Specialty Pistols
new build questions

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https://specialtypistols.infopop.cc/eve/forums/a/tpc/f/3826077864/m/4180089186

February 28, 2016, 04:22 PM
Coppertop2621
new build questions
Hello ! Im having a xp built in 300 wsm , went with 18" bartlin barrel , 5R 1-10 twist , holland brake, PTG bolt, my question is what powder do you guys think would be best , Im going to shoot 175 gr berger VLD Hunting, 178 gr hornady ELD-X bullets , and what kind of velocity should I get ? Thanks Jimmy Burton
February 28, 2016, 06:52 PM
Da-Law-Dawg
Running H -4350 and 168 Amax's, my 14" .300 WSM averaged right at 2500.
February 28, 2016, 07:04 PM
Ernie
2550-2600 fps...Guessing


Ernie (xphunter) "The Un-Tactical"
WY-SHOT 2022 June 20-22
February 28, 2016, 07:04 PM
nmhunter
Ran RL15 + 165 nos but in mine, 15" barrel excellent accuracy and velocity in the 2775 range
Nmhunter
February 29, 2016, 12:02 PM
Rog (Buttermilk421)
I have a virtual ballistic twin of the 300WSM in my T/C Encore 30-338 Win Mag.

That bbl in the 30-338WM will push 175 Berger VLD's at 2700+ FPS (loads with new brass will do 2850 FPS using 68.0 grains IMR-4350, but case life is short with some cases showing eminent case head separation within about three firings. Primer pockets are still tight). However, in the interest of brass life, I now load 66.0 gr of IMR4350 and this load runs right at 2725 FPS.

My barrel is 16.5" long, and is a tight bore (.299/.307) which likely adds some velocity due to more pressure.

Looking at load data from various reloading manuals, I'd say the 300 WSM should be a virtual ballistic twin of my 30-338WM.

I would expect a 300 WSM to do something on the order of:

150's @ 2950 FPS
165's @ 2850 FPS
175/180's @ 2700-2750 FPS.

That 18" bbl will help retain some velocity as well. You could look at the Berger manual, and deduct what they say in their pages for velocity loss/increase per inch of barrel length. It's pretty close.

Also, a reduction of about 10% from rifle barrel length to a shorter barrel (ie 15"-18") is pretty common.


Regards,
Rog (Buttermilk421)


February 29, 2016, 12:33 PM
Ernie
I thought the WSM case had less capacity than the WM case..I was wrong again Big Grin
Looks like my guesstimate is low.
Good to hear from actual users


Ernie (xphunter) "The Un-Tactical"
WY-SHOT 2022 June 20-22
February 29, 2016, 12:37 PM
Rog (Buttermilk421)
quote:
Originally posted by Ernie:
I thought the WSM case had less capacity than the WM case..I was wrong again Big Grin
Looks like my guesstimate is low.
Good to hear from actual users



The 300WSM does have a less case capacity than the 300WM case, but compared to the 30-338WM case (338WM or 7RM parent case), it's only slightly less.

Since my 30-338WM is in the Encore platform, and the OP is planning on an XP build, it should be a virtual ballistic twin based on my reviews of load data in the manuals I have that list both cartridges (or in some cases, the 308NM version).

I almost did a 300WSM build on my own XP.


Regards,
Rog (Buttermilk421)


February 29, 2016, 05:00 PM
Leupold Man
The 30-338 is a nice round. I have just started to play with it in a custom model 70 rifle. Of course at 26" a guy would have more fps, but the thing I have noticed is the accuracy is really good. I will have more load data I will share as spring hits here in Wisconsin. It will be interesting to compare velocities.


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Veteran and NRA Life Member
February 29, 2016, 05:47 PM
Sawfish
I have a 300 WSM Striker with a 16.75" McGowen barrel. A 165 gr, RP Ptd SPCL does 2996 fps over 68.0 gr of AA-4350 fired by an F-215 primer. Federal 165 gr. Fusion ammo generates 2853 fps. I have had my best velocities with AA-4350 in this barrel.


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Good Shooting Makes Good Hunting
NRA Patron Member, FTRA Member;
Life Member SCI, NAHH, RMEF, and NSRPA; HHI Member #7108, Member CBA, NSSF

"A man can never have too much red wine, too many good books, or too much ammunition."
Rudyard Kipling
February 29, 2016, 09:51 PM
Coppertop2621
Thanks guys , I just happen to have a 8 lb jug of IMR-4350 , so looks like I'm in business! !!!!