are tight and there isnt really a extractor mark unless its 30 degrees outside (and then only if your really looking for it)
 
there isnt really a extractor mark unless its 30 degrees outside (and then only if your really looking for it)
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Of course you are aware that pressure signs such as brass flow or extractor marks don't normally appear until you are well past the design pressure for the cartridge,usually in the 75,000psi t range.
 
maybe but I have shot this gun and this load for 2 or 3 years now and havent had a problem and it has killed quite a few animals and it is acurate killed a doe at 526 yrds
so I just threw the # out
Im not going to change it cuz its been working as a pretty good hunting and goto gun
 
maybe but I have shot this gun and this load for 2 or 3 years now and havent had a problem and it has killed quite a few animals and it is acurate killed a doe at 526 yrds
so I just threw the # out
Im not going to change it cuz its been working as a pretty good hunting and goto gun
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A gun can still be quite accurate even with excessively high pressures.Hopefully you will not have to learn about metal fatigue due to excessive chamber pressures the hard way.
 
daniellybbert said:
Just went out tonight and my cousin dropped by so we stepped out the front door and shot our guns over the chrony
he was shooting a 300 wm in a savage and shot 2 bullets both were winchester supreme 180 grn silver tips (factory)
I was shooting a kimber montana in a 300wsm
mine were loaded with 67grn of Imr 4350 and 180 grn TSX
over the chrony
the WM was 2941 fps and 3023 fps
the WSM was 3144 fps and 3136 fps

just thought id post it
not really scientific but wtf
Click to expand...

67 grds og either 4350 powder and a 180 gr bullet is way too hot, the #'s should be more reversed, the win mag holds quite a bit more powder safely than the wissum. My max load which was hot in my 300 WSM was 65 gr of H4350 and a 165 gr bullet.
 
Hell you could probably jam 60 gr of varget in a 30.06 and get that kind of velocity for a few rounds until one day you are blind and your right hand is missing the thumb, but you will at least have good velocity.
 
daniellybbert said:
yeah but its still good to go there on their 4 firing and i havent had to trim them yet the primers are tight and there isnt really a extractor mark unless its 30 degrees outside (and then only if your really looking for it)
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daniellybbert said:
maybe but I have shot this gun and this load for 2 or 3 years now and havent had a problem and it has killed quite a few animals and it is acurate killed a doe at 526 yrds
so I just threw the # out
Im not going to change it cuz its been working as a pretty good hunting and goto gun
Click to expand...

I would say that you will eventually have an issue. The XLC data is almost always 2+ grains, more than the max for the TSX. This is especially true considering I am comparing my NEW Barnes manual and the #3 Data for TSX to XLC and they are not even close. But hey, it's your face:eek:.
Just keep those loads low profile, for the newbies sake.
 
Come on you guys, I thought those things were supposed to equal 300 WBYs in a short action with less powder more accuracy and almost no recoil......pure magic. Haveing said that, the Small Kimbers do make sence as a platform for the WSMs. Just not for me. I'll take case capacity over magic every time.
 
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