That was excellent. Thanks!

Slow MO cameras do show some very interesting effects

Looks like an AHR rifle to me. Anyone know?

Love the way the block sucked the muzzle flash into it as the temporary wound channel contracted again.

Fascinating! Have to admire the gentleman who served as the recoil guinea pig.

The trex is an AA coilchunk original -
KentuckyBallistics has 375. 458 lott, a 470 NE, 500Ne, 577 trex, 600ne, a 700 NE, and single shot 4 bore

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Looks like an AHR rifle to me. Anyone know?

Yeah, it's one of ours. GMA action and 20" barrel.

Yikes that floorplate!

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Yikes that floorplate!

Yeah, like the guy in the video said, it's a design flaw. Inside-the-bow flooplate releases do not belong on big bores, but that's what comes on GMA's. I've been trying to get Scott to send me the bottom metal so I can lock the release down. The button type releases like on CZ's and Winchesters are the best type of release for any caliber really.

Fascinating footage! Thanks for posting.

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Originally posted by Bitterroot:

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Yikes that floorplate!

Yeah, like the guy in the video said, it's a design flaw. Inside-the-bow flooplate releases do not belong on big bores, but that's what comes on GMA's. I've been trying to get Scott to send me the bottom metal so I can lock the release down. The button type releases like on CZ's and Winchesters are the best type of release for any caliber really.

Do a frame by frame view of the slow mo and the magazine floorplate opens with the guys finger nowhere near the button in the bow. His finger stays up high in the trigger bow not low where it would need to be to hit the mag release button. The way to check this would be to put some red paint on the back of the guys finger and see if it transfers to the mag release button.

Yes a design flaw, too weak a spring for the mag release. That's what it looks like to me anyway?

PS: had the guys finger hit the mag release button hard enough to release the mag floor plate I'm sure he would have been howling some with a sore or broken finger, takes a lot of pressure with the back of your finger to operate that button.

4bore vs 800 lb ballistics gel
https://www.youtube.com/watch?v=QA9bOldHoeY

Yup. Not finger related. The flex in the system springs it open.

I am by no means an expert of any kind but I like to learn from those who are.

Gun builder D’Arcy Echols has designed his own bottom metal for the rifles he builds. One of the critical aspects in building a reliable big bore rifle is a floor plate that does not open under heavy recoil. Hence he figured out how to engineer the mating surfaces of the floor plate release latch so that they are not affected by the forces of recoil. When done correctly there is actually no need for any spring tension at all to keep the floor plate from opening.

Shown here in a short video clip.

https://youtu.be/FGKLGZ0Z2Zs

Thanks, That is informative and fun . Brian

That gold 500... Looks like a wealthy pimp decided to go on safari & have a double made for the purpose... Beauty is in the eye of the beholder, I guess...

Some very cool slow-mo footage.

We often shoot gallon jugs of water when practicing with big bores. The violent explosions are fun, and we often find water quite far from the impact site. Seeing it in super slow-mo is neat & well worth the watch.

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Originally posted by Klein:
I am by no means an expert of any kind but I like to learn from those who are.

Gun builder D’Arcy Echols has designed his own bottom metal for the rifles he builds. One of the critical aspects in building a reliable big bore rifle is a floor plate that does not open under heavy recoil. Hence he figured out how to engineer the mating surfaces of the floor plate release latch so that they are not affected by the forces of recoil. When done correctly there is actually no need for any spring tension at all to keep the floor plate from opening.

Shown here in a short video clip.

https://youtu.be/FGKLGZ0Z2Zs

Interesing and well done...but...IF recoil forces drive the finger into the latch, the result is that the magazine contents still fall out.

Here's a true story: Client was wandering about in buff teritory, "just looking" Brush exploded and he's about to be flattened, he got off one shot from the hip (See where that puts your trigger finger!!!) Yes....magazine vomited!...even with one hell of a strong spring

Lucky Guy!


I really believe the latch thumb portion could just be eliminated and rely on some pointy tool to open the floor plate for cleaning, etc.

OR..with .a little thuoght one could time a reduced exposure to be final opening with the case rim....1909 Argentine release is a good example of noodling it out



True sopry" Cient was :nlyu looking

My Oberndorf Sporter Mauser 404 arrived from Rhodesia back in '77 with the magazine floor plate epoxy glued shut. The mag release button in the trigger bow had a good strong spring and after cutting open the glued floor plate and removing the glue the plate has never opened on me in use. The issue of mag floor plates opening when on safari in Africa was written about back in the day and some did glue or fix floor plates to ensure they did not open, either due to a mechanical problem or a user problem.
I did read somewhere that a famous American film star accidentally opened his rifle floor plate dumping all his cartridges when facing a charge. Another worked the bolt back and forward without firing a shot, again dumping all his rounds, while in a tricky situation.

I agree 100% that for big kickers the Winchester Model 70 and CZ 550 floorplate release latches cannot be rivaled, much less beaten.