New Backpack Rifle Build - Help

[JM151]

I’m looking to build a new rifle on the Manners folding stock. My goal is to build a lightweight heavy hitter, short barrel, and running suppressed. Spotting impact will be a factor as well. The two cartridges I have it narrowed down to are 300 Rum in a 18” barrel shooting (Berger 215) or a 338 Edge in a 20” barrel shooting (Berger 250). The specs will be:

Manners Folding Stock
TIx or AntiX
Bartlein 3B
UM DBM or Wyatt’s 4”
Suppressor Magnus-S-RR (yes this can does reduce recoil like they advertise). I got several more on order Magnus-k-RR and a Magnus-S-RR in 338
Trigger Tech Diamond

So out of the two cartridges and barrel lengths which would you recommend? Does anybody have experience with a 18” 300 Rum?

 

[greyghostnw]

whats your goal for velocity for the 215’s? Available powder to use?

 

[JM151]

@greyghostnw well my 300 win mag 24” barrel is throwing them 2840 so I’m thinking at least 3050 with H1000. End of the day if I’m at least 2975 I’m good.

Powders I pretty much have everything H1000, Retumbo, N570, RL26

Plan is to sell my 300wm if I go 300 RUM….it’s a Fierce factory rifle and I don’t really like it.

 

[JAC8504]

Spotting impact with a lightweight 300RUM or 338edge

I have a similar build in mind with the manners stock. However, I don’t ask to be able to see impact. I know the recoil is going to happen. I’m probably going the 300PRC route. Probably doing a 20” or 22” proof

Still haven’t decided on action yet. I want a CRF ruckus, ARC action, or zermatt

 

[JM151]

Spotting impact with a lightweight 300RUM or 338edge

I have a similar build in mind with the manners stock. However, I don’t ask to be able to see impact. I know the recoil is going to happen. I’m probably going the 300PRC route. Probably doing a 20” or 22” proof

Still haven’t decided on action yet. I want a CRF ruckus, ARC action, or zermatt

Having the Magnus-S-RR is a game changer with suppressors, it’s like a having a muzzle brake but actually hearing safe. My goal weight is 9 pounds. My 300wm with same bullet weighs 8 pounds and I don’t have any issue spotting impact with the new can. Now when I was running an Ultra 7, it jumped so much I couldn’t see anything.

 

[JAC8504]

Interesting. I have a magnus k on order

 

[JM151]

Interesting. I have a magnus k on order

did you get the RR?

 

[JAC8504]

did you get the RR?

Nope. I got the non RR. I was going for the smallest form factor

 

[JAC8504]

Oh… I am a huge fan of .338 for hunting purposes. I have .338 federal, 338WM, 338 lapua. I’d like a 338 ARC.

I wish there was a 338PRC and have thought about the 338RPM. Not quite sure though. But I have basically the same aspirations of a backpack build to do it all