I'm running a 9 twist Pacnor. 208 A-MAX at 3100 fps, 28" bbl.
Ideal twist? I don't know, but I would rather have one too fast as opposed too slow.
Ideal twist? I don't know, but I would rather have one too fast as opposed too slow.
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What are ya'll trimming your brass too?
Mike
Sent from my C771 using Tapatalk 2
Updates ? ,particularly with RL-33 powder?
Would love to see pics of this gun.Just took mine to the range for the first time. Still single feeding it as I've yet to open up the feed rails to allow the fatter case to be pushed into the BDL mag box... Just did a ladder test with 2 rounds of each powder charge from 86-89.5 grains of retumbo with the 215 Berger Hybrids. Seating depth was 2.670" measured from the Ogive. It was 95* today with zero humidity and I was able to run up to the 90.5 grains but was seeing a pretty flat primer and slight extractor mark, I'll be running 89 grains of Retumbo and will play with seating depth. Barrel really settled in after 5-6 shots and I had five consecutive shots of 87.5, 88, 88, 88.5, 88.5 all in the same hole with one flyer. .35 MOA group and that's not even tuning seating depth.
Hopefully will play with seating depth and get 'er tuned up a bit more and send some rounds over the chrono. Hoping for 3100+ out of a 27" 1:10" twist Rock Creek cut rifled... This thing is going to be stupid accurate I can tell you that!
Mike
That is a fine looking stick! Is that a remmy action or a custom? What is the OAL will it fit in a standard long action or be better in a cip?
Anybody got a measurement on their feedrail widths to fit this case? I'm not even sure what caliber this action started out as, I got it in trade for some other parts. Thanks!
Mike
Sent from my C771 using Tapatalk 2
Hi HellsCanyonArmory, my McMillan MCRT Outdoorsman started life as a .338 Lapua and has now been re-barrelled as the .300 Norma. It feeds perfectly as the bolt face diameter is the same for both cartridges. The dimensions are as follows for a trap door style, off set double stack type magazine well. Rear rail aperture is 0.5835”. This dimension extends parallel for 1.5000” from the rear of the magazine well. The aperture opens up at that point to 0.7520” and extends parallel to the chamber / end of the action. The magazine well measures 3.6670” from rear to front – the bolt throw is much longer than this. Hope this helps, keep us posted, regards from the UK.
Is Ramshot considered a temperature stable powder? I have been running H1000 and have traded for some Ramshot. Just curious, I am sorry for changing the subject but was glad to see you were having luck with it.
Is it possible to build a 300 NM with a Surgeon 1086R action?
I think a custom bolt might be in order.
300 Norma Magnum - Norma
Factory ammunition with 230 gr Berger hybrid target @ 910mps / 2985fps
McCourt Munitions loaded up some 230 Bergers for me with the following numbers:
Vel 2997
ES 7
SD 3
Very accurate load. Recoil is noticeably less than the previous Retumbo load - but just as fast - and more accurate. Easier on the brass, too. You would not believe what powder he's using.
I am a young shooter interested in building a .300 norma mag off of a 700 action, is this able to be done? what caliber of 700 would I need to buy to be able to rebarrel for the .300 norma magnum?
also, do you think it is worth me trying the 215Hybrid or the 230Hybrid in a 10.92tw cut Rock at 26", will they stabalize?
All Rock barrels have a .5-.7 gain twist so your looking at 10.22-10.42 twist at the muzzle. At the speeds this cartridge is capable of, I think you'll be ok.