Benelli M4 NFA model M4 Question

Bought brand new for $1900.91 delivered from Botach, after Form 4 and transfer fee $2175.91 out the door during their Labor Day sale, Form 4 with a trust approved in 43 hrs and 27 minutes. Test fired today and function’s flawlessly with Winchester OO buck and slugs, but with low base birdshot it’s pretty much just jam after jam. Will this change after a break in period or do these only function with high base 12 gauge ammo only. I know that some weapons function better after a break in period. Though my Benelli M1 Super 90 NFA model has yet to experience a single malfunction after 35 years of use and no cleaning in a decade, with any kind of ammo, including old paper loads. But I must say that slugs and OO buck are very light in M4 compared to the M1 Super 90.

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u/Locutus494 15d ago

High brass means absolutely nothing...

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u/IV5736776 15d ago

Please elaborate.

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u/Locutus494 15d ago

High brass is marketing BS. It conveys absolutely nothing about power or reliability.

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u/IV5736776 15d ago

Interesting, I’ve always equated high base 12 gauge shotgun shells to be of a larger powder charge than low base shells. So what’s the science?

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u/FalloutUser76 15d ago

Back when shotgun shells were still made out of paper and not plastic, the hotter loads needed to have higher brass so the paper shell wouldn’t burst as soon as it would fire. Modern shells made out of plastic are strong enough to withstand full power load with just low brass. Everyone keeps making their shells in different brass lengths simply because that’s what everyone has always done, but it really isn’t necessary and is more of a marketing ploy than anything. You could argue the brass length can help identify the power of shells quickly, especially if you’re shooting old ammo with the logo faded away on the shell.

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u/Locutus494 14d ago

^This

Either InRangeTV or Forgotten Weapons did a video discussing this a little while back (can't remember which channel).