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Max Online: 16728 @ 03/25/12 08:51 AM
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#5966351 - 10/07/15 04:21 PM Exactly how much more handloading velocity out of 300 WM vs 300 WSM?
Gravytrain Online   content
THF Celebrity

Registered: 01/06/11
Posts: 16872
Loc: Rowlett, Tx
I am drawn to the 300 WSM because I have some hunting SA stocks and would like to get an SA chassis
and have the ability to swap things around with other SA calibers. I know that the 300 WM can produce
some additional velocity. Let's say I stick to 208gr or 210gr which I believe will both work in 300 WSM
COAL range. How much is the added velocity with 300 WM and is it worth it in your opinion?

I only want to be able to punch paper at 1000 with the 300 WSM. Maybe an elk hunt some day, where I would keep
the range to 400y as long as I was confident with the rifle out to 500y.

Bonus points for 7mm WSM opinions.


Edited by Gravytrain (10/07/15 04:31 PM)

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#5966385 - 10/07/15 05:01 PM Re: Exactly how much more handloading velocity out of 300 WM vs 300 WSM? [Re: Gravytrain]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9393
Loc: Lewisville, TX
With a WSM on a short action, the problem you run into with the big, heavy, and long 208 and 210 bullets is overall length. On a short action, you have about 2.880" max length to work with. If you seat a 208 A-max even with case mouth and the ogive of the bullet, you are already at 2.877" (see math below). The 210 VLD gives you a little more room, but not much. But, the bullet is seated so deep into the case, it eats up powder capacity. This will reduce your speeds quite a bit. Most shooters who run a WSM case with the heavy bullets put it on a long action, and throat the chamber long to seat the heavy bullets out far and gain powder capacity. If you just want to punch paper out to 1K, a 210 VLD may work best. The gunsmith will need to use a zero throat reamer, or specially cut the throat to get the 210 on the lands at your max length. It can be done.

The 300 WSM was designed to duplicate the speeds of the 300 WM with a 150 grain bullet. It gets pretty close to this by efficiency of case design, and a fat, compressed powder column. Once you start increasing the bullet weight, the WSM begins to keep up less and less with the Win Mag. The heavier you go with the WSM, the more velocity you will lose to the WM. Generally, the Win Mag is faster by about 100-150 fps over the WSM. For the reasons above, is why I'm a fan of the 300 Win Mag. If I had only 1 caliber to chose, a 300 Win Mag would be it. I'm running a 225 Hornady BTHP at 2900+ fps suppressed, and ~2850 fps unsuppressed. A 190 grain in the WM is generally 3000-3050 fps.


300 WSM case length- 2.100"
208 A-max ogive to tip length- .777"
Total- 2.877"

210 VLD- ogive length- .708"
Total- 2.808"
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#5966443 - 10/07/15 05:51 PM Re: Exactly how much more handloading velocity out of 300 WM vs 300 WSM? [Re: Gravytrain]
Gravytrain Online   content
THF Celebrity

Registered: 01/06/11
Posts: 16872
Loc: Rowlett, Tx
Thanks Chad,

How about the AccuBond Long Range 190gr bullet in a WSM?

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#5969496 - 10/09/15 01:17 PM Re: Exactly how much more handloading velocity out of 300 WM vs 300 WSM? [Re: Gravytrain]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9393
Loc: Lewisville, TX
Sure. I don't know what the ogive to tip length is on the 190 ABLR. But the plastic tip will increase the length some.
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#5970236 - 10/10/15 12:47 AM Re: Exactly how much more handloading velocity out of 300 WM vs 300 WSM? [Re: Gravytrain]
300_WizzM Offline
Woodsman

Registered: 03/15/14
Posts: 243
Loc: Grand Saline, TX
I shoot the 300wsm. With a 178 AMAX I get an average of 3000fps. I have recently started playing with the 208 AMAX and 210 berger. My first run only yielded 2765 on with the highest load. But from the looks of it I have plenty of room to increase charge. Also as Chad stated I can't even come close to the lands and have considerable jump. This all being said I did a .5" group at 300yds.

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#5971227 - 10/10/15 09:17 PM Re: Exactly how much more handloading velocity out of 300 WM vs 300 WSM? [Re: Gravytrain]
6.5x47Lapua Offline
Tracker

Registered: 12/13/14
Posts: 518
Loc: dfw
This is the reason why more and more medium actions are coming to the market. A 300wsm sure is nice at 3.1 inches.


http://texashuntingforum.com/forum/ubbthreads.php/topics/5693021/1

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#5974138 - 10/12/15 06:26 PM Re: Exactly how much more handloading velocity out of 300 WM vs 300 WSM? [Re: Gravytrain]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
I love the 7Wissum cuz U had one. It was a laser, I now have another laser
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