7mm Mashburn Super Magnum

[DrMike]

That looks to have been a very successful day. The H1000 is performing well for you with either bullet. You should be able to tighten up the accuracy without any trouble. Good stuff.

 

[SJB358]

Thanks Mike. That was exactly what I didn't want to happen as I don't have alot of H1000, but I think I should be able to scrounge up a few lbs for this rifle. I plan on shooting it some, but once the load is done, a lb will give me alot of shooting with it..

 

[DrMike]

Yeah, a pound would give you ninety or so rounds. Ninety rounds, when we're confident, is a good amount of ammunition.

 

[efw]

Wow Scotty lookin good man; 160s @ 3200 is whisked for any big game on this continent! Use up those 90 rounds in <20 yrs and that'll amount to a couple decades living high on the hog meat-wise!

 

[DrMike]

Wow Scotty lookin good man; 160s @ 3200 is whisked for any big game on this continent! Use up those 90 rounds in <20 yrs and that'll amount to a couple decades living high on the hog meat-wise!

At which time, H1000 should be available again. :grin:

 

[pre6422hornet]

Very Nice Scotty!

I would concur that 76 is the sweet spot.

 

[nvbroncrider]

Nice buddy that's awesome. That 76 load is dynamite.

 

[SJB358]

I have 75, 75.5 and 76 loaded at 3.550" so at my next chance, I'll be running them again! Hopefully, I can find some H1000...

Might have to hold up a sign under the bridge "will work for H1000" if this works... :lol:

 

[DrMike]

Might have to hold up a sign under the bridge "will work for H1000" if this works... :lol:

Let me know if that works. I may have to try it.

 

[SJB358]

Might have to hold up a sign under the bridge "will work for H1000" if this works... :lol:

Let me know if that works. I may have to try it.

Rgr that Doc! :grin:

 

[pre6422hornet]

Heck I would " work for range time" right about now.

4 months in between powder burns does not make Pat happy.

 

[SJB358]

Heck I would " work for range time" right about now.

4 months in between powder burns does not make Pat happy.

I know man.. I was hurting pretty bad. This project happened at a good time..

 

[IdahoCTD]

How long is the barrel Scotty? Those are decent velocities.

 

[SJB358]

It's a 24" barrel Nathan.

 

[truck driver]

Looks like you got a winner Scotty. And having a lot of fun in the process.

 

[IdahoCTD]

That's good speed for a 24" barrel. Using thinner brass then RWS will definitely yield better velocities. I'm sure the new 28 Nosler's 3300fps is in a 26" so what your getting in a 24" is pretty good for the powder burned. With reloads I'm sure the 28 Nosler would yield 3350+ but in a 26" barrel you'd get 3250ish. 100fps doesn't amount to much of a difference in the real world (50 yards of difference in impact speeds basically).

 

[SJB358]

That's my thoughts as well. Plus it'll have less blast and be a little nicer to carry up high.

 

[SJB358]

Okay, so I knew from last time out I wanted to shorten my rounds up about .010" since I was getting the 2 in and 1 out. I also split my load with 75, 75.5 and 76 and here is what I ended up with..



Averaged out to 3210 today over the chrono. So, I am happy. I am sure I could monkey with it, but honestly I am very happy with it. I met my goals with it. 3200 with a 160.

I know there is more speed to be had, if I dropped down to a Retumbo or RL33, but I am good with the consistency I am getting with H1000.

Also, I have a sweet shooting deer load with the 140 AB and IMR4350 at 3200. I figure the 280 Ackley guys are on to something there. The nice thing is it is really easy shooting load in the MSM.



I figure I can monkey with it as time permits, now that I have the main load out of the way.

So, all in all, not counting the fireforming loads, it took 12 rounds to find my powder charge, then 9 rounds today to find the seating depth.. Pretty happy with it.

Cartridge was very mild mannered across the board. Case forming is nothing more than I do with new brass anyhow, so turning 300 Win Mag cases into Mashburn cases was too easy.



Speed came pretty easily without feeling like I was standing on it. The cases all have three firings on them and they seem tight. Even the couple I ran up to 77 grains that were hot stayed tight, so the Hornady brass is holding up well.

 

[DrMike]

Now that's what I'm talkin' 'bout! Great shooting and excellent load, Scotty!

 

[longrangehunter]

Great results Scotty, besides I like those round numbers, a 160 @ 3200, very nice.