Custom .300 Win Mag Build

mitch260

Well-Known Member
Joined
Sep 5, 2012
Messages
210
Location
Michigan
Hey Guys,

I don't post on here a whole lot, but I kind of want to show off this build I just finished up. Here are the Specs:

-Barrel: Bartlein 26" Heavy Palma 1-9" twist. I had originally gotten this barrel for an F-T/R rifle but never ended up using it.

-Action: My own design. Its an aluminum and steel hybrid design, used the bolt from a Thompson Center Dimension. Picked it up at the local sporting goods store for $125. Barrel and action are coated with FDE Duracoat. Barrel tenon is standard Savage Large shank so I could use a Savage barrel nut.

-Trigger: Bold Optima Mauser trigger set at 2 pounds. I'm actually impressed with how good this trigger feels for only $50.

-Stock: Mcmillan A4 w/ the enlarged but Hook. Got a good deal on this as a "flat top" through a McMillan stock liquidator. I installed 2 flush cups on the left side, I should have put the back one on the right side. The stock is painted flat black.

-Muzzle Brake: Made it out of a piece of a hexagon shaft out of a combine. Its a 3 port design. Works pretty good, but could be better.

-Scope: For now, I just have a Millett 6-25x56mm on it. I got it for christmas a couple years ago and it's actually working ok. I shot at 710 yards earlier today and dialed the exact amount my AB app told me too and was hitting a 8" steel plate. Tracking seems to be pretty good so far.

My load right now is a 215 Hybrid over 75 gr of RL-26, COAL is 3.700". Average velocity was 2926 FPS, SD of 4 and ES of 12. These were measured with a Magneto Speed. I was pretty impressed with those numbers.

I had trouble getting it to group at first but it has come into it now. At 100 yards I have gotten 3 shot groups as small as 1/4 MOA and 5 shot groups running right at 1/2 MOA. At 710 yards this morning, I shot the 8" gong twice, vertical was right about 4" one right above the other. I also shot a milk jug, it hit right where I had the crosshairs. I'll try to get a couple pics of groups up tomorrow.

So far I'm pretty happy with how it has turned out, I only have like $800 into it. The finish has some scratches from a bunch of work I've done to it since I painted everything (kind of jumped the gun on painting stuff before I had everything up and running smoothly, I plan on repainting at some point), but all in all, I'm really liking it and the .300 Win Mag cartridgegun).
 

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mitch260

Well-Known Member
Joined
Sep 5, 2012
Messages
210
Location
Michigan
Thanks, I'm pretty happy with how it turned out. Like I said, still need to repaint it, but other than that its good to go. I'm pretty excited to use it this season, along with a .338 Lapua I'm putting together.
 

Clark

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Joined
Oct 19, 2006
Messages
755
-Action: My own design. Its an aluminum and steel hybrid design, used the bolt from a Thompson Center Dimension. Picked it up at the local sporting goods store for $125. Barrel and action are coated with FDE Duracoat. Barrel tenon is standard Savage Large shank so I could use a Savage barrel nut.

I have built a number of 300 win mags, but not my own action.
I can make scope bases, pillars, recoil lugs,... But I can't get my mind around making the action.
 

mitch260

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Joined
Sep 5, 2012
Messages
210
Location
Michigan
I can't get it to load the pictures of the targets. I'll try to get them up as soon as I get it figured out.

The action really isn't that hard to make. The hard part is the bolt, but I bought that anyways. I made the whole receiver on a manual mill with only a vise, no rotary table or dividing head, after turning it and boring it on a lathe. It is two pieces that are epoxied together, which made it even easier to make. One of these receivers is just as if not easier to make than a scope rain in my opinion, it is quite simple. I had more time into designing it and deciding on dimensions.
 

mitch260

Well-Known Member
Joined
Sep 5, 2012
Messages
210
Location
Michigan
Finally got it to work, here are some targets.

First is a 5 shot group at 100 yards. 4 shots are .400" the fifth opened it to just over .600" I'm would consider myself a .5 MOA shooter on average so the gun probably more accurate than me.

The second pic is of 2 shots on an 8" gong at 710 yards. Mine are the left and right shots. only about 2 inches apart. I misspoke in the original post, I had gotten confused about whose hits were whose. We confirmed that these two were mine. The middle one is from a friend of mine who was shooting his 7mm Rem Mag. I only shot at the gong twice.

The last picture is of a jug I shot right after shooting the gong, perfect elevation, one inch right of center.

I think it will do all right for a hunting rifle.
 

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