300 OSSM Range Report: Spr 150HC -COL

Discussions on the Olympic Arms WSSM Series

Moderator: Charlie-2-6

300 OSSM Range Report: Spr 150HC -COL

Postby Hoot » Sat Jun 18, 2011 4:43 pm

Well, the shooting gods must be angry with me. Not only have I been unable to locate any .308 Speer HotCore 165gr bullets locally for my next experiment(s), but I didn't have enough of the 150s left to do a full workup. I wound up doing 4 groups of 4 instead of 5, so our sample base is a little smaller. I could still demonstrate what I hoped not to and learn and share something new. I have been loading my recent tests at 2.40 COL because I believe there is worth in getting the bullets closer to the lands. In most cases, the proof is in the reports. In the case of these short ogive HotCores, it just goes to show that when you have it dialed in and the ojive is short, COL is not as critical.

In my previous report, I demonstrated that 43.5gr and 49.5gr of Varget yielded great groups loaded to 2.40 COL:

Image

To add some objectivity, I worked the bullet and charges backwards to 2.28 COL, which is the longest I feel comfortable fitting in an un-modded .300 OSSM magazine for those shooters who wanted some loads that worked, without modding their magazines.

Not having enough bullets to run the same workup, I chose two ranges near the previous results that should have come close.

Here are the results:

Image

yielding these groups

Image

Given the deeper seating of the bullet, I probably should have loaded the lower range lower in charge as opposed to higher. I suspect it I had used say 42gr and 43gr, I may have seen a repeat of the 43.5gr load at 2.40 COL. Those lower loads are kinda tame anyway, and that 49gr load is to die for, while delivering good power.

Hoot's Pick for the Speer 150gr HotCore is 49gr Varget / Rem 9 1/2 Primer/ 2.28 COL / 2860 fps

Add that one to your short list for the .300 OSSM. While you're at it, might as well throw in the 48gr as well.

Respectfully submitted;

Hoot
In Theory, there is no difference between theory and practice. In Practice, there is.
User avatar
Hoot
Expert Rifleman
Expert Rifleman
 
Posts: 457
Joined: Tue Dec 28, 2010 2:40 am
Location: Minnesota

Re: 300 OSSM Range Report: Spr 150HC -COL

Postby Globemaster » Sat Jun 18, 2011 7:30 pm

Hoot's Pick for the Speer 150gr HotCore is 49gr Varget / Rem 9 1/2 Primer/ 2.28 COL / 2860 fps

looks like a real Winner! :thumbs up:
The Nonsense Stops! … When The Hammer Drops!
Image
User avatar
Globemaster
OA2 Staff - AC/TEAM MEMBER
OA2 Staff - AC/TEAM MEMBER
 
Posts: 20828
Joined: Wed Dec 28, 2005 4:42 pm
Location: Socialist Republic of Washington State

Re: 300 OSSM Range Report: Spr 150HC -COL

Postby Hookset » Sun Jun 19, 2011 2:37 pm

Beautifu!, Varget is one of my favorite powders. Called on my gun 3 weeks agr and they were getting ready to dip it, has to be close and this will be a load I try to work up after the break in. Thanks for all your postsfort
Hookset
Rifleman
Rifleman
 
Posts: 38
Joined: Sun Nov 28, 2010 12:38 pm

Re: 300 OSSM Range Report: Spr 150HC -COL

Postby Hoot » Sun Jun 19, 2011 6:02 pm

I hope the source was wrong, but I just read in a late 2010 forum post that Speer is discontinuing the HotCore flat base bullets, replacing them with the Deepcurl product line. If you think you would want some for reloading, I suggest you buy them if you can find them still in stock. Wishing now that I had tested the 165s a while back to determine whether I wanted to stock up on them ahead of time. The other possibility is that once they start shipping the Deepcurls, distributors will discount the remaining HotCores they have in stock.

Hoot
In Theory, there is no difference between theory and practice. In Practice, there is.
User avatar
Hoot
Expert Rifleman
Expert Rifleman
 
Posts: 457
Joined: Tue Dec 28, 2010 2:40 am
Location: Minnesota


Return to WSSM Central

Who is online

Users browsing this forum: Google [Bot] and 1 guest

cron