Mossberg 500 .410 bore Dia.

Talk about 20 28 gauge & .410 bore shotguns here.
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bullethead
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Joined: July 11th, 2012, 9:09 pm
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Mossberg 500 .410 bore Dia.

Post by bullethead »

Has anyone measured the bore diameter on a Moss 500 .410 with a fixed full choke?
I am getting .389 which is .021 restriction. That is even a bit tighter than "full".
Im curious to see if they tend to run tighter.

Thanks in advance.
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VALongbeard
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Joined: April 22nd, 2012, 3:19 pm

Re: Mossberg 500 .410 bore Dia.

Post by VALongbeard »

I'm pretty sure Mossberg cuts their barrels at a true .410. I read somewhere where that was measured to be what they were, can't remember right off though.

I know Remingtons nominal bore is actually .415, but I am 99 percent sure Mossberg is .410.
bullethead
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Location: Schuylkill Co. Pa.

Re: Mossberg 500 .410 bore Dia.

Post by bullethead »

VALongbeard wrote: April 21st, 2018, 11:49 pm I'm pretty sure Mossberg cuts their barrels at a true .410. I read somewhere where that was measured to be what they were, can't remember right off though.

I know Remingtons nominal bore is actually .415, but I am 99 percent sure Mossberg is .410.
Thanks VA.
I am wondering if their fixed Full choke is a little tighter than normal.
.015-.017 would be more normal Full constrictions.
.021 is a really tight Full/ Xtra Full.

Hopefully some others who have Mossbergs can check what their exit diameter is.
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VALongbeard
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Re: Mossberg 500 .410 bore Dia.

Post by VALongbeard »

I have come to the conclusion it all depends on what day the gun was built.....HaHa! There is definitely variation in the fixed choke system, regardless of manufacturer. My local gunsmith has a Mossberg model 500 .410 and his measured .389 if I remember correctly.

This will put this into perspective comparing yours to mine.

Mossberg model 500 .410
.410 nominal, choke .389, constriction. 021

Remington model 870 .410
.415 nominal, choke .391, constriction .024

Not a heck of a lot of difference. Some, but not extreme. I'm sure barrel length is about the same. Mine is 25 inches. My suggestion for you, try TSS 9s first. The TSS 10s like more choke, I know I don't have enough choke for them. They need easily another 5 to 8 thousandeths in my gun I believe. Just some friendly advice for you. I think your gun will do good with 9s, just a hunch I have. Hope this helps.
bullethead
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Location: Schuylkill Co. Pa.

Re: Mossberg 500 .410 bore Dia.

Post by bullethead »

I did shoot some T9 today.
13/16oz
I used some buffer and the load patterned very evenly.
It put 133 in a 12"x12" square at 40yds. Very evenly spaced. The T9.5 (no buffer) did 140s in the same 12"x12".

I cant resize my pics to allow them to load here.
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VALongbeard
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Re: Mossberg 500 .410 bore Dia.

Post by VALongbeard »

Sounds solid to me! Would love to see the pics if you can get them to load up.
bullethead
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Re: Mossberg 500 .410 bore Dia.

Post by bullethead »

I sent you a PM Va.
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VALongbeard
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Re: Mossberg 500 .410 bore Dia.

Post by VALongbeard »

Here are the pics.....
Attachments
Tss bullethead 3.jpeg
Tss bullethead 2.jpeg
Tss bullethead 1.jpeg
bullethead
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Re: Mossberg 500 .410 bore Dia.

Post by bullethead »

Many thanks VA!
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VALongbeard
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Re: Mossberg 500 .410 bore Dia.

Post by VALongbeard »

Glad to help!
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GLS
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Re: Mossberg 500 .410 bore Dia.

Post by GLS »

I saw no difference in Hal's 13/16 oz. load with or without buffer as I tried to make a factory full .410 shoot better. As for a 12" x 12" count opposed to a 10" circle count the 12"x 12" is a 144 square inches as opposed to a 10" circle's 78.5 square inches. The point being an evenly distributed 140 pellets in a 12" x 12" square would have the same pellet density as 76 pellets evenly distributed in a 10" circle and the reliable range for turkey hunting for the square's count would be more limited that 140 pellets in a 10" circle at the same distance. The cut off of 100 pellets in the 10" being the demarcation of reliable killing range may be "overkill" or an arbitrary figure, but that's where most draw the line. It would seem that a pellet count of almost 1 per square inch would be bound to strike vitals more than with one pellet, but more density is obviously better. The gun that I tried to improve pellet count by adding buffer was giving me 70-75 in the 10 ring with the factory full. It was improved considerably after Sumtoy choked it which gave almost twice the density with the same pellet size and has gone on to build a growing stack of prone gobblers. Gil
bullethead
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Re: Mossberg 500 .410 bore Dia.

