I shoot a 11# 300nm imp, it's a hunting rifle. It suppressed with dead air lti XC, it's not too bad at all. Big can, still lots of push and no chance of spotting shots unless I'm on low mag and targets are past 400y. You're shooting an ELR cartridge, there's gonna be pros/cons. Maybe the 50cal tbac can might calm it down to 308 like recoil, but there is no free lunch here.
I understand that and yeah I can shoot it no worries but putting 75 rds in 1 day at a match the brake is better. That's all I was saying. Think the bigger can would be better for the 300 norma
This is where I'm at now! My inner old man is coming through!
How long did you load those rounds? Or I guess a better question would be when do they hit rifling in that barrel?
With a 245? Best I can do is 2895 with a 230 in my AI factory-barrel 300PRC. I can manage about the same (2900) with a 245 in the factory 300NM barrel, and it's on the hot side. Tell us more about your 300PRC load.
Na 230 didn't remember his post earlier he was asking 245 loads. But I def run my prc about the same 2900. I can get 2950 it's pushing it. 79 gr of retumbo iirm will have to check my notes later.
You can definitely push them hard and get some crazy speeds. N570 you can get almost 3100. I don't push things I run at lower pressure to balance everything out. I can get 3000 with my n568 but didn't see the reason for an extra 80 feet
I ran 230 at 3080 from a 26" 9tw w/ N570. 215s at 3190, same powder. Barrel had over 900rd on it when it would no longer hold a 5 shot group w/o a flyer. This was a 33° imp barrel.
Ok. I'm running 78.1gr Retumbo in the PRC with the 230, and 81.0gr in the Norma (not Improved) with the 245, both are 27" AI barrels.
Sir this is snipers hide.... We start at overpressure get those rookie numbers up
The way I look at it is find what your happy with. Most people like above are shocked at what I run my 245s at in the improved but from 2925 to 3000 it's the same wind hold I would have to move to 3050 plus to get an advantage in wind according to the ballistics calators. So I find the best overall load for everything
Virgin brass, first shots through this barrel. Haven’t run through sizing yet. I’ve never sized lapua brass first firing.
Virgin brass, very common to see ejector shadows from the case expanding to the chamber for first firing. Get everything formed, and that'll not happen anymore. Lapua brass is quite short to the Norma go gauge.
Are you getting any bolt lift or any other traditional psi sign? How much is the shoulder moving forward from virgin to once fired? If the shoulder is moving a lot, that'll cause the ejector mark and flat-ish primers. Size 5 cases 002 bump(if it's needed) maybe less. And go shoot them same charge weight. If it has pressure, back it off. Let the rifle tell you. Lapua 300 norma brass is tough shit, reading the case head is prob a bit too late and pressures are already very high by that point.
All the book loads for the NM seem very low. My NM with the 245gr Bergers is 89gr n570 going at 3006 FPS through a recut freebore 26" Proof.
Yes,I have to remove the donuts by turning the shoulder/neck area after 4 to 7 reloading .
I used H1000 today with 245 grain Berger at 77.86 grains I averaged 2770 FPS with a SD of .850. I’m not sure how people are getting 3000 fps without issues. I got max fps from quick load as 2746 for 245 grain.
H1000 is good for 215s in the NM and NMimp, however once you start getting to the 230-250gr bullets, several powders will outperform velocity wise.
H1000 burn rate is too fast to be optimal for the 245 in 300NM. I'm getting 2900fps from 81.0gr of Retumbo and Fed 215M primers (27 in. factory AI barrel), with very good ES/SD. I expect N568 would be very similar. N570 will do even better, but it is notorious for burning out barrels prematurely, and 300NM is already a barrel burner to begin with, so I'm not willing to go there. I'd try Retumbo or N568 and you should be much happier. Or, go with N570 and live large if you're OK with the short barrel life.
I have some dies from RCBS for my Grendel that require 2 turns past it hitting the shell holder.
Keep screwing it in til you can get your shoulder bump. I've also have had to grind a shell holder down to get the proper shoulder bump.
