pondskipper
Well-Known Member
- Joined
- Aug 23, 2010
- Messages
- 296
If it's temp stability and accuracy you are after then H1000 or 4831sc Are definitely going to be your answer and In that order!
7mm Reg Mag Frustrations
- Thread starter TexasTB
- Start date
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MudRunner2005
Well-Known Member
Temp tolerance is important, give IMR 7977 a try. It's one of their new Enduron powders that are temp stable. I have not had good stability with any of the RL powders I've tried.
Don't give up on the Bergers, try them between 0.015" and 0.025" seating depth. I seat almost all mine at 0.015".
A few posters mentioned the rifle or mounts. The rifle must be absolutely sound first. I have encountered quite a few custom rifles that had issues when delivered. I finally made a list to remind me of things to check to ensure the rifle is sound.
rifles with blind hole like a Ruger check front action screw hole in bottom for epoxy
Action screw bottoming out in blind hole
Leupold windage style base windage side screws not tight
Ruger rings not in recesses
Forward screw of front base touching threads of barrel shank this could pertain to your rifle
Poor crown, optimal way is to check with bore scope
Action screw holes in stock too small, drill larger so sides of action screw won't touch
Bolt handle touching stock
Mag box must not bind
Recoil lug making early contact in bottom of bedding (rocking action)
Trigger group must not touch stock
Trigger guard must not touch trigger
Uneven bedding--- tightening one action screw to see if the action pulls up at other end.
Action screws properly torqued
Barrel having adequate clearance where it is supposed to be floated
Clean bore
This will give you some things to check before trying other loads.
Ross
rifles with blind hole like a Ruger check front action screw hole in bottom for epoxy
Action screw bottoming out in blind hole
Leupold windage style base windage side screws not tight
Ruger rings not in recesses
Forward screw of front base touching threads of barrel shank this could pertain to your rifle
Poor crown, optimal way is to check with bore scope
Action screw holes in stock too small, drill larger so sides of action screw won't touch
Bolt handle touching stock
Mag box must not bind
Recoil lug making early contact in bottom of bedding (rocking action)
Trigger group must not touch stock
Trigger guard must not touch trigger
Uneven bedding--- tightening one action screw to see if the action pulls up at other end.
Action screws properly torqued
Barrel having adequate clearance where it is supposed to be floated
Clean bore
This will give you some things to check before trying other loads.
Ross
gohring3006
Well-Known Member
This is likely one of your problems. I have a hard time believing a semi custom rifle with a good barrel won't show any promise with several load weights. I do know some rifles absolutely hate certain powder for no apparent reason.
Elk Hunter 338
Official LRH Sponsor
well to start i read that your .050" off the lands with 180 VLD's???? they are way more picky than the hybrids!!! start at lands hard touch and move back ill bet it will come in either at, or somewhere around .010" off they love to be "Right Tight" with the lands and id stay with retumbo that is my go to for the 7mag and the 180 bullets usually will run 3100 or dam close with single dig ES and 1/4 moa accuracy!!
but like all have said before strip the gun down and check all possibilities first then go back to range with some kissing the lands.
but like all have said before strip the gun down and check all possibilities first then go back to range with some kissing the lands.
Barrelnut
Well-Known Member
Are you 1000% sure the twist is 1:8.25??? Maybe is is really 1:9.25. Stuff happens. i would use the cleaning rod and patch method to verify the twist. That's really why I suggested the lighter bullet earlier. Even though the 175~180 bullets technically should run in the 9.25 twist, the heavies always grouped worse for me in my 7RM. To get it below 1~3/4 MOA, I would have to use something in the 160 range.
Good Luck.
Good Luck.
eshorebwhntr
Well-Known Member
Another vote for H1000 if retumbo didn't do well. They both should though. Had good luck with H1000 168 & 180 VLD.
I disagree that a 9.25 twist would make your accuracy go haywire. But likely your twist is what it's supposed to be at 8.25. I've regularly shot bullets that I was "undertwisted" for and made out well.
If you have a reliable chronograph maybe check your velocity for consistency. Maybe try the OCW method then tweak the seating depth. I've had 7mms that like VLDs .050 off the lands but most will make hay up near the lands around .010 jump.
Also agree with checking your gun over.
I disagree that a 9.25 twist would make your accuracy go haywire. But likely your twist is what it's supposed to be at 8.25. I've regularly shot bullets that I was "undertwisted" for and made out well.
If you have a reliable chronograph maybe check your velocity for consistency. Maybe try the OCW method then tweak the seating depth. I've had 7mms that like VLDs .050 off the lands but most will make hay up near the lands around .010 jump.
Also agree with checking your gun over.
LaHunter
Well-Known Member
Are you really getting 3100 fps with 180s in a 7 mm Rem mag? I get slightly faster than that with 160 grain AB. If I were to load them any hotter, I get pressure signs, so I am maxed out for my rifle.
I am using a different powder though, IMR 7828.
couesaddict
Well-Known Member
This is sound advise! With a magnum your shooting position and consistency vs accuracy is magnified vs smaller cartridges shooting lighter projectiles. I shot near half the life out of a light 300rum build looking for a really good load. I was shooting from a sitting position at a bench for most of it. Finally flopped down in the dirt with a bipod and rear bag then boom! Same load shooting 3/4 shot 1/4 repeatable. That is where I'm most consistent I've since learned. Others I'm sure are different. May not be the issue but it's something I don't think gets talked about enough
just country
Well-Known Member
morning, barnes bullets 168gr. 215 primers, 4831sc, long shot magnum
and MRP. I use these powders mentioned in my 7mmWbee
300win. and 340Wbee. H-1000 in my 257Wbee. GBOT TUM
and MRP. I use these powders mentioned in my 7mmWbee
300win. and 340Wbee. H-1000 in my 257Wbee. GBOT TUM
Elk Hunter 338
Official LRH Sponsor
yes accuracy node is usually between 3070-3100 .. this is in custom chambered rifles also with a lot benefiting them for more performance!
Jeffrthehunter
Well-Known Member
I just made the move from 175 ELD-X with H1000 to Nosler 160 AB and H4350. Went from over 1 moa to under 1/2 moa .
