30-378 WBY Mag vs 300 Norma Mag In a matching custom barrels ,for long range shooting,which cartridge is best ?
30-378 WBY Mag vs 300 Norma Mag
- Thread starter Ironworker
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imho, belts are for holding your pants up. It's another production tolerance to try and quantify. As recent designs have surfaced, the useless of the belt has been dealt with. I have a 300 WM, and iirc, the SAAMI specs say +/- .002" tolerance from the base of the case to the front of the belt.
Belted cases can shoot as accurate as rimless ones if they headspace on their shoulders. Full length sized fired cases with .002" shoulder bump makes belted cases headspace on their shoulders.
Belt headspacing tolerances are SAAMI spec'd -6 to -8 thousandths spread.
If you'll shoulder the rifle shooting it, the one with the least recoil will typically be most accurate.
I think the 30-378 gets about 600 rounds of best accuracy.
Belt headspacing tolerances are SAAMI spec'd -6 to -8 thousandths spread.
If you'll shoulder the rifle shooting it, the one with the least recoil will typically be most accurate.
I think the 30-378 gets about 600 rounds of best accuracy.
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I disagree with this. Some of this most accurate guns are the heavy guns of 1000 yard BR. Some weigh so much and have brakes so recoil and tracking are not relevant. The belted MAGS have disappeared almost completely. There is a reason for that. The 300 WSM case just plain down outshoots them. Also the 6 Dasher wins alot but it has to do more with accuracy and not recoil. Like i said, an 65 to 100 pound gun with a brake takes the recoil amd tracking factor away. Matt
Are those big guns fired without artificial support?
What's the size of the biggest single 10 shot groups in their record setting aggregates?
It doesn't matter what it is fired off of. It matters the cartridge and accuracy. The 300 WIN, the 308 Baer and the 300 Weatherby were king 10 years ago. They shot in these same guns and rests. Now there are almost none. Like i said, they disappeared for a reason. The biggest group in an 10 match agg is around 6 inches. The range is tough and you won't shoot shoot smaller with anything else. Guys came here and tried including military rifle teams. Matt
dmoran
Donovan Moran
What's the size of the biggest 30-shot test group from your 30-338 (the one that you claim averages less then 6" for 30-shots at 1000yds)?
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What about the recoil that moves the barrel axis before bullets exit? Brakes work after bullet exit.
All aggs or just the record ones? Some agg records are almost 6 inches. And all the other aggs are bigger. Each agg record is the smallest one fired for that event
About 5 inches.
LA50SHOOTER
Sworn To Protect The Constitution.
Show us a Target !! (Please)
dmoran
Donovan Moran
Funny how your bullets, ammo, and equipment used were so accurate all those years ago. With averages smaller then the current World record 20-shot F-Class targets, and more capable then any 1000-BR setup in the same era's. And kind of weird how when you did take your 30-338 to a 1000-BR match that one time at CRC, your smallest/best group was a mid-12" for only 10-shots.
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Not weird at all considering no artificial support was used slung up in prone.
No way. Donovan will throw a tantrum and hurt himself.
dmoran
Donovan Moran
No you didn't shoot slung up.... in Benchrest you have to shoot from sand bags. It's a rule and always has been.
And here is a direct quote of yours from a couple years ago, your telling of the setup you used:
And when I looked up the actual NBRSA results from the match, your smallest/best was a mid-12" and the other targets were much bigger. You got beat pretty bad finishing back in the pack.
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My plan worked. I made you reveal reality. That's a 10 shot group. My 30 shot one was about 5 inches in a more stable position for me.
My point is, benchrest rifle accuracy average is larger than what records show. It's rarely mentioned. The biggest groups are usually kept secret. I'm done here.
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dmoran
Donovan Moran
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We only shoot one target per event. That makes aggs harder, 10 matches over a six month period. I gave an example, same guns just different chambers. The beltless cases dominate now. Matt
Ok 300 Norma Mag wins . What twist if I want to shoot the heavies ?
6MMsteve
Gold $$ Contributor
I was told back in 1986 by Fritz Gobbelr not to come to Pa 1000 unless your gun shot under 7in ....wrong then...... but these days yes it better shoot under 7 or you will go home crying lol ...................... EDIT I picked a name from gun digest and started calling and finally got this guy to answer Joe Doebbler or something like that, that was the only way to commmunicate back in the day
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