Thread: 7mm RM rechambering

Originally Posted by Stocky

Make sure you remember to make sure the thraoting is too suit the shorter tikka magazines. Ask Greg I'm sure he will have specs.

@Stocky thanks mate yeah will do, have had a good look around and found that there has been two revisions of the CIP standard reamer, Rev B has a freebore measurement of .3645", whereas the original freebore of Rev A was .0631". I’ll confirm what I need with Greg.

I've read most of the thread and hope.i havent missed this, as the rifle is you should be able to get the 162s to around 3050 fps, with running those numbers how much more are you after from your rifle?

You’re quite right, the 162gr eldx is great and comfortably gets me to 1000 yards. I ran a ladder test last week, and although the chrono was on the blink it looked like my top accuracy node was only 2920, which isn’t quite there. The goal, and that’s it a goal, would be to have a cartridge/rig capable of 1 mile on steel, and enough energy to take an animal at 1Km. With some great advice, I’m going to work up a load seated out to the lands (a couple possibles I’m working on) and single load to see if it’s worth taking the step up.

thought about 7mm blaser magnum? mag feed easy in the tikka ditches the belt and performs beauty brass is easy to come by im doing 3060fps 175 eldx less powder than my old RM and quicker

Originally Posted by Grimus

OK, so this is a total pipe dream at this stage, but I’m looking at re-chambering my Tikka 7RM. I’m looking at 7-375 Ruger, or possibly 7-300 PRC.
The thought behind it is, I want to keep it mag feed-able, drop the belt, and increase range.

First question, can anyone recommend a decent smith for re-chambering? And also dies etc
Second question, has anyone got these calibres, and what are positives vs negatives of each.

Thanks in advance for any insights

Originally Posted by Kelton

thought about 7mm blaser magnum? mag feed easy in the tikka ditches the belt and performs beauty brass is easy to come by im doing 3060fps 175 eldx less powder than my old RM and quicker

Yeah, others have suggested 7BM too, and eventually that’s the plan, and absolutely ticks all the boxes

I would go 7BM ratter that RM if I was to build another too.

Originally Posted by 57jl

the 8x68s case is a really strong non belted case you could neck down

The BOO BOO series of cartridges!!!

Spoke to Tracy at Deadeye, he suggested 7 LRM as a straight rechamber. $350 to rechamber, $200 for dies and $3 a pice for the brass. So for $1000 I could fit the atlasworx DBM and ASICS mags (to run max 3.6” COAL), have the work done and 50 brass. Sounds like a great cartridge, has slightly more capacity than the 7 BM, and a long neck. I understand that the brass wasn't the best, is this still the case? Is there any one out there with this cartridge that can give some real world velocities, and loads?

IIRC, brass is made by Hornady and is reputed to be poor quality. It’s a good cartridge in theory but has largely failed to gain traction due to poor brass quality.

Work out which projectile and velocity is required to get the job done

Make sure your chosen chambering has the best quality brass

To be effective past 1000yards use the best components made

Then for the next year be prepared to be schooled by the wind