7mm build

[highdrum]

I know! My other 7-300s were on Benchmark and Bartlien, and accuracy on those always settled in about 3000fps @ 66.8 - 67.4grs of H1000, hitting pressure @ 3100ish. I don't know why my proof barrels always seem to do the same speed or more with less powder and have a higher pressure threshold, but they always do. So I keep buying them

Most proofs are 4 land rifling, vs the 5 of most competitors, could be the difference. My 7 lrm barrel is bout to go in the scrap heap. I'm trying to decide between 28 nosler, 7mm blaser(improved maybe) and 7/300wsm. 28 nos is a bit overbore, however it lasts as hunting rig.

 

[clownbuster]

Any of those should be great.

 

[Wedgy]

67.0gr H1000 under a 180 nets you 3200+? ****.
My 7RM only gets 2996fps from 69.0gr H1000 w. 180 Hybrids from a 26" Bartlein. I got up to 3080fps w. 71gr H1000, but the accuracy was at 2996fps.
89.0gr of RL33 only got me 3190fps w. a 184 Hybrid from a 28 Nosler.

This is from the 7mm Sherman Short thread;

"A 195 eol with 59 gr of R26 which was great on accuracy was pushing past 2900 fps. The ones i tested averaged around 2920-2930. The temperature was around 65 degrees. I didn't hit major pressure signs till around 61.5 to 62 gr of powder. This is a 28 inch krieger."
https://www.longrangehunting.com/threads/7mm-sherman-short-pet-loads.171534/

 

[clownbuster]

This is from the 7mm Sherman Short thread;

"A 195 eol with 59 gr of R26 which was great on accuracy was pushing past 2900 fps. The ones i tested averaged around 2920-2930. The temperature was around 65 degrees. I didn't hit major pressure signs till around 61.5 to 62 gr of powder. This is a 28 inch krieger."
https://www.longrangehunting.com/threads/7mm-sherman-short-pet-loads.171534/

YUMMY! I've always wanted to try a 7SS in a Titanium medium or long action.

 

[Wedgy]

YUMMY! I've always wanted to try a 7SS in a Titanium medium or long action.

Why on a long action ?
The idea of the Sherman is that it is a true short action length round, even with the big heavies.

 

[clownbuster]

Why on a long action ?
The idea of the Sherman is that it is a true short action length round, even with the big heavies.

Right, sorry, my mind gets stuck in WSM and SAUM land...and I've rarely seen a short action feed the short fatties with steep shoulders really well. But, sounds like that's not an issue here with this caliber

 

[highdrum]

Right, sorry, my mind gets stuck in WSM and SAUM land...and I've rarely seen a short action feed the short fatties with steep shoulders really well. But, sounds like that's not an issue here with this caliber

If you run the Sherman short cases on a short action with the long heavy bullets, it's still crowding powder below 2.9" oal. Best action for the Sherman short is an intermediate or Tikka t3 length action

 

[lancetkenyon]

This is from the 7mm Sherman Short thread;

"A 195 eol with 59 gr of R26 which was great on accuracy was pushing past 2900 fps. The ones i tested averaged around 2920-2930. The temperature was around 65 degrees. I didn't hit major pressure signs till around 61.5 to 62 gr of powder. This is a 28 inch krieger."
https://www.longrangehunting.com/threads/7mm-sherman-short-pet-loads.171534/

Comparing RL26 to H1000 is apples to oranges.....or 69 Vette to 69 Beetle.

 

[MudRunner2005]

If you run the Sherman short cases on a short action with the long heavy bullets, it's still crowding powder below 2.9" oal. Best action for the Sherman short is an intermediate or Tikka t3 length action

Or a Rem 700. If I'm not mistaken, I think Rich said once that he used the stock factory 700 SA mag box as his length parameter for the SS cartridges. Don't quote me on that, but I think I remember him either telling me that once in a conversation, or he said it in a post here on the forum...

 

[Capt RB]

If you run the Sherman short cases on a short action with the long heavy bullets, it's still crowding powder below 2.9" oal. Best action for the Sherman short is an intermediate or Tikka t3 length action

I could run 2.97+ in my savage mags. If you single feed you can eject 3.12 but that's about it. Remington isn't that much but I haven't measured it to give a comparison. My 308 runs at 2.810-2.8125 depending on the lot I'm loading.

 

[Wedgy]

Comparing RL26 to H1000 is apples to oranges.....or 69 Vette to 69 Beetle.

Wow, your 7RM is a real shooter !
Reloder 26 is stable until ~84F then not so much(in my experience)....which is why I mostly use H1000, Retumbo, H4350, etc because it gets HOT here in summer, but if you shoot & hunt in a cooler temp range it is a great choice for many and gives some huge velocity gains.

PS my 1957 bug ran low 12's ...obviously not stock.

 

[lancetkenyon]

Wow, your 7RM is a real shooter !
Reloder 26 is stable until ~84F then not so much(in my experience)....which is why I mostly use H1000, Retumbo, H4350, etc because it gets HOT here in summer, but if you shoot & hunt in a cooler temp range it is a great choice for many and gives some huge velocity gains.

PS my 1957 bug ran low 12's ...obviously not stock.

I found the same temperature threshold for my 6.5SS using RL26 under 150 SMKs. So I too, worked up a load w. H1000.

 

[ThorThor]

I have a 7mm Rum and love it. 27 inch Schneider barrel 1/8 twist shooting the 195 EOL a little over 3100. Shoots a solid 1/2 Moa. No I don't shoot it a lot, but it is THE rifle I own that gets taken if game might be over 400/500 yards. if you can range it you can kill it ( within reason ). If I were shooting more than 20 rounds every few months I would do something smaller however.

 

[j31968]

I will throw in a vote for a 7mm practical or the slightly improved 7mm Rogue for shooting the heavies. They both run just shy of a STW. And 300 WM bras is a dime a dozen and easy to find. However I built my Rogue just before the 28 nosler came out. Had it arrived prior to the build I may have went that way.