Thread: 7mm RM rechambering

Originally Posted by Matt2308

Reading what you are trying to achieve, I’d suggest doing things properly the first time, probably saving yourself money in the long run and re-barrelling your T3 to 7 Blaser Magnum.

This gets rid of the belt and a 26” 1:8
7 Blaser will push the 180 ELD-M at well over 3050fps, these ballistics are VERY hard to beat in any other sensible cartridge combination.

IF you have the skill, it will also kill big bodied red deer at over 1000m and is very capable of hitting steel to well over a mile consistently.

I initially went the 28 Nosler route, had some fun and burnt through that barrel in 800 rounds, re-barrelled in 7BM and am very happy with the results.
It’s an excellent long range cartridge.

If you are happy to single feed, a real easy solution could be to just increase the throat length on your rifle while keeping it as a 7mm mag. Seat the projectiles way out, which will free up case capacity for more powder resulting in a bit of an increase in performance without expensive brass & without burning disproportionately more powder.
Once that barrel is toast and you have some practice under your belt then put together something that is a bit more niche. (specialty cartridge, faster twist /longer barrel)

I recently got a long throated 7mm mag put together. It got up to 309x fps without pressure signs shooting the 180ELDMs. It would have gone higher but that's where my ladder test that i'd loaded up stopped so have no data past that. It does have a 30inch long barrel though.
Just something to consider.

My long throated 7RM has a COAL of 91mm, which leaves around 2mm of space in the standard T3 magazine. 7BM would give you more still.

Originally Posted by Spitfire

My long throated 7RM has a COAL of 91mm, which leaves around 2mm of space in the standard T3 magazine. 7BM would give you more still.

Cancel that - absolute rubbish. Getting my rifles confused. It’s either impending senility or I have too many rifles.

Originally Posted by Spitfire

Cancel that - absolute rubbish. Getting my rifles confused. It’s either impending senility or I have too many rifles.

No worries mate, I figured you had made a mistake.