7mm WSM

[kweeks10045]

I was at Bass Pro during lunch today and was looking through the reloading supplies and noticed a pound of Hodgden Superformance powder on the shelf. When I got back to the office, I noticed that Hodgden does not publish data on the 7mm WSM for this powder. Well, I pulled up Excel and went to extrapolating data from the 300 WSM. I came up with a starting load of 63.3 grains and a max load of 70 grains with a 150 gr Speer BTSP. At max load, this gave me an estimated 3260 fps. I think I see a bunch of load testing in my future. If the max holds true, this would put the 7mm WSM within a spitting distance of the 7mm STW. In fact, after looking at it on a ballistics calculator, and, depending on who you believe for BC, they are identical to 500 yards! Anyone tried this stuff? Looks like some serious snake oil.

[scnewt]

I'm interested in seeing how this does. I shoot a 270 wsm and that's not far off from your 7mm wsm. I have been using IMR 4350 and it does well but if this Superformance stuff is better than I might give it a shot! (pun intended) ;)

[snowgetter1]

CALIBER Barrel Bullet Bullet gr Powder Powder grPrimer Shot 1 Shot 2 Shot 3 AVG FPS Published Data FPS2
300 WSM 24" SPR HP 130 SuperF 77 LRM 3514 3538 3519 3524 3645
300 WSM 30" SPR HP 130 SuperF 77 LRM 3777 3740 3759 3645
300 WSM 24" FMJ BT 150 SuperF 74 LRM 3344 3350 3347 3410
300 WSM 30" FMJ BT 150 SuperF 74 LRM 3526 3550 3538 3410
243 Win 26"N SIE BTHP 70 SuperF 51 LRM 3747 3697 3633 3692 3661
243 Win 26" SIE BTHP 70 SuperF 51 LRM 3660 3723 3746 3710 3661
243 wssm28"N SIE HPBT 70 SuperF 54C LRM 3961 3925 4000 3962 3821

This is what I have on it. The 243wssm and 243 "N" is a nitrided barrel. I was not overly impressed. Most loads were an increase of 100-150fps but the I have a spread of up to 100fps in most loads. The oddball is the 243 dropped velocity with all loads after nitriding. My 243 wssm increased 100-150fps per load after nitriding. And none of my guns shot it well.

I tried to have this chart straight but posting it messed it up. Last #s are published data. 2nd to last #sis my average data.

[scnewt]

IMR 4350 has had much more consistency for me. For the 270wsm I haven't seen much more than a difference of 50fps in a 5 shot string. Does about the same for my 30-06 too. Oh, and not to mention it also throughs a 165gr nosler ballistic tip at 2950fps out my my 30-06!!!

[scnewt]

Think that I have found the powder for extreme performance in the short fats. Look at Mag-Pro. I haven't tried it yet but it looks good on paper.

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[JCalhoun]

The 7mm WSM has a longer body than the .300 WSM does. Extrapolating data may not be terribly precise.

[scnewt]

Is the 300 and 270wsm the same legnth? I have heard of people necking the 300 down to a 270 or vice versa. I did not realize the 7mm wsm was a different legnth.

[tyler.woodard04]

yes those two are or are very close to the same. the 7mm is longer with a shorter neck. not pushing mine hard with RL25 and getting over 3000 with a 168 vld

[scnewt]

Funny note on my 270 wsm. About 2 weeks ago I made maxed out rounds with 4350 and caught grass on fire in front of me. (I was shooting prone) That rifle rachets pretty violently now but the accuracy and velocity are amazing!!! I'm just around 3300 fps now with 130gr Nosler BTs Note that I did build up to the max. I'm not that crazy! ;)