Post by bullethead »

GLS wrote: April 23rd, 2018, 5:50 am I saw no difference in Hal's 13/16 oz. load with or without buffer as I tried to make a factory full .410 shoot better. As for a 12" x 12" count opposed to a 10" circle count the 12"x 12" is a 144 square inches as opposed to a 10" circle's 78.5 square inches. The point being an evenly distributed 140 pellets in a 12" x 12" square would have the same pellet density as 76 pellets evenly distributed in a 10" circle and the reliable range for turkey hunting for the square's count would be more limited that 140 pellets in a 10" circle at the same distance. The cut off of 100 pellets in the 10" being the demarcation of reliable killing range may be "overkill" or an arbitrary figure, but that's where most draw the line. It would seem that a pellet count of almost 1 per square inch would be bound to strike vitals more than with one pellet, but more density is obviously better. The gun that I tried to improve pellet count by adding buffer was giving me 70-75 in the 10 ring with the factory full. It was improved considerably after Sumtoy choked it which gave almost twice the density with the same pellet size and has gone on to build a growing stack of prone gobblers. Gil
All very true regarding the 10"circle vs 12"x12" square inches. But while being a pattern junkie from WAY back and obsessing over 10" pellet counts, I have also found that only the pellets that hit a turkeys vitals in the head, neck and body actually count. The pellets above, below and on either side of the head/neck(mainly) and body(secondary) that do not land and hit vitals do nothing.
That is not to say I would not be thrilled with more hits on a 10" circle or 12"x12" target, but that .410 pattern is consistently as good as every single factory Lead 12ga turkey load and Lead Handload that I ever fired before I got into loading my own HeviShot and Tungsten. And gobblers died quite well "back in the day".

I have fired a few dozen 13/16 T9 and T9.5 shells at 40yd targets. In each case I am able to take a life sized turkey head pic(from a target) and move it around within 8 to 10 inches of the center of the pattern and get multiple vital strikes to the point where I am confident that gun and load will kill reliably up to 40yds. It does very well in an 8" circle around the point of aim with non buffered loads. It also has shown me that at the point of aim it puts enough pellets where needed. I absolutely plan on having a gobbler closer than 40yds when I pull the trigger, but 40yds will be my limit.

I tried buffer and no buffer. The buffered loads with T9 seemed to eliminate clumping of pellets but also gave a less dense 8"center core.
The un-buffered T9.5 give a more dense 8 and 10 inch circle numbers and above to well above the 100/10/40 standard.

I will try T10s before next spring.
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GLS
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Re: Mossberg 500 .410 bore Dia.

Post by GLS »

bullethead,
When I was zeroing in my .410 a few years ago I decided to use some holdover #8 TSS from the days when we weren't sold on #9's effectiveness. I wasn't expecting good density and I was surprised to see a shot count of 120 in the 10 ring at 40. As was pointed out by others, the larger shot tends to hold center density better than the smaller. Before the discovery of electricity when I was loading for 10 gauge, the concern back then was number of shot in a 30" circle at 40 yards. My how things have changed....
Gil
bullethead
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Joined: July 11th, 2012, 9:09 pm
Location: Schuylkill Co. Pa.

Re: Mossberg 500 .410 bore Dia.

Post by bullethead »

GLS wrote: April 23rd, 2018, 10:06 am bullethead,
When I was zeroing in my .410 a few years ago I decided to use some holdover #8 TSS from the days when we weren't sold on #9's effectiveness. I wasn't expecting good density and I was surprised to see a shot count of 120 in the 10 ring at 40. As was pointed out by others, the larger shot tends to hold center density better than the smaller. Before the discovery of electricity when I was loading for 10 gauge, the concern back then was number of shot in a 30" circle at 40 yards. My how things have changed....
Gil
Good info. It reinforces the advice that says the only to know for sure what a gun/load/choke will do is to SHOOT it!
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