New Barrel, .300 WM or .300 PRC

[Rum Man]

Here is the 375 Ultra mag .
He needs a few things to finnish it up .

McGowan did a great job on the Barrel !
I cant wait to get behind this one .

Rum Man

 

[Overkill338]

One thing to consider is that the M77 has a very short magazine (3.400") that's not easily lengthened. A SAAMI spec PRC or a Win Mag loafed with high BC Bullets will likely have to be a single shot.

A different idea would be to go with a WSM. Using it in a long action would allow you to use any bullet you want and have it throated however you want. A WSM loaded to 3.200" gives up very little to a Win Mag/PRC loaded to 3.400".

As far as McGowen barrels go, I've had a bunch of them and they always shoot well. Most have landed somewhere around .3 MOA.

I never even thought about the WSM's, I had them written off before even giving them a chance.

I'm kind of thinking about leaving the .30's alone for awhile, and going for another .284.

 

[Overkill338]

Here is the 375 Ultra mag .
He needs a few things to finnish it up . View attachment 162333McGowan did a great job on the Barrel !
I cant wait to get behind this one .

Rum Man

Man oh man, I love that 375!

 

[elkaholic]

I never even thought about the WSM's, I had them written off before even giving them a chance.

I'm kind of thinking about leaving the .30's alone for awhile, and going for another .284.

7 Max would work well with that action and give you 3000' with a 195

 

[Overkill338]

7 Max would work well with that action and give you 3000' with a 195

The only 7 I've ever had was the 7mm Rem Mag, and a couple 7mm-08. What is the 7 max?

 

[elkaholic]

The only 7 I've ever had was the 7mm Rem Mag, and a couple 7mm-08. What is the 7 max?

shermanwildcatcartridges.com
good explanation here

 

[Overkill338]

shermanwildcatcartridges.com
good explanation here

Thank you! I'm sorry to sound like a noob. I'm not new, just always hung my hat on belted mags.

 

[elkaholic]

Thank you! I'm sorry to sound like a noob. I'm not new, just always hung my hat on belted mags.

Hopefully the website will help you make your decision. The Sherman Short Mags are far more efficient than the belted magnums and with brass, dies, reamers, and soon loaded ammo, they really aren't even wildcats anymore.

 

[Overkill338]

Hopefully the website will help you make your decision. The Sherman Short Mags are far more efficient than the belted magnums and with brass, dies, reamers, and soon loaded ammo, they really aren't even wildcats anymore.

May shoot you some PM's too.

 

[elkaholic]

May shoot you some PM's too.

Feel free to call too!

 

[Overkill338]

shermanwildcatcartridges.com
good explanation here

I found the 7 SS, is that what you meant? Would my action work for the .338 Sherman S well?

 

[elkaholic]

I found the 7 SS, is that what you meant? Would my action work for the .338 Sherman S well?

7ss is good but 7 max was what I was referring to. look under medium actions

 

[Mram10us]

How could you write off the wsm!? Insanity

 

[yorke-1]

Hopefully the website will help you make your decision. The Sherman Short Mags are far more efficient than the belted magnums and with brass, dies, reamers, and soon loaded ammo, they really aren't even wildcats anymore.

Soon you'll have to change your website to "shermanproprietarycarteidges.com". LOL